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[/] [hive/] [trunk/] [v01.10/] [boot_code/] [boot_code_v_branches.h] - Blame information for rev 10

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1 3 ericw 
/*
2 
--------------------------------------------------------------------------------
3 
 
4 
Module : boot_code.h
5 
 
6 
--------------------------------------------------------------------------------
7 
 
8 
Function:
9 
- Boot code for a processor core.
10 
 
11 
Instantiates:
12 
- Nothing.
13 
 
14 
Notes:
15 
- For testing (@ core.v):
16 
  CLR_BASE              = 'h0;
17 
  CLR_SPAN              = 2;  // gives 4 instructions
18 
  INTR_BASE             = 'h20;  // 'd32
19 
  INTR_SPAN             = 2;  // gives 4 instructions
20 
 
21 
 
22 
--------------------------------------------------------------------------------
23 
*/
24 
 
25 
        /*
26 
        -------------------------
27 
        -- external parameters --
28 
        -------------------------
29 
        */
30 
        `include "op_encode.h"
31 
        `include "reg_set_addr.h"
32 
 
33 
        /*
34 
        ------------------------------------------------------------
35 
        -- defines that make programming code more human readable --
36 
        ------------------------------------------------------------
37 
        */
38 
        `define s0                              2'd0
39 
        `define s1                              2'd1
40 
        `define s2                              2'd2
41 
        `define s3                              2'd3
42 
        `define _                               1'b0
43 
        `define P                               1'b1
44 
        //
45 
        `define op_rd_i         op_rd_i[9:4]
46 
        `define op_rd_ix                op_rd_ix[9:4]
47 
        //
48 
        `define op_jmp_iez      op_jmp_iez[9:5]
49 
        `define op_jmp_ilz      op_jmp_ilz[9:5]
50 
        `define op_jmp_ilez     op_jmp_ilez[9:5]
51 
        `define op_jmp_igz      op_jmp_igz[9:5]
52 
        `define op_jmp_igez     op_jmp_igez[9:5]
53 
        `define op_jmp_iglz     op_jmp_iglz[9:5]
54 
        `define op_jmp_i                op_jmp_i[9:5]
55 
        //
56 
        `define op_wr_i         op_wr_i[9:4]
57 
        `define op_wr_ix                op_wr_ix[9:4]
58 
        //
59 
        `define op_jmp_ie               op_jmp_ie[9:5]
60 
        `define op_jmp_il               op_jmp_il[9:5]
61 
        `define op_jmp_ile      op_jmp_ile[9:5]
62 
        `define op_jmp_iug      op_jmp_iug[9:5]
63 
        `define op_jmp_iuge     op_jmp_iuge[9:5]
64 
        `define op_jmp_igl      op_jmp_igl[9:5]
65 
        //
66 
        `define op_byt_i                op_byt_i[9:8]
67 
        //
68 
        `define op_shl_i                op_shl_i[9:6]
69 
        `define op_shl_iu               op_shl_iu[9:6]
70 
        `define op_add_i                op_add_i[9:6]
71 
 
72 
        /*
73 
        ----------------------------------------
74 
        -- initialize: fill with default data --
75 
        ----------------------------------------
76 
        */
77 
        integer i;
78 
 
79 
        initial begin
80 
 
81 
/*      // fill with nop (some compilers need this)
82 
        for ( i = 0; i < CAPACITY; i = i+1 ) begin
83 
                ram[i] = { op_nop, `_, `_, `s0, `s0 };
84 
        end
85 
*/
86 
 
87 
        /*
88 
        ---------------
89 
        -- boot code --
90 
        ---------------
91 
        */
92 
 
93 
 
94 
        // Thread 0 : test all jmp_i instructions
95 
        // Thread 1 : test all jmp instructions
96 
        // Thread 2 : test all gto instructions
97 
        // Other threads : do nothing, loop forever
98 
 
99 
        ///////////////
100 
        // clr space //
101 
        ///////////////
102 
 
103 
        i='h0;   ram[i] = {  op_lit_u,              `_, `_, `s0, `s1 };  // lit => s1
104 
        i=i+1;   ram[i] = 16'h040                                     ;  // addr
105 
        i=i+1;   ram[i] = {  op_gto,                `P, `_, `s1, `s0 };  // goto, pop s1 (addr)
106 
        //
107 
        i='h4;   ram[i] = {  op_lit_u,              `_, `_, `s0, `s1 };  // lit => s1
108 
        i=i+1;   ram[i] = 16'h044                                     ;  // addr
109 
        i=i+1;   ram[i] = {  op_gto,                `P, `_, `s1, `s0 };  // goto, pop s1 (addr)
110 
        //
111 
        i='h8;   ram[i] = {  op_lit_u,              `_, `_, `s0, `s1 };  // lit => s1
112 
        i=i+1;   ram[i] = 16'h048                                     ;  // addr
113 
        i=i+1;   ram[i] = {  op_gto,                `P, `_, `s1, `s0 };  // goto, pop s1 (addr)
114 
        //
115 
        i='hc;   ram[i] = { `op_jmp_i,       -5'h1, `_, `_, `s0, `s0 };  // loop forever
116 
        i=i+4;   ram[i] = { `op_jmp_i,       -5'h1, `_, `_, `s0, `s0 };  // loop forever
117 
        i=i+4;   ram[i] = { `op_jmp_i,       -5'h1, `_, `_, `s0, `s0 };  // loop forever
118 
        i=i+4;   ram[i] = { `op_jmp_i,       -5'h1, `_, `_, `s0, `s0 };  // loop forever
119 
        i=i+4;   ram[i] = { `op_jmp_i,       -5'h1, `_, `_, `s0, `s0 };  // loop forever
120 
 
121 
        ////////////////
122 
        // intr space //
123 
        ////////////////
124 
 
125 
        ///////////////////////
126 
        // code & data space //
127 
        ///////////////////////
128 
 
129 
        // thread 0 : do jmp_i tests
130 
        i='h40;  ram[i] = {  op_lit_u,              `_, `_, `s0, `s2 };  // lit => s2
131 
        i=i+1;   ram[i] = 16'h300                                     ;  // addr
132 
        i=i+1;   ram[i] = {  op_gsb,                `P, `_, `s2, `s3 };  // gsb, pop s2 (addr)
133 
        // loop forever
134 
        i=i+1;   ram[i] = { `op_jmp_i,       -5'h1, `_, `_, `s0, `s0 };  // loop forever
135 
 
136 
        // thread 1 : do jmp tests
137 
        i='h44;  ram[i] = {  op_lit_u,              `_, `_, `s0, `s2 };  // lit => s2
138 
        i=i+1;   ram[i] = 16'h500                                     ;  // addr
139 
        i=i+1;   ram[i] = {  op_gsb,                `P, `_, `s2, `s3 };  // gsb, pop s2 (addr)
140 
        // loop forever
141 
        i=i+1;   ram[i] = { `op_jmp_i,       -5'h1, `_, `_, `s0, `s0 };  // loop forever
142 
 
143 
        // thread 2 : do gto tests
144 
        i='h48;  ram[i] = {  op_lit_u,              `_, `_, `s0, `s2 };  // lit => s2
145 
        i=i+1;   ram[i] = 16'h700                                     ;  // addr
146 
        i=i+1;   ram[i] = {  op_gsb,                `P, `_, `s2, `s3 };  // gsb, pop s2 (addr)
147 
        // loop forever
148 
        i=i+1;   ram[i] = { `op_jmp_i,       -5'h1, `_, `_, `s0, `s0 };  // loop forever
149 
 
150 
 
151 
        /////////////////
152 
        // subroutines //
153 
        /////////////////
154 
 
155 
 
156 
 
157 
        // sub : test all jmp_i instructions, result in s0, return to (s3)
158 
        // Correct functioning is s0 = 'd91 ('h5b).
159 
        //
160 
        // s0 : 0 (ez), final test result
161 
        // s1 : +1 (gz)
162 
        // s2 : -2 (lz)
163 
        // s3 : running test result, subroutine return address
164 
        //
165 
        // setup test values and running test result:
166 
        i='h300; ram[i] = { `op_byt_i,        8'd0, `_, `_, `s0, `s0 };  // 0=>s0
167 
        i=i+1;   ram[i] = { `op_byt_i,        8'd1, `_, `_, `s0, `s1 };  // 1=>s1
168 
        i=i+1;   ram[i] = { `op_byt_i,       -8'd2, `_, `_, `s0, `s2 };  // -2=>s2
169 
        i=i+1;   ram[i] = { `op_byt_i,        8'd0, `_, `_, `s0, `s3 };  // 1=>s1
170 
        //
171 
        // distance testing
172 
        //
173 
        i=i+1;   ram[i] = { `op_jmp_i,       5'd15, `_, `_, `s0, `s1 };  // jump forward
174 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3
175 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
176 
        i=i+1;   ram[i] = { `op_jmp_i,       5'd10, `_, `_, `s0, `s1 };  // jump forward
177 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
178 
        i=i+1;   ram[i] = { `op_jmp_i,        5'd6, `_, `_, `s0, `s1 };  // jump forward
179 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
180 
        i=i+1;   ram[i] = { `op_jmp_i,        5'd2, `_, `_, `s0, `s1 };  // jump forward
181 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
182 
        i=i+1;   ram[i] = { `op_jmp_i,        5'd8, `_, `_, `s0, `s1 };  // jump forward (and out)
183 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
184 
        i=i+1;   ram[i] = { `op_jmp_i,       -5'd4, `_, `_, `s0, `s1 };  // jump back
185 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
186 
        i=i+1;   ram[i] = { `op_jmp_i,       -5'd8, `_, `_, `s0, `s1 };  // jump back
187 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
188 
        i=i+1;   ram[i] = { `op_jmp_i,      -5'd12, `_, `_, `s0, `s1 };  // jump back
189 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
190 
        i=i+1;   ram[i] = { `op_jmp_i,      -5'd16, `_, `_, `s0, `s1 };  // jump back
191 
        //
192 
        // unconditional testing
193 
        //
194 
        i=i+1;   ram[i] = { `op_jmp_i,        5'd1, `_, `_, `s0, `s1 };  // jump (YYY)
195 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
196 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
197 
        i=i+1;   ram[i] = { `op_jmp_i,        5'd1, `_, `_, `s0, `s2 };  // jump
198 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
199 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
200 
        i=i+1;   ram[i] = { `op_jmp_i,        5'd1, `_, `_, `s0, `s0 };  // jump
201 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
202 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
203 
        //
204 
        i=i+1;   ram[i] = { `op_jmp_i,        5'd1, `_, `_, `s1, `s1 };  // jump (YYY)
205 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
206 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
207 
        i=i+1;   ram[i] = { `op_jmp_i,        5'd1, `_, `_, `s1, `s2 };  // jump
208 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
209 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
210 
        i=i+1;   ram[i] = { `op_jmp_i,        5'd1, `_, `_, `s1, `s0 };  // jump
211 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
212 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
213 
        //
214 
        i=i+1;   ram[i] = { `op_jmp_i,        5'd1, `_, `_, `s2, `s1 };  // jump (YYY)
215 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
216 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
217 
        i=i+1;   ram[i] = { `op_jmp_i,        5'd1, `_, `_, `s2, `s2 };  // jump
218 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
219 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
220 
        i=i+1;   ram[i] = { `op_jmp_i,        5'd1, `_, `_, `s2, `s0 };  // jump
221 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
222 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
223 
        //
224 
        // (A?0) testing
225 
        // ez
226 
        i=i+1;   ram[i] = { `op_jmp_iez,      5'd1, `_, `_, `s0, `s1 };  // (s1==0) ? jump (NNY)
227 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
228 
        i=i+1;   ram[i] = { `op_jmp_iez,      5'd1, `_, `_, `s0, `s2 };  // (s2==0) ? jump
229 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
230 
        i=i+1;   ram[i] = { `op_jmp_iez,      5'd1, `_, `_, `s0, `s0 };  // (s0==0) ? jump
231 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
232 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
233 
        // lz
234 
        i=i+1;   ram[i] = { `op_jmp_ilz,      5'd1, `_, `_, `s0, `s1 };  // (s1<0) ? jump (NYN)
235 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
236 
        i=i+1;   ram[i] = { `op_jmp_ilz,      5'd1, `_, `_, `s0, `s2 };  // (s2<0) ? jump
237 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
238 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
239 
        i=i+1;   ram[i] = { `op_jmp_ilz,      5'd1, `_, `_, `s0, `s0 };  // (s0<0) ? jump
240 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
241 
        // lez
242 
        i=i+1;   ram[i] = { `op_jmp_ilez,     5'd1, `_, `_, `s0, `s1 };  // (s1<=0) ? jump (NYY)
243 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
244 
        i=i+1;   ram[i] = { `op_jmp_ilez,     5'd1, `_, `_, `s0, `s2 };  // (s2<=0) ? jump
245 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
246 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
247 
        i=i+1;   ram[i] = { `op_jmp_ilez,     5'd1, `_, `_, `s0, `s0 };  // (s0<=0) ? jump
248 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
249 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
250 
        // gz
251 
        i=i+1;   ram[i] = { `op_jmp_igz,      5'd1, `_, `_, `s0, `s1 };  // (s1>0) ? jump (YNN)
252 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
253 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
254 
        i=i+1;   ram[i] = { `op_jmp_igz,      5'd1, `_, `_, `s0, `s2 };  // (s2>0) ? jump
255 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
256 
        i=i+1;   ram[i] = { `op_jmp_igz,      5'd1, `_, `_, `s0, `s0 };  // (s0>0) ? jump
257 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
258 
        // gez
259 
        i=i+1;   ram[i] = { `op_jmp_igez,     5'd1, `_, `_, `s0, `s1 };  // (s1>=0) ? jump (YNY)
260 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
261 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
262 
        i=i+1;   ram[i] = { `op_jmp_igez,     5'd1, `_, `_, `s0, `s2 };  // (s2>=0) ? jump
263 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
264 
        i=i+1;   ram[i] = { `op_jmp_igez,     5'd1, `_, `_, `s0, `s0 };  // (s0>=0) ? jump
265 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
266 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
267 
        // glz
268 
        i=i+1;   ram[i] = { `op_jmp_iglz,     5'd1, `_, `_, `s0, `s1 };  // (s1<>0) ? jump (YYN)
269 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
270 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
271 
        i=i+1;   ram[i] = { `op_jmp_iglz,     5'd1, `_, `_, `s0, `s2 };  // (s2<>0) ? jump
272 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
273 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
274 
        i=i+1;   ram[i] = { `op_jmp_iglz,     5'd1, `_, `_, `s0, `s0 };  // (s0<>0) ? jump
275 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
276 
        //
277 
        // (A?B) testing
278 
        //
279 
        // e
280 
        i=i+1;   ram[i] = { `op_jmp_ie,       5'd1, `_, `_, `s0, `s1 };  // (s1==s0) ? jump (NNY)
281 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
282 
        i=i+1;   ram[i] = { `op_jmp_ie,       5'd1, `_, `_, `s0, `s2 };  // (s2==s0) ? jump
283 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+2=>s3, pop s3 (N)
284 
        i=i+1;   ram[i] = { `op_jmp_ie,       5'd1, `_, `_, `s0, `s0 };  // (s0==s0) ? jump
285 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
286 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
287 
        //
288 
        i=i+1;   ram[i] = { `op_jmp_ie,       5'd1, `_, `_, `s1, `s1 };  // (s1==s1) ? jump (YNN)
289 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
290 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
291 
        i=i+1;   ram[i] = { `op_jmp_ie,       5'd1, `_, `_, `s1, `s2 };  // (s2==s1) ? jump
292 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
293 
        i=i+1;   ram[i] = { `op_jmp_ie,       5'd1, `_, `_, `s1, `s0 };  // (s0==s1) ? jump
294 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
295 
        //
296 
        i=i+1;   ram[i] = { `op_jmp_ie,       5'd1, `_, `_, `s2, `s1 };  // (s1==s2) ? jump (NYN)
297 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
298 
        i=i+1;   ram[i] = { `op_jmp_ie,       5'd1, `_, `_, `s2, `s2 };  // (s2==s2) ? jump
299 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
300 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
301 
        i=i+1;   ram[i] = { `op_jmp_ie,       5'd1, `_, `_, `s2, `s0 };  // (s0==s2) ? jump
302 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
303 
        // l
304 
        i=i+1;   ram[i] = { `op_jmp_il,       5'd1, `_, `_, `s0, `s1 };  // (s1<s0) ? jump (NYN)
305 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
306 
        i=i+1;   ram[i] = { `op_jmp_il,       5'd1, `_, `_, `s0, `s2 };  // (s2<s0) ? jump
307 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
308 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
309 
        i=i+1;   ram[i] = { `op_jmp_il,       5'd1, `_, `_, `s0, `s0 };  // (s0<s0) ? jump
310 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
311 
        //
312 
        i=i+1;   ram[i] = { `op_jmp_il,       5'd1, `_, `_, `s1, `s1 };  // (s1<s1) ? jump (NYY)
313 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
314 
        i=i+1;   ram[i] = { `op_jmp_il,       5'd1, `_, `_, `s1, `s2 };  // (s2<s1) ? jump
315 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
316 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
317 
        i=i+1;   ram[i] = { `op_jmp_il,       5'd1, `_, `_, `s1, `s0 };  // (s0<s1) ? jump
318 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
319 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
320 
        //
321 
        i=i+1;   ram[i] = { `op_jmp_il,       5'd1, `_, `_, `s2, `s1 };  // (s1<s2) ? jump (NNN)
322 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
323 
        i=i+1;   ram[i] = { `op_jmp_il,       5'd1, `_, `_, `s2, `s2 };  // (s2<s2) ? jump
324 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
325 
        i=i+1;   ram[i] = { `op_jmp_il,       5'd1, `_, `_, `s2, `s0 };  // (s0<s2) ? jump
326 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
327 
        // le
328 
        i=i+1;   ram[i] = { `op_jmp_ile,      5'd1, `_, `_, `s0, `s1 };  // (s1<=s0) ? jump (NYY)
329 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
330 
        i=i+1;   ram[i] = { `op_jmp_ile,      5'd1, `_, `_, `s0, `s2 };  // (s2<=s0) ? jump
331 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
332 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
333 
        i=i+1;   ram[i] = { `op_jmp_ile,      5'd1, `_, `_, `s0, `s0 };  // (s0<=s0) ? jump
334 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
335 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
336 
        //
337 
        i=i+1;   ram[i] = { `op_jmp_ile,      5'd1, `_, `_, `s1, `s1 };  // (s1<=s1) ? jump (YYY)
338 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
339 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
340 
        i=i+1;   ram[i] = { `op_jmp_ile,      5'd1, `_, `_, `s1, `s2 };  // (s2<=s1) ? jump
341 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
342 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
343 
        i=i+1;   ram[i] = { `op_jmp_ile,      5'd1, `_, `_, `s1, `s0 };  // (s0<=s1) ? jump
344 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
345 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
346 
        //
347 
        i=i+1;   ram[i] = { `op_jmp_ile,      5'd1, `_, `_, `s2, `s1 };  // (s1<=s2) ? jump (NYN)
348 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
349 
        i=i+1;   ram[i] = { `op_jmp_ile,      5'd1, `_, `_, `s2, `s2 };  // (s2<=s2) ? jump
350 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
351 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
352 
        i=i+1;   ram[i] = { `op_jmp_ile,      5'd1, `_, `_, `s2, `s0 };  // (s0<=s2) ? jump
353 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
354 
        // ug
355 
        i=i+1;   ram[i] = { `op_jmp_iug,      5'd1, `_, `_, `s0, `s1 };  // (s1>s0) ? jump (YYN)
356 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
357 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
358 
        i=i+1;   ram[i] = { `op_jmp_iug,      5'd1, `_, `_, `s0, `s2 };  // (s2>s0) ? jump
359 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
360 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
361 
        i=i+1;   ram[i] = { `op_jmp_iug,      5'd1, `_, `_, `s0, `s0 };  // (s0>s0) ? jump
362 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
363 
        //
364 
        i=i+1;   ram[i] = { `op_jmp_iug,      5'd1, `_, `_, `s1, `s1 };  // (s1>s1) ? jump (NYN)
365 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
366 
        i=i+1;   ram[i] = { `op_jmp_iug,      5'd1, `_, `_, `s1, `s2 };  // (s2>s1) ? jump
367 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
368 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
369 
        i=i+1;   ram[i] = { `op_jmp_iug,      5'd1, `_, `_, `s1, `s0 };  // (s0>s1) ? jump
370 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
371 
        //
372 
        i=i+1;   ram[i] = { `op_jmp_iug,      5'd1, `_, `_, `s2, `s1 };  // (s1>s2) ? jump (NNN)
373 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
374 
        i=i+1;   ram[i] = { `op_jmp_iug,      5'd1, `_, `_, `s2, `s2 };  // (s2>s2) ? jump
375 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
376 
        i=i+1;   ram[i] = { `op_jmp_iug,      5'd1, `_, `_, `s2, `s0 };  // (s0>s2) ? jump
377 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
378 
        // uge
379 
        i=i+1;   ram[i] = { `op_jmp_iuge,     5'd1, `_, `_, `s0, `s1 };  // (s1>=s0) ? jump (YYY)
380 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
381 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
382 
        i=i+1;   ram[i] = { `op_jmp_iuge,     5'd1, `_, `_, `s0, `s2 };  // (s2>=s0) ? jump
383 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
384 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
385 
        i=i+1;   ram[i] = { `op_jmp_iuge,     5'd1, `_, `_, `s0, `s0 };  // (s0>=s0) ? jump
386 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
387 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
388 
        //
389 
        i=i+1;   ram[i] = { `op_jmp_iuge,     5'd1, `_, `_, `s1, `s1 };  // (s1>=s1) ? jump (YYN)
390 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
391 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
392 
        i=i+1;   ram[i] = { `op_jmp_iuge,     5'd1, `_, `_, `s1, `s2 };  // (s2>=s1) ? jump
393 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
394 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
395 
        i=i+1;   ram[i] = { `op_jmp_iuge,     5'd1, `_, `_, `s1, `s0 };  // (s0>=s1) ? jump
396 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
397 
        //
398 
        i=i+1;   ram[i] = { `op_jmp_iuge,     5'd1, `_, `_, `s2, `s1 };  // (s1>=s2) ? jump (NYN)
399 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
400 
        i=i+1;   ram[i] = { `op_jmp_iuge,     5'd1, `_, `_, `s2, `s2 };  // (s2>=s2) ? jump
401 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
402 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
403 
        i=i+1;   ram[i] = { `op_jmp_iuge,     5'd1, `_, `_, `s2, `s0 };  // (s0>=s2) ? jump
404 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
405 
        // gl
406 
        i=i+1;   ram[i] = { `op_jmp_igl,      5'd1, `_, `_, `s0, `s1 };  // (s1<>s0) ? jump (YYN)
407 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
408 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
409 
        i=i+1;   ram[i] = { `op_jmp_igl,      5'd1, `_, `_, `s0, `s2 };  // (s2<>s0) ? jump
410 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
411 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
412 
        i=i+1;   ram[i] = { `op_jmp_igl,      5'd1, `_, `_, `s0, `s0 };  // (s0<>s0) ? jump
413 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
414 
        //
415 
        i=i+1;   ram[i] = { `op_jmp_igl,      5'd1, `_, `_, `s1, `s1 };  // (s1<>s1) ? jump (NYY)
416 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
417 
        i=i+1;   ram[i] = { `op_jmp_igl,      5'd1, `_, `_, `s1, `s2 };  // (s2<>s1) ? jump
418 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
419 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
420 
        i=i+1;   ram[i] = { `op_jmp_igl,      5'd1, `_, `_, `s1, `s0 };  // (s0<>s1) ? jump
421 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
422 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
423 
        //
424 
        i=i+1;   ram[i] = { `op_jmp_igl,      5'd1, `_, `_, `s2, `s1 };  // (s1<>s2) ? jump (YNY)
425 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
426 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
427 
        i=i+1;   ram[i] = { `op_jmp_igl,      5'd1, `_, `_, `s2, `s2 };  // (s2<>s2) ? jump
428 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
429 
        i=i+1;   ram[i] = { `op_jmp_igl,      5'd1, `_, `_, `s2, `s0 };  // (s0<>s2) ? jump
430 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
431 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
432 
        // cleanup
433 
        i=i+1;   ram[i] = {  op_pop,                `P, `P, `s2, `s1 };  // pop s1 & s2
434 
        // check for opcode errors
435 
        i=i+1;   ram[i] = {  op_lit_u,              `_, `_, `s0, `s2 };  // lit => s2
436 
        i=i+1;   ram[i] = 16'h900                                     ;  // addr
437 
        i=i+1;   ram[i] = {  op_gsb,                `P, `_, `s2, `s3 };  // gsb, pop s2 (addr)
438 
        i=i+1;   ram[i] = { `op_jmp_iez,      5'd1, `_, `_, `s0, `s0 };  // (s0==0) ? skip
439 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
440 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `P, `P, `s0, `s3 };  // s3+1=>s3, pop both
441 
        // check for stack errors
442 
        i=i+1;   ram[i] = {  op_lit_u,              `_, `_, `s0, `s2 };  // lit => s2
443 
        i=i+1;   ram[i] = 16'h910                                     ;  // addr
444 
        i=i+1;   ram[i] = {  op_gsb,                `P, `_, `s2, `s3 };  // gsb, pop s2 (addr)
445 
        i=i+1;   ram[i] = { `op_jmp_iez,      5'd1, `_, `_, `s0, `s0 };  // (s0==0) ? skip
446 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
447 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `P, `P, `s0, `s3 };  // s3+1=>s3, pop both
448 
        // s3=>s0, return
449 
        i=i+1;   ram[i] = {  op_cpy,                `P, `P, `s3, `s0 };  // s3=>s0, pop both
450 
        i=i+1;   ram[i] = {  op_gto,                `P, `_, `s3, `s0 };  // return to (s3), pop s3
451 
        // end sub
452 
 
453 
 
454 
        // sub : test all jmp instructions, result in s0, return to (s3)
455 
        // Correct functioning is s0 = 'd29 ('h1D).
456 
        //
457 
        // s0 : 0 (ez), final test result
458 
        // s1 : +1 (gz)
459 
        // s2 : -2 (lz)
460 
        // s3 : running test result, subroutine return address
461 
        //
462 
        // setup test values and running test result:
463 
        i='h500; ram[i] = { `op_byt_i,        8'd0, `_, `_, `s0, `s0 };  // 0=>s0
464 
        i=i+1;   ram[i] = { `op_byt_i,        8'd1, `_, `_, `s0, `s1 };  // 1=>s1
465 
        i=i+1;   ram[i] = { `op_byt_i,       -8'd2, `_, `_, `s0, `s2 };  // -2=>s2
466 
        i=i+1;   ram[i] = { `op_byt_i,        8'd0, `_, `_, `s0, `s3 };  // 1=>s1
467 
        //
468 
        // distance testing
469 
        //
470 
        i=i+1;   ram[i] = { `op_byt_i,       8'd15, `_, `_, `s0, `s2 };  // 15=>s2
471 
        i=i+1;   ram[i] = {  op_jmp,                `P, `_, `s2, `s0 };  // jump forward, pop s2
472 
        //
473 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
474 
        i=i+1;   ram[i] = { `op_byt_i,        8'd9, `_, `_, `s0, `s2 };  // 9=>s2
475 
        i=i+1;   ram[i] = {  op_jmp,                `P, `_, `s2, `s0 };  // jump forward, pop s2
476 
        //
477 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
478 
        i=i+1;   ram[i] = { `op_byt_i,        8'd3, `_, `_, `s0, `s2 };  // 3=>s2
479 
        i=i+1;   ram[i] = {  op_jmp,                `P, `_, `s2, `s0 };  // jump forward, pop s2
480 
        //
481 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
482 
        i=i+1;   ram[i] = { `op_byt_i,        8'd9, `_, `_, `s0, `s2 };  // 9=>s2
483 
        i=i+1;   ram[i] = {  op_jmp,                `P, `_, `s2, `s0 };  // jump forward (and out), pop s2
484 
        //
485 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
486 
        i=i+1;   ram[i] = { `op_byt_i,       -8'd6, `_, `_, `s0, `s2 };  // -6=>s2
487 
        i=i+1;   ram[i] = {  op_jmp,                `P, `_, `s2, `s0 };  // jump back, pop s2
488 
        //
489 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
490 
        i=i+1;   ram[i] = { `op_byt_i,      -8'd12, `_, `_, `s0, `s2 };  // -12=>s2
491 
        i=i+1;   ram[i] = {  op_jmp,                `P, `_, `s2, `s0 };  // jump back, pop s2
492 
        //
493 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
494 
        i=i+1;   ram[i] = { `op_byt_i,      -8'd18, `_, `_, `s0, `s2 };  // -18=>s2
495 
        i=i+1;   ram[i] = {  op_jmp,                `P, `_, `s2, `s0 };  // jump back, pop s2
496 
        //
497 
        // unconditional testing
498 
        //
499 
        i=i+1;   ram[i] = {  op_jmp,                `_, `_, `s1, `s1 };  // jump (YYY)
500 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
501 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
502 
        i=i+1;   ram[i] = {  op_jmp,                `_, `_, `s1, `s2 };  // jump
503 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
504 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
505 
        i=i+1;   ram[i] = {  op_jmp,                `_, `_, `s1, `s0 };  // jump
506 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
507 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
508 
        //
509 
        // (A?0) testing
510 
        // ez
511 
        i=i+1;   ram[i] = {  op_jmp_ez,             `_, `_, `s1, `s1 };  // (s1==0) ? jump (NNY)
512 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
513 
        i=i+1;   ram[i] = {  op_jmp_ez,             `_, `_, `s1, `s2 };  // (s2==0) ? jump
514 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
515 
        i=i+1;   ram[i] = {  op_jmp_ez,             `_, `_, `s1, `s0 };  // (s0==0) ? jump
516 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
517 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
518 
        // lz
519 
        i=i+1;   ram[i] = {  op_jmp_lz,             `_, `_, `s1, `s1 };  // (s1<0) ? jump (NYN)
520 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
521 
        i=i+1;   ram[i] = {  op_jmp_lz,             `_, `_, `s1, `s2 };  // (s2<0) ? jump
522 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
523 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
524 
        i=i+1;   ram[i] = {  op_jmp_lz,             `_, `_, `s1, `s0 };  // (s0<0) ? jump
525 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
526 
        // lez
527 
        i=i+1;   ram[i] = {  op_jmp_lez,            `_, `_, `s1, `s1 };  // (s1<=0) ? jump (NYY)
528 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
529 
        i=i+1;   ram[i] = {  op_jmp_lez,            `_, `_, `s1, `s2 };  // (s2<=0) ? jump
530 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
531 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
532 
        i=i+1;   ram[i] = {  op_jmp_lez,            `_, `_, `s1, `s0 };  // (s0<=0) ? jump
533 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
534 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
535 
        // gz
536 
        i=i+1;   ram[i] = {  op_jmp_gz,             `_, `_, `s1, `s1 };  // (s1>0) ? jump (YNN)
537 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
538 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
539 
        i=i+1;   ram[i] = {  op_jmp_gz,             `_, `_, `s1, `s2 };  // (s2>0) ? jump
540 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
541 
        i=i+1;   ram[i] = {  op_jmp_gz,             `_, `_, `s1, `s0 };  // (s0>0) ? jump
542 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
543 
        // gez
544 
        i=i+1;   ram[i] = {  op_jmp_gez,            `_, `_, `s1, `s1 };  // (s1>=0) ? jump (YNY)
545 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
546 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
547 
        i=i+1;   ram[i] = {  op_jmp_gez,            `_, `_, `s1, `s2 };  // (s2>=0) ? jump
548 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
549 
        i=i+1;   ram[i] = {  op_jmp_gez,            `_, `_, `s1, `s0 };  // (s0>=0) ? jump
550 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
551 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
552 
        // glz
553 
        i=i+1;   ram[i] = {  op_jmp_glz,            `_, `_, `s1, `s1 };  // (s1<>0) ? jump (YYN)
554 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
555 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
556 
        i=i+1;   ram[i] = {  op_jmp_glz,            `_, `_, `s1, `s2 };  // (s2<>0) ? jump
557 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
558 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
559 
        i=i+1;   ram[i] = {  op_jmp_glz,            `_, `_, `s1, `s0 };  // (s0<>0) ? jump
560 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
561 
        // cleanup
562 
        i=i+1;   ram[i] = {  op_pop,                `P, `P, `s2, `s1 };  // pop s1 & s2
563 
        // check for opcode errors
564 
        i=i+1;   ram[i] = {  op_lit_u,              `_, `_, `s0, `s2 };  // lit => s2
565 
        i=i+1;   ram[i] = 16'h900                                     ;  // addr
566 
        i=i+1;   ram[i] = {  op_gsb,                `P, `_, `s2, `s3 };  // gsb, pop s2 (addr)
567 
        i=i+1;   ram[i] = { `op_jmp_iez,      5'd1, `_, `_, `s0, `s0 };  // (s0==0) ? skip
568 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
569 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `P, `P, `s0, `s3 };  // s3+1=>s3, pop both
570 
        // check for stack errors
571 
        i=i+1;   ram[i] = {  op_lit_u,              `_, `_, `s0, `s2 };  // lit => s2
572 
        i=i+1;   ram[i] = 16'h910                                     ;  // addr
573 
        i=i+1;   ram[i] = {  op_gsb,                `P, `_, `s2, `s3 };  // gsb, pop s2 (addr)
574 
        i=i+1;   ram[i] = { `op_jmp_iez,      5'd1, `_, `_, `s0, `s0 };  // (s0==0) ? skip
575 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
576 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `P, `P, `s0, `s3 };  // s3+1=>s3, pop both
577 
        // s3=>s0, return
578 
        i=i+1;   ram[i] = {  op_cpy,                `P, `P, `s3, `s0 };  // s3=>s0, pop both
579 
        i=i+1;   ram[i] = {  op_gto,                `P, `_, `s3, `s0 };  // return to (s3), pop s3
580 
        // end sub
581 
 
582 
 
583 
        // sub : test all gto instructions, result in s0, return to (s3)
584 
        // Correct functioning is s0 = 'd25 ('h19).
585 
        //
586 
        // s0 : 0 (ez), final test result
587 
        // s1 : PC (gz)
588 
        // s2 : -2 (lz)
589 
        // s3 : running test result, subroutine return address
590 
        //
591 
        // setup test values and running test result:
592 
        i='h700; ram[i] = { `op_byt_i,        8'd0, `_, `_, `s0, `s0 };  // 0=>s0
593 
        i=i+1;   ram[i] = { `op_byt_i,       -8'd2, `_, `_, `s0, `s2 };  // -2=>s2
594 
        i=i+1;   ram[i] = { `op_byt_i,        8'd0, `_, `_, `s0, `s3 };  // 1=>s1
595 
        //
596 
        // distance testing
597 
        //
598 
        i=i+1;   ram[i] = {  op_pc,                 `_, `_, `s0, `s1 };  // pc => s1
599 
        i=i+1;   ram[i] = { `op_add_i,        6'd6, `_, `P, `s0, `s1 };  // s1+6=>s1, pop s1
600 
        i=i+1;   ram[i] = {  op_gto,                `P, `_, `s1, `s0 };  // go forward, pop s1
601 
        //
602 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
603 
        i=i+1;   ram[i] = {  op_pc,                 `_, `_, `s0, `s1 };  // pc => s1
604 
        i=i+1;   ram[i] = { `op_add_i,        6'd6, `_, `P, `s0, `s1 };  // s1+6=>s1, pop s1
605 
        i=i+1;   ram[i] = {  op_gto,                `P, `_, `s1, `s0 };  // go forward, pop s1
606 
        //
607 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
608 
        i=i+1;   ram[i] = {  op_pc,                 `_, `_, `s0, `s1 };  // pc => s1
609 
        i=i+1;   ram[i] = { `op_add_i,       -6'd6, `_, `P, `s0, `s1 };  // s1-6=>s1, pop s1
610 
        i=i+1;   ram[i] = {  op_gto,                `P, `_, `s1, `s0 };  // go back, pop s1
611 
        //
612 
        // unconditional testing
613 
        //
614 
        i=i+1;   ram[i] = {  op_pc,                 `_, `_, `s0, `s1 };  // pc => s1
615 
        i=i+1;   ram[i] = { `op_add_i,        6'd3, `_, `P, `s0, `s1 };  // s1+3=>s1, pop s1
616 
        i=i+1;   ram[i] = {  op_gto,                `P, `_, `s1, `s1 };  // go, pop s1 (YYY)
617 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
618 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
619 
        //
620 
        i=i+1;   ram[i] = {  op_pc,                 `_, `_, `s0, `s1 };  // pc => s1
621 
        i=i+1;   ram[i] = { `op_add_i,        6'd3, `_, `P, `s0, `s1 };  // s1+3=>s1, pop s1
622 
        i=i+1;   ram[i] = {  op_gto,                `P, `_, `s1, `s2 };  // go, pop s1 (YYY)
623 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
624 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
625 
        //
626 
        i=i+1;   ram[i] = {  op_pc,                 `_, `_, `s0, `s1 };  // pc => s1
627 
        i=i+1;   ram[i] = { `op_add_i,        6'd3, `_, `P, `s0, `s1 };  // s1+3=>s1, pop s1
628 
        i=i+1;   ram[i] = {  op_gto,                `P, `_, `s1, `s0 };  // go, pop s1 (YYY)
629 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
630 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
631 
        //
632 
        // (A?0) testing
633 
        // ez
634 
        i=i+1;   ram[i] = {  op_pc,                 `_, `_, `s0, `s1 };  // pc => s1
635 
        i=i+1;   ram[i] = { `op_add_i,        6'd3, `_, `P, `s0, `s1 };  // s1+3=>s1, pop s1
636 
        i=i+1;   ram[i] = {  op_gto_ez,             `P, `_, `s1, `s1 };  // (s1==0) ? go, pop s1(NNY)
637 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
638 
        //
639 
        i=i+1;   ram[i] = {  op_pc,                 `_, `_, `s0, `s1 };  // pc => s1
640 
        i=i+1;   ram[i] = { `op_add_i,        6'd3, `_, `P, `s0, `s1 };  // s1+3=>s1, pop s1
641 
        i=i+1;   ram[i] = {  op_gto_ez,             `P, `_, `s1, `s2 };  // (s2==0) ? go, pop s1
642 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
643 
        //
644 
        i=i+1;   ram[i] = {  op_pc,                 `_, `_, `s0, `s1 };  // pc => s1
645 
        i=i+1;   ram[i] = { `op_add_i,        6'd3, `_, `P, `s0, `s1 };  // s1+3=>s1, pop s1
646 
        i=i+1;   ram[i] = {  op_gto_ez,             `P, `_, `s1, `s0 };  // (s0==0) ? go, pop s1
647 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
648 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
649 
        // lz
650 
        i=i+1;   ram[i] = {  op_pc,                 `_, `_, `s0, `s1 };  // pc => s1
651 
        i=i+1;   ram[i] = { `op_add_i,        6'd3, `_, `P, `s0, `s1 };  // s1+3=>s1, pop s1
652 
        i=i+1;   ram[i] = {  op_gto_lz,             `P, `_, `s1, `s1 };  // (s1<0) ? go, pop s1(NYN)
653 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
654 
        //
655 
        i=i+1;   ram[i] = {  op_pc,                 `_, `_, `s0, `s1 };  // pc => s1
656 
        i=i+1;   ram[i] = { `op_add_i,        6'd3, `_, `P, `s0, `s1 };  // s1+3=>s1, pop s1
657 
        i=i+1;   ram[i] = {  op_gto_lz,             `P, `_, `s1, `s2 };  // (s2<0) ? go, pop s1
658 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
659 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
660 
        //
661 
        i=i+1;   ram[i] = {  op_pc,                 `_, `_, `s0, `s1 };  // pc => s1
662 
        i=i+1;   ram[i] = { `op_add_i,        6'd3, `_, `P, `s0, `s1 };  // s1+3=>s1, pop s1
663 
        i=i+1;   ram[i] = {  op_gto_lz,             `P, `_, `s1, `s0 };  // (s0<0) ? go, pop s1
664 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
665 
        // lez
666 
        i=i+1;   ram[i] = {  op_pc,                 `_, `_, `s0, `s1 };  // pc => s1
667 
        i=i+1;   ram[i] = { `op_add_i,        6'd3, `_, `P, `s0, `s1 };  // s1+3=>s1, pop s1
668 
        i=i+1;   ram[i] = {  op_gto_lez,            `P, `_, `s1, `s1 };  // (s1<=0) ? go, pop s1(NYY)
669 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
670 
        //
671 
        i=i+1;   ram[i] = {  op_pc,                 `_, `_, `s0, `s1 };  // pc => s1
672 
        i=i+1;   ram[i] = { `op_add_i,        6'd3, `_, `P, `s0, `s1 };  // s1+3=>s1, pop s1
673 
        i=i+1;   ram[i] = {  op_gto_lez,            `P, `_, `s1, `s2 };  // (s2<=0) ? go, pop s1
674 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
675 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
676 
        //
677 
        i=i+1;   ram[i] = {  op_pc,                 `_, `_, `s0, `s1 };  // pc => s1
678 
        i=i+1;   ram[i] = { `op_add_i,        6'd3, `_, `P, `s0, `s1 };  // s1+3=>s1, pop s1
679 
        i=i+1;   ram[i] = {  op_gto_lez,            `P, `_, `s1, `s0 };  // (s0<=0) ? go, pop s1
680 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
681 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
682 
        // gz
683 
        i=i+1;   ram[i] = {  op_pc,                 `_, `_, `s0, `s1 };  // pc => s1
684 
        i=i+1;   ram[i] = { `op_add_i,        6'd3, `_, `P, `s0, `s1 };  // s1+3=>s1, pop s1
685 
        i=i+1;   ram[i] = {  op_gto_gz,             `P, `_, `s1, `s1 };  // (s1>0) ? go, pop s1(YNN)
686 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
687 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
688 
        //
689 
        i=i+1;   ram[i] = {  op_pc,                 `_, `_, `s0, `s1 };  // pc => s1
690 
        i=i+1;   ram[i] = { `op_add_i,        6'd3, `_, `P, `s0, `s1 };  // s1+3=>s1, pop s1
691 
        i=i+1;   ram[i] = {  op_gto_gz,             `P, `_, `s1, `s2 };  // (s2>0) ? go, pop s1
692 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
693 
        //
694 
        i=i+1;   ram[i] = {  op_pc,                 `_, `_, `s0, `s1 };  // pc => s1
695 
        i=i+1;   ram[i] = { `op_add_i,        6'd3, `_, `P, `s0, `s1 };  // s1+3=>s1, pop s1
696 
        i=i+1;   ram[i] = {  op_gto_gz,             `P, `_, `s1, `s0 };  // (s0>0) ? go, pop s1
697 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
698 
        // gez
699 
        i=i+1;   ram[i] = {  op_pc,                 `_, `_, `s0, `s1 };  // pc => s1
700 
        i=i+1;   ram[i] = { `op_add_i,        6'd3, `_, `P, `s0, `s1 };  // s1+3=>s1, pop s1
701 
        i=i+1;   ram[i] = {  op_gto_gez,            `P, `_, `s1, `s1 };  // (s1>=0) ? go, pop s1(YNY)
702 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
703 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
704 
        //
705 
        i=i+1;   ram[i] = {  op_pc,                 `_, `_, `s0, `s1 };  // pc => s1
706 
        i=i+1;   ram[i] = { `op_add_i,        6'd3, `_, `P, `s0, `s1 };  // s1+3=>s1, pop s1
707 
        i=i+1;   ram[i] = {  op_gto_gez,            `P, `_, `s1, `s2 };  // (s2>=0) ? go, pop s1
708 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
709 
        //
710 
        i=i+1;   ram[i] = {  op_pc,                 `_, `_, `s0, `s1 };  // pc => s1
711 
        i=i+1;   ram[i] = { `op_add_i,        6'd3, `_, `P, `s0, `s1 };  // s1+3=>s1, pop s1
712 
        i=i+1;   ram[i] = {  op_gto_gez,            `P, `_, `s1, `s0 };  // (s0>=0) ? go, pop s1
713 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
714 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
715 
        // glz
716 
        i=i+1;   ram[i] = {  op_pc,                 `_, `_, `s0, `s1 };  // pc => s1
717 
        i=i+1;   ram[i] = { `op_add_i,        6'd3, `_, `P, `s0, `s1 };  // s1+3=>s1, pop s1
718 
        i=i+1;   ram[i] = {  op_gto_glz,            `P, `_, `s1, `s1 };  // (s1<>0) ? go, pop s1(YYN)
719 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
720 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
721 
        //
722 
        i=i+1;   ram[i] = {  op_pc,                 `_, `_, `s0, `s1 };  // pc => s1
723 
        i=i+1;   ram[i] = { `op_add_i,        6'd3, `_, `P, `s0, `s1 };  // s1+3=>s1, pop s1
724 
        i=i+1;   ram[i] = {  op_gto_glz,            `P, `_, `s1, `s2 };  // (s2<>0) ? go, pop s1
725 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
726 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3
727 
        //
728 
        i=i+1;   ram[i] = {  op_pc,                 `_, `_, `s0, `s1 };  // pc => s1
729 
        i=i+1;   ram[i] = { `op_add_i,        6'd3, `_, `P, `s0, `s1 };  // s1+3=>s1, pop s1
730 
        i=i+1;   ram[i] = {  op_gto_glz,            `P, `_, `s1, `s0 };  // (s0<>0) ? go, pop s1
731 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `_, `P, `s0, `s3 };  // s3+1=>s3, pop s3 (N)
732 
        // cleanup
733 
        i=i+1;   ram[i] = {  op_pop,                `_, `P, `s0, `s2 };  // pop s2
734 
        // check for opcode errors
735 
        i=i+1;   ram[i] = {  op_lit_u,              `_, `_, `s0, `s2 };  // lit => s2
736 
        i=i+1;   ram[i] = 16'h900                                     ;  // addr
737 
        i=i+1;   ram[i] = {  op_gsb,                `P, `_, `s2, `s3 };  // gsb, pop s2 (addr)
738 
        i=i+1;   ram[i] = { `op_jmp_iez,      5'd1, `_, `_, `s0, `s0 };  // (s0==0) ? skip
739 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
740 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `P, `P, `s0, `s3 };  // s3+1=>s3, pop both
741 
        // check for stack errors
742 
        i=i+1;   ram[i] = {  op_lit_u,              `_, `_, `s0, `s2 };  // lit => s2
743 
        i=i+1;   ram[i] = 16'h910                                     ;  // addr
744 
        i=i+1;   ram[i] = {  op_gsb,                `P, `_, `s2, `s3 };  // gsb, pop s2 (addr)
745 
        i=i+1;   ram[i] = { `op_jmp_iez,      5'd1, `_, `_, `s0, `s0 };  // (s0==0) ? skip
746 
        i=i+1;   ram[i] = { `op_add_i,       -6'd1, `_, `P, `s0, `s3 };  // s3-1=>s3, pop s3 (Y)
747 
        i=i+1;   ram[i] = { `op_add_i,        6'd1, `P, `P, `s0, `s3 };  // s3+1=>s3, pop both
748 
        // s3=>s0, return
749 
        i=i+1;   ram[i] = {  op_cpy,                `P, `P, `s3, `s0 };  // s3=>s0, pop both
750 
        i=i+1;   ram[i] = {  op_gto,                `P, `_, `s3, `s0 };  // return to (s3), pop s3
751 
        // end sub
752 
 
753 
 
754 
        // sub : read & clear opcode errors for this thread => s0, return to (s3)
755 
        i='h900; ram[i] = {  op_lit_u,              `_, `_, `s0, `s2 };  // lit => s2
756 
        i=i+1;   ram[i] = REG_BASE_ADDR                               ;  // reg base addr
757 
        i=i+1;   ram[i] = { `op_rd_i, THRD_ID_ADDR, `_, `_, `s2, `s0 };  // read (s2+offset)=>s0
758 
        i=i+1;   ram[i] = {  op_shl_u,              `_, `P, `s0, `s0 };  // 1<<s0=>s0, pop s0
759 
        i=i+1;   ram[i] = { `op_rd_i,   OP_ER_ADDR, `_, `_, `s2, `s1 };  // read (s2+offset)=>s1
760 
        i=i+1;   ram[i] = {  op_and,                `P, `P, `s1, `s0 };  // s0&s1=>s0, pop both
761 
        i=i+1;   ram[i] = { `op_wr_i,   OP_ER_ADDR, `P, `_, `s2, `s0 };  // write s0=>(s2+offset), pop s2
762 
        i=i+1;   ram[i] = {  op_gto,                `P, `_, `s3, `s0 };  // return to (s3), pop s3
763 
 
764 
 
765 
        // sub : read & clear stack errors for this thread => s0, return to (s3)
766 
        i='h910; ram[i] = {  op_lit_u,              `_, `_, `s0, `s2 };  // lit => s2
767 
        i=i+1;   ram[i] = REG_BASE_ADDR                               ;  // reg base addr
768 
        i=i+1;   ram[i] = { `op_rd_i, THRD_ID_ADDR, `_, `_, `s2, `s0 };  // read (s2+offset)=>s0
769 
        i=i+1;   ram[i] = {  op_shl_u,              `_, `P, `s0, `s0 };  // 1<<s0=>s0, pop s0
770 
        i=i+1;   ram[i] = {  op_cpy,                `_, `_, `s0, `s1 };  // s0=>s1
771 
        i=i+1;   ram[i] = { `op_shl_i,        6'd8, `_, `P, `s0, `s1 };  // s1<<8=>s1, pop s1
772 
        i=i+1;   ram[i] = {  op_or,                 `P, `P, `s1, `s0 };  // s0|s1=>s0, pop both
773 
        i=i+1;   ram[i] = { `op_rd_i,  STK_ER_ADDR, `_, `_, `s2, `s1 };  // read (s2+offset)=>s1
774 
        i=i+1;   ram[i] = {  op_and,                `P, `P, `s1, `s0 };  // s0&s1=>s0, pop both
775 
        i=i+1;   ram[i] = { `op_wr_i,  STK_ER_ADDR, `P, `_, `s2, `s0 };  // write s0=>(s2+offset), pop s2
776 
        i=i+1;   ram[i] = {  op_gto,                `P, `_, `s3, `s0 };  // return to (s3), pop s3
777 
 
778 
 
779 
        // sub : read 32 bit GPIO => s0, return to (s3)
780 
        i='h920; ram[i] = {  op_lit_u,              `_, `_, `s0, `s1 };  // lit => s1
781 
        i=i+1;   ram[i] = REG_BASE_ADDR                               ;  // reg base addr
782 
        i=i+1;   ram[i] = { `op_rd_i,   IO_LO_ADDR, `_, `_, `s1, `s0 };  // read (s1+offset) => s0
783 
        i=i+1;   ram[i] = { `op_rd_ix,  IO_HI_ADDR, `P, `P, `s1, `s0 };  // read (s1+offset) => s0, pop s1 & s0
784 
        i=i+1;   ram[i] = {  op_gto,                `P, `_, `s3, `s0 };  // return, pop s3
785 
 
786 
 
787 
        // sub : write s0 => 32 bit GPIO, return to (s3)
788 
        i='h930; ram[i] = {  op_lit_u,              `_, `_, `s0, `s1 };  // lit => s1
789 
        i=i+1;   ram[i] = REG_BASE_ADDR                               ;  // reg base addr
790 
        i=i+1;   ram[i] = { `op_wr_i,   IO_LO_ADDR, `_, `_, `s1, `s0 };  // write s0 => (s1+offset)
791 
        i=i+1;   ram[i] = { `op_wr_ix,  IO_HI_ADDR, `P, `_, `s1, `s0 };  // write s0 => (s1+offset), pop s1
792 
        i=i+1;   ram[i] = {  op_gto,                `P, `_, `s3, `s0 };  // return, pop s3
793 
 
794 
 
795 
        end

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