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[/] [diogenes/] [trunk/] [video/] [snake4.asm] - Blame information for rev 236

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@ l7: stack
@ l6: push_function
@ l0: return address of leavfuction (push pop im speziell)
 
  stio l0, [l0]
 
  LDL l0, :start
  LDL l6, :push
 
  ldi l7, 0x03
  jump 
  lsi l7, 0xfE
 
 
push:
  st  h7, [l7]
  adi l7, -1
  st  h1, [l7]
  adi l7, -1
  st  h2, [l7]
  adi l7, -1
  st  h3, [l7]
  adi l7, -1
  st  h4, [l7]
  adi l7, -1
  st  h5, [l7]
  adi l7, -1
  st  h6, [l7]
  adi l7, -1
  st  h0, [l7]
  jump 
  adi l7, -1
 
pop:
  adi l7, 1
  ld  h0, [l7]
  adi l7, 1
  ld  h6, [l7]
  adi l7, 1
  ld  h5, [l7]
  adi l7, 1
  ld  h4, [l7]
  adi l7, 1
  ld  h3, [l7]
  adi l7, 1
  ld  h2, [l7]
  adi l7, 1
  ld  h1, [l7]
  adi l7, 1
  ld  h7, [l7]
  nop
  nop
  jump 
  nop
 
 
start:
 
@ initialize vmem
  LDL   h4, :set_tile
  ldi   l3, 59     @ max y
hloop:
  ldi   l2, 79     @ max x
pixloop:
  call  h0, 
 ldi   l1, 0x5b
 
  brnz  l2, :pixloop
  adi   l2, -1
  brnz  l3, :hloop
  adi   l3, -1
 
 
@ draw "3D" borders
 ldi h6, 55
 ldi h7, 0xc1
 lsi h7, 0x02
 LDL h3, :border
 call h0, 
 ldi h4, 55
 
 ldi h6, 6
 ldi h7, 0xc1
 lsi h7, 0x3C
 call h0, 
 ldi h4, 17
 
 ldi h7, 0xc5
 call h0, 
 lsi h7, 0x3C
 
 ldi h7, 0xc9
 call h0, 
 lsi h7, 0x3C
 
 ldi h7, 0xcd
 call h0, 
 lsi h7, 0x3C
 
 ldi h6, 17
 ldi h7, 0xd4
 call h0, 
 lsi h7, 0x3C
 
@ draw static text
 ldi l0, 0xcA
 lsi l0, 0x44
 ldi l1, 0x57 @ X
 stio l1, [l0]
 ldi l0, 0xcE
 lsi l0, 0x44
 ldi l1, 0x58 @ Y
 stio l1, [l0]
 
@ LEVEL
 ldi l0, 0xc2
 lsi l0, 0x42
 ldi l1, 0x47
 stio l1, [l0]
 adi l0, 1
 ldi l1, 0x3c
 stio l1, [l0]
 adi l0, 1
 ldi l1, 0x55
 stio l1, [l0]
 adi l0, 1
 ldi l1, 0x3c
 stio l1, [l0]
 adi l0, 1
 ldi l1, 0x47
 stio l1, [l0]
 
@ LEVEL
 ldi l0, 0xc6
 lsi l0, 0x42
 ldi l1, 0x38
 stio l1, [l0]
 adi l0, 1
 ldi l1, 0x4b
 stio l1, [l0]
 adi l0, 1
 stio l1, [l0]
 adi l0, 1
 ldi l1, 0x47
 stio l1, [l0]
 adi l0, 1
 ldi l1, 0x3c
 stio l1, [l0]
 adi l0, 1
 ldi l1, 0xec
 stio l1, [l0]
 
 
 
@ Andreas
 ldi l0, 0xD5
 lsi l0, 0x3e
 ldi l1, 0x38 @ A
 stio l1, [l0]
 adi l0, 1
 ldi l1, 0x49
 stio l1, [l0]
 adi l0, 1
 ldi l1, 0x3b
 stio l1, [l0]
  adi l0, 1
 ldi l1, 0x4d
 stio l1, [l0]
  adi l0, 1
 ldi l1, 0x3c
 stio l1, [l0]
  adi l0, 1
 ldi l1, 0x38
 stio l1, [l0]
  adi l0, 1
 ldi l1, 0x4e
 stio l1, [l0]
 
 
@ David
 ldi l0, 0xD8
 lsi l0, 0x3e
 ldi l1, 0x3B @ D
 stio l1, [l0]
 adi l0, 1
 ldi l1, 0x38
 stio l1, [l0]
 adi l0, 1
 ldi l1, 0x55
 stio l1, [l0]
  adi l0, 1
 ldi l1, 0x44
 stio l1, [l0]
  adi l0, 1
 ldi l1, 0x3b
 stio l1, [l0]
 
@ Fellnhofer
 ldi l0, 0xD5
 lsi l0, 0xc1
 ldi l1, 0x3D
 stio l1, [l0]
 adi l0, 1
 ldi l1, 0x3c
 stio l1, [l0]
 adi l0, 1
 ldi l1, 0x47
 stio l1, [l0]
  adi l0, 1
 stio l1, [l0]
  adi l0, 1
 ldi l1, 0x49
 stio l1, [l0]
  adi l0, 1
 ldi l1, 0x3f
 stio l1, [l0]
  adi l0, 1
 ldi l1, 0x4a
 stio l1, [l0]
  adi l0, 1
 ldi l1, 0x3d
 stio l1, [l0]
  adi l0, 1
 ldi l1, 0x3c
 stio l1, [l0]
  adi l0, 1
 ldi l1, 0x4d
 stio l1, [l0]
 
@ Rigler
 ldi l0, 0xD8
 lsi l0, 0xc1
 ldi l1, 0x4d
 stio l1, [l0]
 adi l0, 1
 ldi l1, 0x44
 stio l1, [l0]
 adi l0, 1
 ldi l1, 0x3e
 stio l1, [l0]
  adi l0, 1
 ldi l1, 0x47
 stio l1, [l0]
  adi l0, 1
 ldi l1, 0x3c
 stio l1, [l0]
  adi l0, 1
 ldi l1, 0x4d
 stio l1, [l0]
 
@ &
 ldi l0, 0xD7
 lsi l0, 0x44
 ldi l1, 0x5c
 stio l1, [l0]
 
 
@ Diogenes
 ldi l0, 0xDB
 lsi l0, 0x3e
 ldi l1, 0x3b
 stio l1, [l0]
 adi l0, 1
 ldi l1, 0x44
 stio l1, [l0]
 adi l0, 1
 ldi l1, 0x4a
 stio l1, [l0]
  adi l0, 1
 ldi l1, 0x3e
 stio l1, [l0]
  adi l0, 1
 ldi l1, 0x3c
 stio l1, [l0]
  adi l0, 1
 ldi l1, 0x49
 stio l1, [l0]
  adi l0, 1
 ldi l1, 0x3c
 stio l1, [l0]
  adi l0, 1
 ldi l1, 0x4e
 stio l1, [l0]
 adi l0, 2
 ldi l1, 0x66
 stio l1, [l0]
  adi l0, 1
   ldi l1, 0x64
 stio l1, [l0]
  adi l0, 1
   ldi l1, 0x64
 stio l1, [l0]
  adi l0, 1
   ldi l1, 0x6c
 stio l1, [l0]
  adi l0, 1
 
 
 
@ initialize snake
  ldi   h3, 0x10
  lsi   h3, 0x10
  ldi   h1, 8
 
  @ first apple
  ldi   h6, 16
  lsi   h6, 40
 
  @ intitially nothing to grow
  ldi   h7, 0
 
l0:
  st    h3, [h1]
  brnz  h1, :l0
  adi   h1, -1
 
  ldi   h1, 8     @ head != tail to avoid early gameover
  adi   h3, 1
  st    h3, [h1]
 
  ldi   h1, 7
  ldi   h2, 0
 
  LDL   h3, :delay
  LDL   h5, :update
 
  ldi   l0, 0x00       @ loop expects key input in r0
loop:
  @ldi   l0, 0x00        @simulator: 0x81
  @ldio  l0, [l0]
  ldi   l1, 0x01
  and   l2, l0, l1     @ select bit for right
  sub   h2, h2, l2     @ add bit to direction
  shi   l0, -1         @ shift input
  and   l2, l0, l1
  add   h2, h2, l2     @ add bit to direction
 
  stio  h2, [l0]
 
  @shi   l0, -6         @ shift input
  @and   h4, l0, l1
 
 
@ check for game over
  adi  l1, h1, 1
  ld   l1, [l1]
  ldi   l0, 0xff
  lsi   l0, 0xff
  and  l1, l1, l0
  mov  l2, h1
  adi  l2, -2
 
collcheck:
  ld   l4, [l2]
  nop
  and  l4, l4, l0
  xor  l4, l4, l1
  brnz l4, :nocoll
  nop
 
@ GAME OVER
 ldi l0, 0xce
 lsi l0, 0x19
 ldi l1, 0x3e
 stio l1, [l0]
 adi l0, 1
 ldi l1, 0x38
 stio l1, [l0]
 adi l0, 1
 ldi l1, 0x48
 stio l1, [l0]
  adi l0, 1
 ldi l1, 0x3c
 stio l1, [l0]
  adi l0, 2
 ldi l1, 0x4a
 stio l1, [l0]
  adi l0, 1
 ldi l1, 0x55
 stio l1, [l0]
  adi l0, 1
 ldi l1, 0x3c
 stio l1, [l0]
 adi l0, 1
 ldi l1, 0x4d
 stio l1, [l0]
 
 
no_key_pressed:
 call  h0,        @ call delay
 ldi   l1, 30
 brz   l0, :no_key_pressed
 nop
 
 LDL   l0, :start
 jump  
 nop
 
nocoll:
  brnz l2, :collcheck
  adi  l2, -1
 
 
 
 
@ check for apple
  adi   l1, h1, 1
  ld    l1, [l1]
  ldi   l0, 0xff
  lsi   l0, 0xff
  xor   l1, l1, h6
  and   l1, l1, l0
  brnz  l1, :no_apple
  nop
  adi   h7, 8       @ grow by 8 for each apple
 
 
  @ FIXME: use random values
  ldi   l4, 53
  add   l0, h6, l4
  shi   h0, l0, -2
  add   l0, l0, h1
 
rand1:
  sub   l0, l0, l4
  cmpl  l1, l0, l4
  brz   l1, :rand1
  nop
 
rand2:
  sub   h0, h0, l4
  cmpl  l1, h0, l4
  brz   l1, :rand2
  nop
 
  adi   h0, 3
  adi   l0, 3
 
  mov   h6, l0
  shi   h6, 8
  or    h6, h6, h0
 
 
no_apple:
  ldi   l0, 0
  cmpl  h4, l0, h7
  sub   h7, h7, h4
 
 
@ draw apple
  ldi l0, 0xff
  and l2, h6, l0
  mov l3, h6
  shi l3, -8
  LDL l0, :set_tile
  call h0, 
  ldi l1, 0x06   @ apple
 
 
  @@ display level, apples
  LDL   l0, :print_val
  ldi l4, 0xc7
  mov l5, h1
  shi l5, -3
  call  h0, 
  lsi l4, 0x43
 
  LDL   l0, :print_val
  ldi l4, 0xc3
  mov l5, h1
  shi l5, -6
  call  h0, 
  lsi l4, 0x43
 
 
 
 
  call h0,         @ call update
  mov  l1, h2
 
  add   h1, h1, h4
 
  ldi   l1, 10         @ 2^20 steps
  mov   l2, h1
  shi   l2, -6
  shi   l2, 2
  call  h0,        @ call delay
  sub   l1, l1, l2
 
 
 
  brnz  h5, :loop
  nop
 
 
update:
  call l0, 
  nop
 
  brz   h4, :no_grow    @ if snake does not grow
  mov   l0, h1
  adi   l0, 2
  adi   h1, 1
  ld    l1, [h1]        @ if snake grows
  nop
  brnz  h4, :cloope
  mov   l2, h1
 
no_grow:
  ldi   l0, 0
  ld    l1, [l0]
 
  @ extract tile,y,x  (l1=tile, l2=x, l3=y)
  ldi   l4, 0xff
  and   l2, l1, l4
  shi   l1, -8
  and   l3, l1, l4
  ldi   l1, 0x1b
 
  LDL   l0, :set_tile
  call  h0, 
  nop
 
  ldi   l0, 0
  ldi   l2, 1
 
cloop:
  ld    l1, [l2]      @ src
  adi   l2, 1         @ src + 1
  st    l1, [l0]      @ dst
  cmpl  l3, l0, h1    @ until dst=highest address)
  brnz  l3, :cloop
  adi   l0, 1         @ dst + 1
cloope:
 
  ldi   l5, 3
  and   h2, h2, l5    @ trunc direction
 
  @ extract tile,y,x  (l1=tile, l2=x, l3=y)
  ldi   l4, 0xff
  and   l2, l1, l4
  shi   l1, -8
  and   l3, l1, l4
 
  shi   l1, -8        @ old direction
  shi   l1, 4         @ old direction << 2
  or    l1, l1, h2    @  00OO 00NN (old new combination)
  adi   l1, 4
 
  mov   h5, l0
  mov   h6, l2
  mov   h7, l3
 
  LDL   l4, :set_tile
  call  h0, 
  nop
  mov   l0, h5
  mov   l2, h6
  mov   l3, h7
 
down:
  xor   l4, h2, l5
  brnz  l4, :up
  nop
  adi   l3, 1
  ldi   l1, 8
up:
  ldi   l5, 1
  xor   l4, h2, l5
  brnz  l4, :right
  nop
  adi   l3, -1
  ldi   l1, 9
right:
  brnz  h2, :left
  ldi   l5, 2
  adi   l2, 1
  ldi   l1, 10
left:
  xor   l4, h2, l5
  brnz  l4, :end_key
  nop
  adi   l2, -1
  ldi   l1, 11
end_key:
 
  @ check for borders and wrap around
  ldi h0, 3
  cmpl l5, l2, h0
  brz l5, :b2
  nop
  ldi l2, 56
b2:
  cmpl l5, l3, h0
  brz l5, :b3
  nop
  ldi l3, 56
b3:
  ldi h0, 56
  cmpl l5, h0, l2
  brz l5, :b4
  nop
  ldi l2, 3
b4:
  cmpl l5, h0, l3
  brz l5, :bend
  nop
  ldi l3, 3
bend:
 
  mov   l4, h2
  shi   l4, 8
  or    l4, l4, l3
  shi   l4, 8
  or    l4, l4, l2
  st    l4, [l0]       @ write new head
 
  @@ keep x,y values
  mov   h2, l2
  mov   h3, l3
 
  LDL   l0, :set_tile
  call  h0, 
  nop
 
  @@ display x,y values
  LDL   h4, :print_val
 
  ldi l4, 0xcb
  mov l5, h2
  adi l5, -3
  call  h0, 
  lsi l4, 0x43
 
  ldi l4, 0xcf
  mov l5, h3
  adi l5, -3
  call  h0, 
  lsi l4, 0x43
 
 
 
  ldi   l0, 0
  ld    l1, [l0]
  @ extract tail tile,y,x  (l1=tile, l2=x, l3=y)
  ldi   l4, 0xff
  and   l2, l1, l4
  shi   l1, -8
  and   l3, l1, l4
  ldi   l0, 1
  ld    l1, [l0]
  nop
  shi   l1, -16        @ old direction
  adi   l1, 0x0c
 
  LDL   l0, :set_tile
  call  h0, 
  nop
 
  adi  h6, l6, 17
  jump 
  nop
 
 
set_stile:
  call l0, 
  nop
 
  ldi  l0, 0xff
  and  l2, l1, l0
  shi  l1, -8
  and  l3, l1, l0
 
  LDL  h4, :set_tile
  call h0, 
  shi  l1, -8
 
  adi  h6, l6, 17
  jump 
  nop
 
 
set_tile:
  call l0, 
  nop
 
  ldi   l4, 0xc0   @ vmem starts at 0xc000
  shi   l4, 8
 
  shi   h3, l3, 7
  add   l0, l2, h3
  add   l0, l0, l4
  stio  l1, [l0]
 
  adi  h6, l6, 17
  jump 
  nop
 
delay:
  call l0, 
  nop
  mov   l2, l1
  shi   l2, 16
  ldi   l4, 0xff
  shi   l4, 10
  ldi   l1, 0
  ldi   l0, 0
delay_loop:
  ldio  l3, [l1]
  ldi   l5, 0x0B              @ filter left, right, switch
  and   l3, l3, l5
  brz   l3, :goon
  nop
  brnz  l4, :goon2
  adi   l4, -1
  mov   l0, l3
goon:
  ldi   l4, 0xff
  shi   l4, 10
goon2:
  brnz  l2, :delay_loop
  adi   l2, -1
  adi  h6, l6, 17
  jump 
  nop
 
print_val:
  call l0, 
  nop
 
ldi h1, 100
pre_loop:
ldi h0, 0x63
add l5,l5,h1
count_loop:
sub l5,l5,h1
cmpl l0, l5, h1
brz l0, :count_loop
adi h0, 1
stio h0, [l4]
adi l4, 1
ldi l0, 10
xor l0,l0,h1
brnz l0, :pre_loop
ldi h1, 10
ldi h0, 0x64
add h0, h0, l5
stio h0, [l4]
 
 
  adi  h6, l6, 17
  jump 
  nop
 
border:
  call l0, 
  nop
 
  shi   h6, 7
  ldi   h5, 0x17
 fory:
   mov  l4, h4
   adi l5, h5, 2
 forx:
   add l3, h7, l4
   add l3,l3, h6
   stio  l5, [l3]
   adi l5, h5, 1
   brnz l4, :forx
   adi l4, -1
   stio h5, [l3]
   ldi l0,0x1d
   xor l0, l0, h5
   brz l0, :end_border
  ldi h5, 0x1a
  ldi l0, 0x80
  sub h6,h6,l0
  brnz h6, :fory
  nop
  brnz l0, :fory
  ldi h5, 0x1d
 
end_border:
  adi  h6, l6, 17
  jump 
  nop
 
 
stop
 

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Subversion Repositories diogenes

[/] [diogenes/] [trunk/] [video/] [snake4.asm] - Blame information for rev 236

`@ call delay`

`@ call update`

`@ call delay`

Line No.	Rev	Author	Line
1	220	fellnhofer	`@ l7: stack`
2			`@ l6: push_function`
3			`@ l0: return address of leavfuction (push pop im speziell)`
4
5			`stio l0, [l0]`
6
7			`LDL l0, :start`
8			`LDL l6, :push`
9
10			`ldi l7, 0x03`
11			`jump`
12			`lsi l7, 0xfE`
13
14
15			`push:`
16			`st h7, [l7]`
17			`adi l7, -1`
18			`st h1, [l7]`
19			`adi l7, -1`
20			`st h2, [l7]`
21			`adi l7, -1`
22			`st h3, [l7]`
23			`adi l7, -1`
24			`st h4, [l7]`
25			`adi l7, -1`
26			`st h5, [l7]`
27			`adi l7, -1`
28			`st h6, [l7]`
29			`adi l7, -1`
30			`st h0, [l7]`
31			`jump`
32			`adi l7, -1`
33
34			`pop:`
35			`adi l7, 1`
36			`ld h0, [l7]`
37			`adi l7, 1`
38			`ld h6, [l7]`
39			`adi l7, 1`
40			`ld h5, [l7]`
41			`adi l7, 1`
42			`ld h4, [l7]`
43			`adi l7, 1`
44			`ld h3, [l7]`
45			`adi l7, 1`
46			`ld h2, [l7]`
47			`adi l7, 1`
48			`ld h1, [l7]`
49			`adi l7, 1`
50			`ld h7, [l7]`
51			`nop`
52			`nop`
53			`jump`
54			`nop`
55
56
57			`start:`
58
59			`@ initialize vmem`
60			`LDL h4, :set_tile`
61			`ldi l3, 59 @ max y`
62			`hloop:`
63			`ldi l2, 79 @ max x`
64			`pixloop:`
65			`call h0,`
66			`ldi l1, 0x5b`
67
68			`brnz l2, :pixloop`
69			`adi l2, -1`
70			`brnz l3, :hloop`
71			`adi l3, -1`
72
73
74			`@ draw "3D" borders`
75			`ldi h6, 55`
76			`ldi h7, 0xc1`
77			`lsi h7, 0x02`
78			`LDL h3, :border`
79			`call h0,`
80			`ldi h4, 55`
81
82			`ldi h6, 6`
83			`ldi h7, 0xc1`
84			`lsi h7, 0x3C`
85			`call h0,`
86			`ldi h4, 17`
87
88			`ldi h7, 0xc5`
89			`call h0,`
90			`lsi h7, 0x3C`
91
92			`ldi h7, 0xc9`
93			`call h0,`
94			`lsi h7, 0x3C`
95
96			`ldi h7, 0xcd`
97			`call h0,`
98			`lsi h7, 0x3C`
99
100			`ldi h6, 17`
101			`ldi h7, 0xd4`
102			`call h0,`
103			`lsi h7, 0x3C`
104
105			`@ draw static text`
106			`ldi l0, 0xcA`
107			`lsi l0, 0x44`
108			`ldi l1, 0x57 @ X`
109			`stio l1, [l0]`
110			`ldi l0, 0xcE`
111			`lsi l0, 0x44`
112			`ldi l1, 0x58 @ Y`
113			`stio l1, [l0]`
114
115			`@ LEVEL`
116			`ldi l0, 0xc2`
117			`lsi l0, 0x42`
118			`ldi l1, 0x47`
119			`stio l1, [l0]`
120			`adi l0, 1`
121			`ldi l1, 0x3c`
122			`stio l1, [l0]`
123			`adi l0, 1`
124			`ldi l1, 0x55`
125			`stio l1, [l0]`
126			`adi l0, 1`
127			`ldi l1, 0x3c`
128			`stio l1, [l0]`
129			`adi l0, 1`
130			`ldi l1, 0x47`
131			`stio l1, [l0]`
132
133			`@ LEVEL`
134			`ldi l0, 0xc6`
135			`lsi l0, 0x42`
136			`ldi l1, 0x38`
137			`stio l1, [l0]`
138			`adi l0, 1`
139			`ldi l1, 0x4b`
140			`stio l1, [l0]`
141			`adi l0, 1`
142			`stio l1, [l0]`
143			`adi l0, 1`
144			`ldi l1, 0x47`
145			`stio l1, [l0]`
146			`adi l0, 1`
147			`ldi l1, 0x3c`
148			`stio l1, [l0]`
149			`adi l0, 1`
150			`ldi l1, 0xec`
151			`stio l1, [l0]`
152
153
154
155			`@ Andreas`
156			`ldi l0, 0xD5`
157			`lsi l0, 0x3e`
158			`ldi l1, 0x38 @ A`
159			`stio l1, [l0]`
160			`adi l0, 1`
161			`ldi l1, 0x49`
162			`stio l1, [l0]`
163			`adi l0, 1`
164			`ldi l1, 0x3b`
165			`stio l1, [l0]`
166			`adi l0, 1`
167			`ldi l1, 0x4d`
168			`stio l1, [l0]`
169			`adi l0, 1`
170			`ldi l1, 0x3c`
171			`stio l1, [l0]`
172			`adi l0, 1`
173			`ldi l1, 0x38`
174			`stio l1, [l0]`
175			`adi l0, 1`
176			`ldi l1, 0x4e`
177			`stio l1, [l0]`
178
179
180			`@ David`
181			`ldi l0, 0xD8`
182			`lsi l0, 0x3e`
183			`ldi l1, 0x3B @ D`
184			`stio l1, [l0]`
185			`adi l0, 1`
186			`ldi l1, 0x38`
187			`stio l1, [l0]`
188			`adi l0, 1`
189			`ldi l1, 0x55`
190			`stio l1, [l0]`
191			`adi l0, 1`
192			`ldi l1, 0x44`
193			`stio l1, [l0]`
194			`adi l0, 1`
195			`ldi l1, 0x3b`
196			`stio l1, [l0]`
197
198			`@ Fellnhofer`
199			`ldi l0, 0xD5`
200			`lsi l0, 0xc1`
201			`ldi l1, 0x3D`
202			`stio l1, [l0]`
203			`adi l0, 1`
204			`ldi l1, 0x3c`
205			`stio l1, [l0]`
206			`adi l0, 1`
207			`ldi l1, 0x47`
208			`stio l1, [l0]`
209			`adi l0, 1`
210			`stio l1, [l0]`
211			`adi l0, 1`
212			`ldi l1, 0x49`
213			`stio l1, [l0]`
214			`adi l0, 1`
215			`ldi l1, 0x3f`
216			`stio l1, [l0]`
217			`adi l0, 1`
218			`ldi l1, 0x4a`
219			`stio l1, [l0]`
220			`adi l0, 1`
221			`ldi l1, 0x3d`
222			`stio l1, [l0]`
223			`adi l0, 1`
224			`ldi l1, 0x3c`
225			`stio l1, [l0]`
226			`adi l0, 1`
227			`ldi l1, 0x4d`
228			`stio l1, [l0]`
229
230			`@ Rigler`
231			`ldi l0, 0xD8`
232			`lsi l0, 0xc1`
233			`ldi l1, 0x4d`
234			`stio l1, [l0]`
235			`adi l0, 1`
236			`ldi l1, 0x44`
237			`stio l1, [l0]`
238			`adi l0, 1`
239			`ldi l1, 0x3e`
240			`stio l1, [l0]`
241			`adi l0, 1`
242			`ldi l1, 0x47`
243			`stio l1, [l0]`
244			`adi l0, 1`
245			`ldi l1, 0x3c`
246			`stio l1, [l0]`
247			`adi l0, 1`
248			`ldi l1, 0x4d`
249			`stio l1, [l0]`
250
251			`@ &`
252			`ldi l0, 0xD7`
253			`lsi l0, 0x44`
254			`ldi l1, 0x5c`
255			`stio l1, [l0]`
256
257
258			`@ Diogenes`
259			`ldi l0, 0xDB`
260			`lsi l0, 0x3e`
261			`ldi l1, 0x3b`
262			`stio l1, [l0]`
263			`adi l0, 1`
264			`ldi l1, 0x44`
265			`stio l1, [l0]`
266			`adi l0, 1`
267			`ldi l1, 0x4a`
268			`stio l1, [l0]`
269			`adi l0, 1`
270			`ldi l1, 0x3e`
271			`stio l1, [l0]`
272			`adi l0, 1`
273			`ldi l1, 0x3c`
274			`stio l1, [l0]`
275			`adi l0, 1`
276			`ldi l1, 0x49`
277			`stio l1, [l0]`
278			`adi l0, 1`
279			`ldi l1, 0x3c`
280			`stio l1, [l0]`
281			`adi l0, 1`
282			`ldi l1, 0x4e`
283			`stio l1, [l0]`
284			`adi l0, 2`
285			`ldi l1, 0x66`
286			`stio l1, [l0]`
287			`adi l0, 1`
288			`ldi l1, 0x64`
289			`stio l1, [l0]`
290			`adi l0, 1`
291			`ldi l1, 0x64`
292			`stio l1, [l0]`
293			`adi l0, 1`
294			`ldi l1, 0x6c`
295			`stio l1, [l0]`
296			`adi l0, 1`
297
298
299
300			`@ initialize snake`
301			`ldi h3, 0x10`
302			`lsi h3, 0x10`
303			`ldi h1, 8`
304
305			`@ first apple`
306			`ldi h6, 16`
307			`lsi h6, 40`
308
309			`@ intitially nothing to grow`
310			`ldi h7, 0`
311
312			`l0:`
313			`st h3, [h1]`
314			`brnz h1, :l0`
315			`adi h1, -1`
316
317			`ldi h1, 8 @ head != tail to avoid early gameover`
318			`adi h3, 1`
319			`st h3, [h1]`
320
321			`ldi h1, 7`
322			`ldi h2, 0`
323
324			`LDL h3, :delay`
325			`LDL h5, :update`
326
327			`ldi l0, 0x00 @ loop expects key input in r0`
328			`loop:`
329			`@ldi l0, 0x00 @simulator: 0x81`
330			`@ldio l0, [l0]`
331			`ldi l1, 0x01`
332			`and l2, l0, l1 @ select bit for right`
333			`sub h2, h2, l2 @ add bit to direction`
334			`shi l0, -1 @ shift input`
335			`and l2, l0, l1`
336			`add h2, h2, l2 @ add bit to direction`
337
338			`stio h2, [l0]`
339
340			`@shi l0, -6 @ shift input`
341			`@and h4, l0, l1`
342
343
344			`@ check for game over`
345			`adi l1, h1, 1`
346			`ld l1, [l1]`
347			`ldi l0, 0xff`
348			`lsi l0, 0xff`
349			`and l1, l1, l0`
350			`mov l2, h1`
351			`adi l2, -2`
352
353			`collcheck:`
354			`ld l4, [l2]`
355			`nop`
356			`and l4, l4, l0`
357			`xor l4, l4, l1`
358			`brnz l4, :nocoll`
359			`nop`
360
361			`@ GAME OVER`
362			`ldi l0, 0xce`
363			`lsi l0, 0x19`
364			`ldi l1, 0x3e`
365			`stio l1, [l0]`
366			`adi l0, 1`
367			`ldi l1, 0x38`
368			`stio l1, [l0]`
369			`adi l0, 1`
370			`ldi l1, 0x48`
371			`stio l1, [l0]`
372			`adi l0, 1`
373			`ldi l1, 0x3c`
374			`stio l1, [l0]`
375			`adi l0, 2`
376			`ldi l1, 0x4a`
377			`stio l1, [l0]`
378			`adi l0, 1`
379			`ldi l1, 0x55`
380			`stio l1, [l0]`
381			`adi l0, 1`
382			`ldi l1, 0x3c`
383			`stio l1, [l0]`
384			`adi l0, 1`
385			`ldi l1, 0x4d`
386			`stio l1, [l0]`
387
388
389			`no_key_pressed:`
390			`call h0,` `@ call delay`
391			`ldi l1, 30`
392			`brz l0, :no_key_pressed`
393			`nop`
394
395			`LDL l0, :start`
396			`jump`
397			`nop`
398
399			`nocoll:`
400			`brnz l2, :collcheck`
401			`adi l2, -1`
402
403
404
405
406			`@ check for apple`
407			`adi l1, h1, 1`
408			`ld l1, [l1]`
409			`ldi l0, 0xff`
410			`lsi l0, 0xff`
411			`xor l1, l1, h6`
412			`and l1, l1, l0`
413			`brnz l1, :no_apple`
414			`nop`
415			`adi h7, 8 @ grow by 8 for each apple`
416
417
418			`@ FIXME: use random values`
419			`ldi l4, 53`
420			`add l0, h6, l4`
421			`shi h0, l0, -2`
422			`add l0, l0, h1`
423
424			`rand1:`
425			`sub l0, l0, l4`
426			`cmpl l1, l0, l4`
427			`brz l1, :rand1`
428			`nop`
429
430			`rand2:`
431			`sub h0, h0, l4`
432			`cmpl l1, h0, l4`
433			`brz l1, :rand2`
434			`nop`
435
436			`adi h0, 3`
437			`adi l0, 3`
438
439			`mov h6, l0`
440			`shi h6, 8`
441			`or h6, h6, h0`
442
443
444			`no_apple:`
445			`ldi l0, 0`
446			`cmpl h4, l0, h7`
447			`sub h7, h7, h4`
448
449
450			`@ draw apple`
451			`ldi l0, 0xff`
452			`and l2, h6, l0`
453			`mov l3, h6`
454			`shi l3, -8`
455			`LDL l0, :set_tile`
456			`call h0,`
457			`ldi l1, 0x06 @ apple`
458
459
460			`@@ display level, apples`
461			`LDL l0, :print_val`
462			`ldi l4, 0xc7`
463			`mov l5, h1`
464			`shi l5, -3`
465			`call h0,`
466			`lsi l4, 0x43`
467
468			`LDL l0, :print_val`
469			`ldi l4, 0xc3`
470			`mov l5, h1`
471			`shi l5, -6`
472			`call h0,`
473			`lsi l4, 0x43`
474
475
476
477
478			`call h0,` `@ call update`
479			`mov l1, h2`
480
481			`add h1, h1, h4`
482
483			`ldi l1, 10 @ 2^20 steps`
484			`mov l2, h1`
485			`shi l2, -6`
486			`shi l2, 2`
487			`call h0,` `@ call delay`
488			`sub l1, l1, l2`
489
490
491
492			`brnz h5, :loop`
493			`nop`
494
495
496			`update:`
497			`call l0,`
498			`nop`
499
500			`brz h4, :no_grow @ if snake does not grow`
501			`mov l0, h1`
502			`adi l0, 2`
503			`adi h1, 1`
504			`ld l1, [h1] @ if snake grows`
505			`nop`
506			`brnz h4, :cloope`
507			`mov l2, h1`
508
509			`no_grow:`
510			`ldi l0, 0`
511			`ld l1, [l0]`
512
513			`@ extract tile,y,x (l1=tile, l2=x, l3=y)`
514			`ldi l4, 0xff`
515			`and l2, l1, l4`
516			`shi l1, -8`
517			`and l3, l1, l4`
518			`ldi l1, 0x1b`
519
520			`LDL l0, :set_tile`
521			`call h0,`
522			`nop`
523
524			`ldi l0, 0`
525			`ldi l2, 1`
526
527			`cloop:`
528			`ld l1, [l2] @ src`
529			`adi l2, 1 @ src + 1`
530			`st l1, [l0] @ dst`
531			`cmpl l3, l0, h1 @ until dst=highest address)`
532			`brnz l3, :cloop`
533			`adi l0, 1 @ dst + 1`
534			`cloope:`
535
536			`ldi l5, 3`
537			`and h2, h2, l5 @ trunc direction`
538
539			`@ extract tile,y,x (l1=tile, l2=x, l3=y)`
540			`ldi l4, 0xff`
541			`and l2, l1, l4`
542			`shi l1, -8`
543			`and l3, l1, l4`
544
545			`shi l1, -8 @ old direction`
546			`shi l1, 4 @ old direction << 2`
547			`or l1, l1, h2 @ 00OO 00NN (old new combination)`
548			`adi l1, 4`
549
550			`mov h5, l0`
551			`mov h6, l2`
552			`mov h7, l3`
553
554			`LDL l4, :set_tile`
555			`call h0,`
556			`nop`
557			`mov l0, h5`
558			`mov l2, h6`
559			`mov l3, h7`
560
561			`down:`
562			`xor l4, h2, l5`
563			`brnz l4, :up`
564			`nop`
565			`adi l3, 1`
566			`ldi l1, 8`
567			`up:`
568			`ldi l5, 1`
569			`xor l4, h2, l5`
570			`brnz l4, :right`
571			`nop`
572			`adi l3, -1`
573			`ldi l1, 9`
574			`right:`
575			`brnz h2, :left`
576			`ldi l5, 2`
577			`adi l2, 1`
578			`ldi l1, 10`
579			`left:`
580			`xor l4, h2, l5`
581			`brnz l4, :end_key`
582			`nop`
583			`adi l2, -1`
584			`ldi l1, 11`
585			`end_key:`
586
587			`@ check for borders and wrap around`
588			`ldi h0, 3`
589			`cmpl l5, l2, h0`
590			`brz l5, :b2`
591			`nop`
592			`ldi l2, 56`
593			`b2:`
594			`cmpl l5, l3, h0`
595			`brz l5, :b3`
596			`nop`
597			`ldi l3, 56`
598			`b3:`
599			`ldi h0, 56`
600			`cmpl l5, h0, l2`
601			`brz l5, :b4`
602			`nop`
603			`ldi l2, 3`
604			`b4:`
605			`cmpl l5, h0, l3`
606			`brz l5, :bend`
607			`nop`
608			`ldi l3, 3`
609			`bend:`
610
611			`mov l4, h2`
612			`shi l4, 8`
613			`or l4, l4, l3`
614			`shi l4, 8`
615			`or l4, l4, l2`
616			`st l4, [l0] @ write new head`
617
618			`@@ keep x,y values`
619			`mov h2, l2`
620			`mov h3, l3`
621
622			`LDL l0, :set_tile`
623			`call h0,`
624			`nop`
625
626			`@@ display x,y values`
627			`LDL h4, :print_val`
628
629			`ldi l4, 0xcb`
630			`mov l5, h2`
631			`adi l5, -3`
632			`call h0,`
633			`lsi l4, 0x43`
634
635			`ldi l4, 0xcf`
636			`mov l5, h3`
637			`adi l5, -3`
638			`call h0,`
639			`lsi l4, 0x43`
640
641
642
643			`ldi l0, 0`
644			`ld l1, [l0]`
645			`@ extract tail tile,y,x (l1=tile, l2=x, l3=y)`
646			`ldi l4, 0xff`
647			`and l2, l1, l4`
648			`shi l1, -8`
649			`and l3, l1, l4`
650			`ldi l0, 1`
651			`ld l1, [l0]`
652			`nop`
653			`shi l1, -16 @ old direction`
654			`adi l1, 0x0c`
655
656			`LDL l0, :set_tile`
657			`call h0,`
658			`nop`
659
660			`adi h6, l6, 17`
661			`jump`
662			`nop`
663
664
665			`set_stile:`
666			`call l0,`
667			`nop`
668
669			`ldi l0, 0xff`
670			`and l2, l1, l0`
671			`shi l1, -8`
672			`and l3, l1, l0`
673
674			`LDL h4, :set_tile`
675			`call h0,`
676			`shi l1, -8`
677
678			`adi h6, l6, 17`
679			`jump`
680			`nop`
681
682
683			`set_tile:`
684			`call l0,`
685			`nop`
686
687			`ldi l4, 0xc0 @ vmem starts at 0xc000`
688			`shi l4, 8`
689
690			`shi h3, l3, 7`
691			`add l0, l2, h3`
692			`add l0, l0, l4`
693			`stio l1, [l0]`
694
695			`adi h6, l6, 17`
696			`jump`
697			`nop`
698
699			`delay:`
700			`call l0,`
701			`nop`
702			`mov l2, l1`
703			`shi l2, 16`
704			`ldi l4, 0xff`
705			`shi l4, 10`
706			`ldi l1, 0`
707			`ldi l0, 0`
708			`delay_loop:`
709			`ldio l3, [l1]`
710			`ldi l5, 0x0B @ filter left, right, switch`
711			`and l3, l3, l5`
712			`brz l3, :goon`
713			`nop`
714			`brnz l4, :goon2`
715			`adi l4, -1`
716			`mov l0, l3`
717			`goon:`
718			`ldi l4, 0xff`
719			`shi l4, 10`
720			`goon2:`
721			`brnz l2, :delay_loop`
722			`adi l2, -1`
723			`adi h6, l6, 17`
724			`jump`
725			`nop`
726
727			`print_val:`
728			`call l0,`
729			`nop`
730
731			`ldi h1, 100`
732			`pre_loop:`
733			`ldi h0, 0x63`
734			`add l5,l5,h1`
735			`count_loop:`
736			`sub l5,l5,h1`
737			`cmpl l0, l5, h1`
738			`brz l0, :count_loop`
739			`adi h0, 1`
740			`stio h0, [l4]`
741			`adi l4, 1`
742			`ldi l0, 10`
743			`xor l0,l0,h1`
744			`brnz l0, :pre_loop`
745			`ldi h1, 10`
746			`ldi h0, 0x64`
747			`add h0, h0, l5`
748			`stio h0, [l4]`
749
750
751			`adi h6, l6, 17`
752			`jump`
753			`nop`
754
755			`border:`
756			`call l0,`
757			`nop`
758
759			`shi h6, 7`
760			`ldi h5, 0x17`
761			`fory:`
762			`mov l4, h4`
763			`adi l5, h5, 2`
764			`forx:`
765			`add l3, h7, l4`
766			`add l3,l3, h6`
767			`stio l5, [l3]`
768			`adi l5, h5, 1`
769			`brnz l4, :forx`
770			`adi l4, -1`
771			`stio h5, [l3]`
772			`ldi l0,0x1d`
773			`xor l0, l0, h5`
774			`brz l0, :end_border`
775			`ldi h5, 0x1a`
776			`ldi l0, 0x80`
777			`sub h6,h6,l0`
778			`brnz h6, :fory`
779			`nop`
780			`brnz l0, :fory`
781			`ldi h5, 0x1d`
782
783			`end_border:`
784			`adi h6, l6, 17`
785			`jump`
786			`nop`
787
788
789			`stop`
790