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`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// IBM 650 Reconstruction in Verilog (i650)
// 
// This file is part of the IBM 650 Reconstruction in Verilog (i650) project
// http:////www.opencores.org/project,i650
//
// Description: Operator console and external control interface.
// 
// Additional Comments: See US 2959351, Fig. 75, 76, 76 and 77. Also implements
//  a simple command-based control interface.
//
// Copyright (c) 2015 Robert Abeles
//
// This source file is free software; you can redistribute it
// and/or modify it under the terms of the GNU Lesser General
// Public License as published by the Free Software Foundation;
// either version 2.1 of the License, or (at your option) any
// later version.
//
// This source is distributed in the hope that it will be
// useful, but WITHOUT ANY WARRANTY; without even the implied
// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
// PURPOSE.  See the GNU Lesser General Public License for more
// details.
//
// You should have received a copy of the GNU Lesser General
// Public License along with this source; if not, download it
// from http://www.opencores.org/lgpl.shtml
//////////////////////////////////////////////////////////////////////////////////
`include "defines.v"
 
module operator_ctl (
      input rst, clk,
      input ap, dp,
      input dx, d0, d1, d2, d3, d4, d5, d6, d9, d10,
      input wu, wl, hp,
      input [0:3] early_idx, ontime_idx,
 
      input [0:6] cmd_digit_in, io_buffer_in, gs_in, acc_ontime, dist_ontime,
                  prog_ontime,
      input [0:5] command,
      input restart_reset,
 
      output reg[0:6] data_out, addr_out, console_out,
      output [0:6] display_digit,
      output reg console_to_addr, acc_ri_console,
      output reg[0:14] gs_ram_addr,
      output reg read_gs, write_gs,
      output reg pgm_start, pgm_stop, err_reset, err_sense_reset,
      output run_control, half_or_pgm_stop, ri_storage, ro_storage,
             storage_control,
      output reg man_pgm_reset, man_acc_reset, hard_reset,
      output set_8000, reset_8000,
 
      output reg[0:6] cmd_digit_out,
      output reg busy, digit_ready, restart_reset_busy,
      output reg punch_card, read_card, card_digit_ready
   );
 
   //-----------------------------------------------------------------------------
   // Operator console switch settings and their control signals.
   //-----------------------------------------------------------------------------
   reg pgm_sw_stop, pgm_sw_run,
       half_cycle_sw_run, half_cycle_sw_half,
       ctl_sw_addr_stop, ctl_sw_run, ctl_sw_manual,
       disp_sw_lacc, disp_sw_uacc, disp_sw_dist, disp_sw_pgm,
       disp_sw_ri, disp_sw_ro,
       ovflw_sw_stop, ovflw_sw_sense, err_sw_stop, err_sw_sense;
   reg [0:6] storage_entry_sw [0:15];
   reg [0:6] addr_sel_sw [0:3];
   assign run_control = disp_sw_lacc | disp_sw_uacc | disp_sw_dist | disp_sw_pgm;
   assign half_or_pgm_stop = half_cycle_sw_half | pgm_stop;
   assign ri_storage = disp_sw_ri;
   assign ro_storage = disp_sw_ro;
   assign storage_control = run_control | disp_sw_ro;
   assign display_digit = (disp_sw_lacc | disp_sw_uacc)? acc_ontime
                        : (disp_sw_dist | disp_sw_ri | disp_sw_ro)? dist_ontime
                        : disp_sw_pgm? prog_ontime
                        : `biq_blank;
   assign set_8000 = man_pgm_reset & (ctl_sw_addr_stop | ctl_sw_run);
   assign reset_8000 = man_pgm_reset & ctl_sw_manual;
 
   //-----------------------------------------------------------------------------
   // Calculate the RAM address of the general storage word at address gs_addr_.
   //-----------------------------------------------------------------------------
   reg [0:6] gs_addr_th, gs_addr_h, gs_addr_t, gs_addr_u;
   wire [0:14] gs_band_addr;
   wire [0:9] gs_word_offset;
   ram_band_addr rba(gs_addr_th, gs_addr_h, gs_addr_t, gs_band_addr);
   ram_word_offset rwo(gs_addr_t, gs_addr_u, gs_word_offset);
   wire [0:14] gs_word_addr = gs_band_addr + gs_word_offset;
 
   //-----------------------------------------------------------------------------
   // Operator console state machine
   //-----------------------------------------------------------------------------
   reg do_power_on_reset, do_reset_console, do_err_reset, do_err_sense_reset,
       do_pgm_reset, do_acc_reset, do_hard_reset, do_clear_drum;
   reg [0:5] state;
 
   `define state_idle                  6'd0
 
   `define state_reset_console_1       6'd1
   `define state_reset_console_2       6'd2
   `define state_pgm_reset_1           6'd3
   `define state_pgm_reset_2           6'd4
   `define state_acc_reset_1           6'd5
   `define state_acc_reset_2           6'd6
   `define state_err_reset_1           6'd7
   `define state_err_reset_2           6'd8
   `define state_err_sense_reset_1     6'd9
   `define state_err_sense_reset_2     6'd10
   `define state_hard_reset_1          6'd11
 
   `define state_storage_entry_sw_1    6'd12
   `define state_storage_entry_sw_2    6'd13
   `define state_addr_sel_sw_1         6'd14
   `define state_addr_sel_sw_2         6'd15
 
   `define state_xfer_key_1            6'd16
   `define state_xfer_key_2            6'd17
   `define state_pgm_start_key_1       6'd18
   `define state_pgm_start_key_2       6'd19
   `define state_pgm_stop_key_1        6'd20
   `define state_pgm_stop_key_2        6'd21
 
   `define state_read_gs_1             6'd30
   `define state_read_gs_2             6'd31
   `define state_read_gs_3             6'd32
   `define state_read_gs_4             6'd33
   `define state_read_gs_5             6'd34
   `define state_read_gs_6             6'd35
   `define state_write_gs_1            6'd36
   `define state_write_gs_2            6'd37
   `define state_write_gs_3            6'd38
   `define state_write_gs_4            6'd39
   `define state_write_gs_5            6'd40
   `define state_read_acc_1            6'd41
   `define state_read_acc_2            6'd42
   `define state_read_acc_3            6'd43
   `define state_read_dist_1           6'd44
   `define state_read_dist_2           6'd45
   `define state_read_dist_3           6'd46
   `define state_read_prog_1           6'd47
   `define state_read_prog_2           6'd48
   `define state_read_prog_3           6'd49
   `define state_write_acc_1           6'd50
   `define state_write_acc_2           6'd51
   `define state_write_acc_3           6'd52
   `define state_clear_drum_1          6'd53
   `define state_clear_drum_2          6'd54
   `define state_clear_drum_3          6'd55
   `define state_load_gs_1             6'd56
   `define state_load_gs_2             6'd57
   `define state_dump_gs_1             6'd58
   `define state_dump_gs_2             6'd59
   `define state_dump_gs_3             6'd60
   `define state_dump_gs_4             6'd61
 
   always @(posedge clk)
      if (rst) begin
         console_to_addr  <= 0;
         pgm_start        <= 0;
         pgm_stop         <= 0;
         err_reset        <= 0;
         err_sense_reset  <= 0;
         man_pgm_reset    <= 0;
         man_acc_reset    <= 0;
         hard_reset       <= 0;
 
         // reset console switches
         pgm_sw_stop      <= 0;
         pgm_sw_run       <= 1;
         half_cycle_sw_run <= 1;
         half_cycle_sw_half <= 0;
         ctl_sw_addr_stop <= 0;
         ctl_sw_run       <= 1;
         ctl_sw_manual    <= 0;
         disp_sw_lacc     <= 0;
         disp_sw_uacc     <= 0;
         disp_sw_dist     <= 1;
         disp_sw_pgm      <= 0;
         disp_sw_ri       <= 0;
         disp_sw_ro       <= 0;
         ovflw_sw_stop    <= 1;
         ovflw_sw_sense   <= 0;
         err_sw_stop      <= 1;
         err_sw_sense     <= 0;
 
         state         <= `state_idle;
         busy          <= 1;
         digit_ready   <= 0;
         cmd_digit_out <= `biq_blank;
         restart_reset_busy <= 0;
 
         do_power_on_reset  <= 1;
         do_reset_console   <= 0;
         do_err_reset       <= 0;
         do_err_sense_reset <= 0;
         do_pgm_reset       <= 0;
         do_acc_reset       <= 0;
         do_hard_reset      <= 0;
         do_clear_drum      <= 0;
 
         gs_ram_addr        <= 15'd0;
         read_gs            <= 0;
         write_gs           <= 0;
         acc_ri_console     <= 0;
         console_out        <= `biq_blank;
      end else if (dp) begin
         case (state)
            `state_idle: begin
               case (command)
                  `cmd_none: begin
                     if (restart_reset) begin
                        do_pgm_reset       <= 1;
                        do_acc_reset       <= 1;
                        do_err_reset       <= 1;
                        restart_reset_busy <= 1;
                     end else if (do_power_on_reset) begin
                        do_power_on_reset  <= 0;
                        do_reset_console   <= 1;
                        do_pgm_reset       <= 1;
                        do_acc_reset       <= 1;
                        do_err_reset       <= 1;
                        do_err_sense_reset <= 1;
                        do_hard_reset      <= 1;
                        do_clear_drum      <= 1;
                     end else if (do_hard_reset) begin
                        do_hard_reset      <= 0;
                        hard_reset         <= 1;
                        state <= `state_hard_reset_1;
                     end else if (do_reset_console) begin
                        do_reset_console   <= 0;
                        state <= `state_reset_console_1;
                     end else if (do_pgm_reset) begin
                        do_pgm_reset       <= 0;
                        state <= `state_pgm_reset_1;
                     end else if (do_acc_reset) begin
                        do_acc_reset       <= 0;
                        man_acc_reset      <= 1;
                        state <= `state_acc_reset_1;
                     end else if (do_err_reset) begin
                        do_err_reset       <= 0;
                        err_reset          <= 1;
                        state <= `state_err_reset_1;
                     end else if (do_err_sense_reset) begin
                        do_err_sense_reset <= 0;
                        err_sense_reset    <= 1;
                        state <= `state_err_sense_reset_1;
                     end else if (do_clear_drum) begin
                        do_clear_drum      <= 0;
                        state <= `state_clear_drum_1;
                     end else begin
                        busy <= 0;
                        digit_ready <= 0;
                        restart_reset_busy <= 0;
                     end
                  end
 
                  `cmd_pgm_sw_stop: begin
                     busy <= 1;
                     pgm_sw_stop <= 1;
                     pgm_sw_run  <= 0;
                  end
 
                  `cmd_pgm_sw_run: begin
                     busy <= 1;
                     pgm_sw_stop <= 0;
                     pgm_sw_run  <= 1;
                  end
 
                  `cmd_half_cycle_sw_run: begin
                     busy <= 1;
                     half_cycle_sw_run  <= 1;
                     half_cycle_sw_half <= 0;
                  end
 
                  `cmd_half_cycle_sw_half: begin
                     busy <= 1;
                     half_cycle_sw_run  <= 0;
                     half_cycle_sw_half <= 1;
                  end
 
                  `cmd_ctl_sw_addr_stop: begin
                     busy <= 1;
                     ctl_sw_addr_stop <= 1;
                     ctl_sw_run       <= 0;
                     ctl_sw_manual    <= 0;
                  end
 
                  `cmd_ctl_sw_run: begin
                     busy <= 1;
                     ctl_sw_addr_stop <= 0;
                     ctl_sw_run       <= 1;
                     ctl_sw_manual    <= 0;
                  end
 
                  `cmd_ctl_sw_manual: begin
                     busy <= 1;
                     ctl_sw_addr_stop <= 0;
                     ctl_sw_run       <= 0;
                     ctl_sw_manual    <= 1;
                  end
 
                  `cmd_disp_sw_lacc: begin
                     busy <= 1;
                     disp_sw_lacc <= 1;
                     disp_sw_uacc <= 0;
                     disp_sw_dist <= 0;
                     disp_sw_pgm  <= 0;
                     disp_sw_ri   <= 0;
                     disp_sw_ro   <= 0;
                  end
 
                  `cmd_disp_sw_uacc: begin
                     busy <= 1;
                     disp_sw_lacc <= 0;
                     disp_sw_uacc <= 1;
                     disp_sw_dist <= 0;
                     disp_sw_pgm <= 0;
                     disp_sw_ri   <= 0;
                     disp_sw_ro   <= 0;
                  end
 
                  `cmd_disp_sw_dist: begin
                     busy <= 1;
                     disp_sw_lacc <= 0;
                     disp_sw_uacc <= 0;
                     disp_sw_dist <= 1;
                     disp_sw_pgm <= 0;
                     disp_sw_ri   <= 0;
                     disp_sw_ro   <= 0;
                  end
 
                  `cmd_disp_sw_prog: begin
                     busy <= 1;
                     disp_sw_lacc <= 0;
                     disp_sw_uacc <= 0;
                     disp_sw_dist <= 0;
                     disp_sw_pgm <= 1;
                     disp_sw_ri   <= 0;
                     disp_sw_ro   <= 0;
                  end
 
                  `cmd_disp_sw_ri: begin
                     busy <= 1;
                     disp_sw_lacc <= 0;
                     disp_sw_uacc <= 0;
                     disp_sw_dist <= 0;
                     disp_sw_pgm <= 0;
                     disp_sw_ri   <= 1;
                     disp_sw_ro   <= 0;
                  end
 
                  `cmd_disp_sw_ro: begin
                     busy <= 1;
                     disp_sw_lacc <= 0;
                     disp_sw_uacc <= 0;
                     disp_sw_dist <= 0;
                     disp_sw_pgm <= 0;
                     disp_sw_ri   <= 0;
                     disp_sw_ro   <= 1;
                  end
 
                  `cmd_ovflw_sw_stop: begin
                     busy <= 1;
                     ovflw_sw_stop  <= 1;
                     ovflw_sw_sense <= 0;
                  end
 
                  `cmd_ovflw_sw_sense: begin
                     busy <= 1;
                     ovflw_sw_stop  <= 0;
                     ovflw_sw_sense <= 1;
                  end
 
                  `cmd_err_sw_stop: begin
                     busy <= 1;
                     err_sw_stop  <= 1;
                     err_sw_sense <= 0;
                  end
 
                  `cmd_err_sw_sense: begin
                     busy <= 1;
                     err_sw_stop  <= 0;
                     err_sw_sense <= 1;
                  end
 
                  `cmd_storage_entry_sw: begin
                     busy <= 1;
                     state <= `state_storage_entry_sw_1;
                  end
 
                  `cmd_addr_sel_sw: begin
                     busy <= 1;
                     state <= `state_addr_sel_sw_1;
                  end
 
                  `cmd_xfer_key: begin
                     if (ctl_sw_manual) begin
                        busy <= 1;
                        state <= `state_xfer_key_1;
                     end
                  end
 
                  `cmd_pgm_start_key: begin
                     busy <= 1;
                     state <= `state_pgm_start_key_1;
                  end
 
                  `cmd_pgm_stop_key: begin
                     busy <= 1;
                     pgm_stop <= 1;
                     state <= `state_pgm_stop_key_1;
                  end
 
                  `cmd_pgm_reset_key: begin
                     busy <= 1;
                     do_pgm_reset <= 1;
                     do_err_reset <= 1;
                  end
 
                  `cmd_comp_reset_key: begin
                     busy <= 1;
                     do_pgm_reset <= 1;
                     do_acc_reset <= 1;
                     do_err_reset <= 1;
                  end
 
                  `cmd_acc_reset_key: begin
                     busy <= 1;
                     do_acc_reset <= 1;
                     do_err_reset <= 1;
                  end
 
                  `cmd_err_reset_key: begin
                     busy <= 1;
                     do_err_reset <= 1;
                  end
 
                  `cmd_err_sense_reset_key: begin
                     busy <= 1;
                     do_err_sense_reset <= 1;
                  end
 
                  //--------------------------------------------------------------
                  // Read from general storage:
                  //    --> 4 digits address, little-endian
                  //    <-- 1 digit sign, 10 digits, little-endian
                  // 0 : Ignore if CPU not stopped
                  //     Accept low-order address digit
                  // 1 : Accept remaining address digits
                  // 2 : Calculate word origin in gs RAM
                  //     Validate address
                  //     console_read_gs <= 1;
                  // 3 : Send gs-early digit to out
                  //     digit_ready <= 1;
                  // 4 : digit_ready <= 0;
                  //--------------------------------------------------------------
                  `cmd_read_gs: begin
                     if (ctl_sw_manual) begin
                        busy <= 1;
                        state <= `state_read_gs_1;
                     end
                  end
 
                  // Write word to general storage:
                  //    --> 4 digits address, little-endian
                  //    <-- dx digit, sign digit, d1-d10
                  // 0: Ignore if not in manual
                  // 1: Readin low-order addr digit
                  // 2: Readin remaining addr digits
                  // 3: Synchronize with d10
                  //    digit_ready <- 1
                  // 4: Readin first digit
                  // 5: Write digit
                  //    Readin next digit
                  // 6: Cleanup
                  `cmd_write_gs: begin
                     if (ctl_sw_manual) begin
                        busy <= 1;
                        state <= `state_write_gs_1;
                     end
                  end
 
                  `cmd_read_acc: begin
                     busy <= 1;
                     state <= `state_read_acc_1;
                  end
 
                  `cmd_read_dist: begin
                     busy <= 1;
                     state <= `state_read_dist_1;
                  end
 
                  `cmd_read_prog: begin
                     busy <= 1;
                     state <= `state_read_prog_1;
                  end
 
                  `cmd_write_acc: begin
                     busy <= 1;
                     state <= `state_write_acc_1;
                  end
 
                  // 0 : Ignore if not in manual
                  //     Clear gs_ram_addr
                  // 1 : Synchronize with d10
                  //     Turn on console_write_gs
                  // 2 : Put a digit:
                  //     dx: blank
                  //     d0: minus
                  //     d1-d10: zero
                  //     gs_ram_addr++
                  `cmd_clear_gs: begin
                     if (ctl_sw_manual) begin
                        busy <= 1;
                        do_clear_drum <= 1;
                     end
                  end
 
                  `cmd_load_gs: begin
                     if (ctl_sw_manual) begin
                        busy <= 1;
                        state <= `state_load_gs_1;
                        digit_ready <= 1;
                     end
                  end
 
                  `cmd_dump_gs: begin
                     if (ctl_sw_manual) begin
                        busy <= 1;
                        state <= `state_dump_gs_1;
                     end
                  end
 
                  `cmd_power_on_reset: begin
                     busy <= 1;
                     do_power_on_reset <= 1;
                  end
 
                  `cmd_reset_console: begin
                     busy <= 1;
                     do_reset_console <= 1;
                  end
 
                  `cmd_hard_reset: begin
                     busy <= 1;
                     do_hard_reset <= 1;
                  end
 
               endcase;
            end
 
            // Reset console            
            `state_reset_console_1: begin
               if (d10) state <= `state_reset_console_2;
            end
 
            `state_reset_console_2: begin
               storage_entry_sw[ontime_idx] <= dx? `biq_blank
                                             : d0? `biq_plus : `biq_0;
               addr_sel_sw[ontime_idx[2:3]] <= `biq_0;
               if (d10) state <= `state_idle;
            end
 
            // Program reset key press
            `state_pgm_reset_1: begin
               if (wu & d10) begin
                  man_pgm_reset <= 1;
                  state <= `state_pgm_reset_2;
               end
            end
 
            `state_pgm_reset_2: begin
               if (wu & d10) begin
                  man_pgm_reset <= 0;
                  state <= `state_idle;
               end
            end
 
            // Accumulator reset key press
            `state_acc_reset_1: begin
               if (wu & d10) begin
                  man_acc_reset <= 1;
                  state <= `state_acc_reset_2;
               end
            end
 
            `state_acc_reset_2: begin
               if (wu & d10) begin
                  man_acc_reset <= 0;
                  state <= `state_idle;
               end
            end
 
            // Error reset key press
            `state_err_reset_1: begin
               if (wu & d10) begin
                  err_reset <= 1;
                  state <= `state_err_reset_2;
               end
            end
 
            `state_err_reset_2: begin
               if (wu & d10) begin
                  err_reset <= 0;
                  state <= `state_idle;
               end
            end
 
            // Error sense reset key press
            `state_err_sense_reset_1: begin
               if (wu & d10) begin
                  err_sense_reset <= 1;
                  state <= `state_err_sense_reset_2;
               end
            end
 
            `state_err_sense_reset_2: begin
               if (wu & d10) begin
                  err_sense_reset <= 0;
                  state <= `state_idle;
               end
            end
 
            // Hard reset
            `state_hard_reset_1: begin
               hard_reset <= 0;
               state <= `state_idle;
            end
 
            // Set storage entry switches
            `state_storage_entry_sw_1: begin
               if (d0) begin
                  state <= `state_storage_entry_sw_2;
                  digit_ready <= 1;
                  storage_entry_sw[ontime_idx] <= cmd_digit_in;
               end
            end
 
            `state_storage_entry_sw_2: begin
               storage_entry_sw[ontime_idx] <= cmd_digit_in;
               if (d10) begin
                  state <= `state_idle;
                  digit_ready <= 0;
               end
            end
 
            // Set address selection switches
            `state_addr_sel_sw_1: begin
               if (dx) begin
                  state <= `state_addr_sel_sw_2;
                  digit_ready <= 1;
                  addr_sel_sw[ontime_idx[2:3]] <= cmd_digit_in;
               end
            end
 
            `state_addr_sel_sw_2: begin
               addr_sel_sw[ontime_idx[2:3]] <= cmd_digit_in;
               if (d2) begin
                  state <= `state_idle;
                  digit_ready <= 0;
               end
            end
 
            // Transfer key press
            `state_xfer_key_1: begin
               if (d10) begin
                  console_to_addr <= 1;
                  state <= `state_xfer_key_2;
               end
            end
 
            `state_xfer_key_2: begin
               if (d10) begin
                  console_to_addr <= 0;
                  state <= `state_idle;
               end
            end
 
            // Start key press
            `state_pgm_start_key_1: begin
               if (wu & d10) begin
                  pgm_start <= 1;
                  state <= `state_pgm_start_key_2;
               end
            end
 
            `state_pgm_start_key_2: begin
               if (wu & d10) begin
                  pgm_start <= 0;
                  state <= `state_idle;
               end
            end
 
            // Stop key press
            `state_pgm_stop_key_1: begin
               if (hp) state <= `state_pgm_stop_key_2;
            end
 
            `state_pgm_stop_key_2: begin
               if (hp) begin
                  pgm_stop <= 0;
                  state <= `state_idle;
               end
            end
 
            // Read word from general storage
            //    --> 4 digits address, little-endian
            //    <-- 1 digit sign, 10 digits, little-endian
            // 0 : Ignore if CPU not stopped
            // 1 : Accept first address digit
            // 2 : Accept remaining address digits
            // 2 : Calculate word origin in gs RAM
            //     Validate address
            //     console_read_gs <= 1;
            // 3 : Send gs-early digit to out
            //     digit_ready <= 1;
            // 4 : digit_ready <= 0;
            `state_read_gs_1: begin
               if (dx) begin
                  state <= `state_read_gs_2;
                  digit_ready <= 1;
                  gs_addr_u <= cmd_digit_in;
               end
            end
 
            `state_read_gs_2: begin
               if (d0) gs_addr_t <= cmd_digit_in;
               else if (d1) gs_addr_h <= cmd_digit_in;
               else if (d2) begin
                  gs_addr_th <= cmd_digit_in;
                  state <= `state_read_gs_3;
                  digit_ready <= 0;
               end
            end
 
            `state_read_gs_3: begin
               if (d10) begin
                  gs_ram_addr <= gs_word_addr;
                  read_gs <= 1;
                  state <= `state_read_gs_4;
               end
            end
 
            `state_read_gs_4: begin
               state <= `state_read_gs_5;
               gs_ram_addr <= (gs_ram_addr + 1) % 32768;
            end
 
            `state_read_gs_5: begin
               digit_ready <= 1;
               cmd_digit_out <= gs_in;
               gs_ram_addr <= (gs_ram_addr + 1) % 32768;
               if (dx) begin
                  state <= `state_read_gs_6;
                  read_gs <= 0;
               end
            end
 
            `state_read_gs_6: begin
               digit_ready <= 0;
               state <= `state_idle;
            end
 
            // Write word to general storage:
            //    --> 4 digits address, little-endian
            //    <-- dx digit, sign digit, d1-d10
            // 0: Ignore if not in manual
            // 1: Readin low-order addr digit
            // 2: Readin remaining addr digits
            // 3: Synchronize with d10
            //    digit_ready <- 1
            // 4: Readin and write digit
            // 5: Write digit
            //    Readin next digit
            // 6: Cleanup
 
            `state_write_gs_1: begin
               if (dx) begin
                  state <= `state_write_gs_2;
                  digit_ready <= 1;
                  gs_addr_u <= cmd_digit_in;
               end
            end
 
            `state_write_gs_2: begin
               if (d0) gs_addr_t <= cmd_digit_in;
               else if (d1) gs_addr_h <= cmd_digit_in;
               else if (d2) begin
                  gs_addr_th <= cmd_digit_in;
                  state <= `state_write_gs_3;
                  digit_ready <= 0;
               end
            end
 
            `state_write_gs_3: begin
               if (d10) begin
                  gs_ram_addr <= gs_word_addr;
                  digit_ready <= 1;
                  state <= `state_write_gs_4;
               end
            end
 
            `state_write_gs_4: begin
               write_gs <= 1;
               console_out <= cmd_digit_in;
               if (write_gs)
                  gs_ram_addr <= (gs_ram_addr + 1) % 32768;
               if (d10) begin
                  digit_ready <= 0;
                  state <= `state_write_gs_5;
               end
            end
 
            `state_write_gs_5: begin
               write_gs <= 0;
               state <= `state_idle;
            end
 
            `state_read_acc_1: begin
               if (wl & d10) begin
                  state <= `state_read_acc_2;
               end
            end
 
            `state_read_acc_2: begin
               digit_ready <= 1;
               cmd_digit_out <= acc_ontime;
               if (wu & d10) begin
                  state <= `state_read_acc_3;
               end
            end
 
            `state_read_acc_3: begin
               digit_ready <= 0;
               state <= `state_idle;
            end
 
            `state_read_dist_1: begin
               if (d10) begin
                  state <= `state_read_dist_2;
               end
            end
 
            `state_read_dist_2: begin
               digit_ready <= 1;
               cmd_digit_out <= dist_ontime;
               if (d10) begin
                  state <= `state_read_dist_3;
               end
            end
 
            `state_read_dist_3: begin
               digit_ready <= 0;
               state <= `state_idle;
            end
 
            `state_read_prog_1: begin
               if (d10) begin
                  state <= `state_read_prog_2;
               end
            end
 
            `state_read_prog_2: begin
               digit_ready <= 1;
               cmd_digit_out <= prog_ontime;
               if (d10) begin
                  state <= `state_read_prog_3;
               end
            end
 
            `state_read_prog_3: begin
               digit_ready <= 0;
               state <= `state_idle;
            end
 
            `state_write_acc_1: begin
               if (wl & dx) begin
                  console_out <= cmd_digit_in;
                  acc_ri_console <= 1;
                  digit_ready <= 1;
                  state <= `state_write_acc_2;
               end
            end
 
            `state_write_acc_2: begin
               console_out <= cmd_digit_in;
               if (wu & d10) begin
                  digit_ready <= 0;
                  state <= `state_write_acc_3;
               end
            end
 
            `state_write_acc_3: begin
               acc_ri_console <= 0;
               state <= `state_idle;
            end
 
            // 0 : Ignore if not in manual
            // 1 : Synchronize with dx
            //     Put first dx digit
            // 2 : Put a digit:
            //     dx: blank
            //     d0: minus
            //     d1-d10: zero
            `state_clear_drum_1: begin
               if (dx) begin
                  console_out <= `biq_blank;
                  gs_ram_addr <= 15'd0;
                  write_gs <= 1;
                  state <= `state_clear_drum_2;
               end
            end
 
            `state_clear_drum_2: begin
               console_out <= dx? `biq_blank
                            : d0? `biq_minus
                            : `biq_0;
               gs_ram_addr <= (gs_ram_addr + 1) % 32768;
               if (gs_ram_addr == 15'd23999) begin
                  write_gs <= 0;
                  state <= `state_idle;
               end
            end
 
            `state_load_gs_1: begin
               gs_ram_addr <= 15'd0;
               write_gs <= 1;
               console_out <= cmd_digit_in;
               state <= `state_load_gs_2;
            end
 
            `state_load_gs_2: begin
               gs_ram_addr <= (gs_ram_addr + 1) % 32768;
               console_out <= cmd_digit_in;
               if (gs_ram_addr == 15'd23999) begin
                  write_gs <= 0;
                  digit_ready <= 0;
                  state <= `state_idle;
               end
            end
 
            `state_dump_gs_1: begin
               gs_ram_addr <= 15'd0;
               read_gs <= 1;
               state <= `state_dump_gs_2;
            end
 
            `state_dump_gs_2: begin
               gs_ram_addr <= (gs_ram_addr + 1) % 32768;
               state <= `state_dump_gs_3;
            end
 
            `state_dump_gs_3: begin
               digit_ready <= 1;
               gs_ram_addr <= (gs_ram_addr + 1) % 32768;
               cmd_digit_out <= gs_in;
               if (gs_ram_addr == 15'd23999) begin
                  state <= `state_dump_gs_4;
               end
            end
 
            `state_dump_gs_4: begin
               digit_ready <= 0;
               read_gs <= 0;
               state <= `state_idle;
            end
 
         endcase;
      end;
 
   always @(posedge ap)
      if (hard_reset) begin
         data_out <= `biq_blank;
         addr_out <= `biq_blank;
      end else begin
         data_out <= d10? `biq_blank : storage_entry_sw[early_idx];
         addr_out <= (d3 | d4 | d5 | d6)? addr_sel_sw[early_idx[2:3]] : `biq_blank;
      end;
 
   always @(posedge ap)
      if (hard_reset) begin
         punch_card       <= 0;
         read_card        <= 0;
         card_digit_ready <= 0;
      end;
 
endmodule

Line No.	Rev	Author	Line
1	7	eightycc	`timescale 1ns / 1ps
2			`//////////////////////////////////////////////////////////////////////////////////`
3			`// IBM 650 Reconstruction in Verilog (i650)`
4			`//`
5			`// This file is part of the IBM 650 Reconstruction in Verilog (i650) project`
6			`// http:////www.opencores.org/project,i650`
7			`//`
8			`// Description: Operator console and external control interface.`
9			`//`
10			`// Additional Comments: See US 2959351, Fig. 75, 76, 76 and 77. Also implements`
11			`// a simple command-based control interface.`
12			`//`
13			`// Copyright (c) 2015 Robert Abeles`
14			`//`
15			`// This source file is free software; you can redistribute it`
16			`// and/or modify it under the terms of the GNU Lesser General`
17			`// Public License as published by the Free Software Foundation;`
18			`// either version 2.1 of the License, or (at your option) any`
19			`// later version.`
20			`//`
21			`// This source is distributed in the hope that it will be`
22			`// useful, but WITHOUT ANY WARRANTY; without even the implied`
23			`// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR`
24			`// PURPOSE. See the GNU Lesser General Public License for more`
25			`// details.`
26			`//`
27			`// You should have received a copy of the GNU Lesser General`
28			`// Public License along with this source; if not, download it`
29			`// from http://www.opencores.org/lgpl.shtml`
30			`//////////////////////////////////////////////////////////////////////////////////`
31			`include "defines.v"
32
33			`module operator_ctl (`
34	11	eightycc	`input rst, clk,`
35	7	eightycc	`input ap, dp,`
36	16	eightycc	`input dx, d0, d1, d2, d3, d4, d5, d6, d9, d10,`
37			`input wu, wl, hp,`
38	7	eightycc	`input [0:3] early_idx, ontime_idx,`
39
40	15	eightycc	`input [0:6] cmd_digit_in, io_buffer_in, gs_in, acc_ontime, dist_ontime,`
41			`prog_ontime,`
42	7	eightycc	`input [0:5] command,`
43	22	eightycc	`input restart_reset,`
44	7	eightycc
45	11	eightycc	`output reg[0:6] data_out, addr_out, console_out,`
46	15	eightycc	`output [0:6] display_digit,`
47	21	eightycc	`output reg console_to_addr, acc_ri_console,`
48	7	eightycc	`output reg[0:14] gs_ram_addr,`
49	10	eightycc	`output reg read_gs, write_gs,`
50	7	eightycc	`output reg pgm_start, pgm_stop, err_reset, err_sense_reset,`
51			`output run_control, half_or_pgm_stop, ri_storage, ro_storage,`
52			`storage_control,`
53	16	eightycc	`output reg man_pgm_reset, man_acc_reset, hard_reset,`
54			`output set_8000, reset_8000,`
55	7	eightycc
56			`output reg[0:6] cmd_digit_out,`
57	22	eightycc	`output reg busy, digit_ready, restart_reset_busy,`
58	7	eightycc	`output reg punch_card, read_card, card_digit_ready`
59			`);`
60
61			`//-----------------------------------------------------------------------------`
62	12	eightycc	`// Operator console switch settings and their control signals.`
63	7	eightycc	`//-----------------------------------------------------------------------------`
64			`reg pgm_sw_stop, pgm_sw_run,`
65			`half_cycle_sw_run, half_cycle_sw_half,`
66			`ctl_sw_addr_stop, ctl_sw_run, ctl_sw_manual,`
67			`disp_sw_lacc, disp_sw_uacc, disp_sw_dist, disp_sw_pgm,`
68			`disp_sw_ri, disp_sw_ro,`
69			`ovflw_sw_stop, ovflw_sw_sense, err_sw_stop, err_sw_sense;`
70			`reg [0:6] storage_entry_sw [0:15];`
71			`reg [0:6] addr_sel_sw [0:3];`
72			`assign run_control = disp_sw_lacc \| disp_sw_uacc \| disp_sw_dist \| disp_sw_pgm;`
73			`assign half_or_pgm_stop = half_cycle_sw_half \| pgm_stop;`
74			`assign ri_storage = disp_sw_ri;`
75			`assign ro_storage = disp_sw_ro;`
76			`assign storage_control = run_control \| disp_sw_ro;`
77	15	eightycc	`assign display_digit = (disp_sw_lacc \| disp_sw_uacc)? acc_ontime`
78			`: (disp_sw_dist \| disp_sw_ri \| disp_sw_ro)? dist_ontime`
79			`: disp_sw_pgm? prog_ontime`
80			: `biq_blank;
81	16	eightycc	`assign set_8000 = man_pgm_reset & (ctl_sw_addr_stop \| ctl_sw_run);`
82			`assign reset_8000 = man_pgm_reset & ctl_sw_manual;`
83	7	eightycc
84	12	eightycc	`//-----------------------------------------------------------------------------`
85			`// Calculate the RAM address of the general storage word at address gs_addr_.`
86			`//-----------------------------------------------------------------------------`
87	7	eightycc	`reg [0:6] gs_addr_th, gs_addr_h, gs_addr_t, gs_addr_u;`
88	9	eightycc	`wire [0:14] gs_band_addr;`
89	10	eightycc	`wire [0:9] gs_word_offset;`
90	9	eightycc	`ram_band_addr rba(gs_addr_th, gs_addr_h, gs_addr_t, gs_band_addr);`
91	7	eightycc	`ram_word_offset rwo(gs_addr_t, gs_addr_u, gs_word_offset);`
92			`wire [0:14] gs_word_addr = gs_band_addr + gs_word_offset;`
93
94	12	eightycc	`//-----------------------------------------------------------------------------`
95			`// Operator console state machine`
96			`//-----------------------------------------------------------------------------`
97			`reg do_power_on_reset, do_reset_console, do_err_reset, do_err_sense_reset,`
98			`do_pgm_reset, do_acc_reset, do_hard_reset, do_clear_drum;`
99			`reg [0:5] state;`
100
101	7	eightycc	`define state_idle 6'd0
102
103			`define state_reset_console_1 6'd1
104			`define state_reset_console_2 6'd2
105			`define state_pgm_reset_1 6'd3
106			`define state_pgm_reset_2 6'd4
107			`define state_acc_reset_1 6'd5
108			`define state_acc_reset_2 6'd6
109			`define state_err_reset_1 6'd7
110			`define state_err_reset_2 6'd8
111			`define state_err_sense_reset_1 6'd9
112			`define state_err_sense_reset_2 6'd10
113	11	eightycc	`define state_hard_reset_1 6'd11
114	7	eightycc
115	11	eightycc	`define state_storage_entry_sw_1 6'd12
116			`define state_storage_entry_sw_2 6'd13
117			`define state_addr_sel_sw_1 6'd14
118			`define state_addr_sel_sw_2 6'd15
119	7	eightycc
120	11	eightycc	`define state_xfer_key_1 6'd16
121			`define state_xfer_key_2 6'd17
122			`define state_pgm_start_key_1 6'd18
123			`define state_pgm_start_key_2 6'd19
124			`define state_pgm_stop_key_1 6'd20
125			`define state_pgm_stop_key_2 6'd21
126	7	eightycc
127	11	eightycc	`define state_read_gs_1 6'd30
128			`define state_read_gs_2 6'd31
129			`define state_read_gs_3 6'd32
130			`define state_read_gs_4 6'd33
131			`define state_read_gs_5 6'd34
132	12	eightycc	`define state_read_gs_6 6'd35
133	13	eightycc	`define state_write_gs_1 6'd36
134			`define state_write_gs_2 6'd37
135			`define state_write_gs_3 6'd38
136			`define state_write_gs_4 6'd39
137			`define state_write_gs_5 6'd40
138	16	eightycc	`define state_read_acc_1 6'd41
139			`define state_read_acc_2 6'd42
140			`define state_read_acc_3 6'd43
141			`define state_read_dist_1 6'd44
142			`define state_read_dist_2 6'd45
143			`define state_read_dist_3 6'd46
144			`define state_read_prog_1 6'd47
145			`define state_read_prog_2 6'd48
146			`define state_read_prog_3 6'd49
147	21	eightycc	`define state_write_acc_1 6'd50
148			`define state_write_acc_2 6'd51
149			`define state_write_acc_3 6'd52
150			`define state_clear_drum_1 6'd53
151			`define state_clear_drum_2 6'd54
152			`define state_clear_drum_3 6'd55
153			`define state_load_gs_1 6'd56
154			`define state_load_gs_2 6'd57
155			`define state_dump_gs_1 6'd58
156			`define state_dump_gs_2 6'd59
157			`define state_dump_gs_3 6'd60
158			`define state_dump_gs_4 6'd61
159	7	eightycc
160	20	eightycc	`always @(posedge clk)`
161	7	eightycc	`if (rst) begin`
162			`console_to_addr <= 0;`
163			`pgm_start <= 0;`
164			`pgm_stop <= 0;`
165			`err_reset <= 0;`
166			`err_sense_reset <= 0;`
167			`man_pgm_reset <= 0;`
168			`man_acc_reset <= 0;`
169	11	eightycc	`hard_reset <= 0;`
170	7	eightycc
171			`// reset console switches`
172			`pgm_sw_stop <= 0;`
173			`pgm_sw_run <= 1;`
174	11	eightycc	`half_cycle_sw_run <= 1;`
175			`half_cycle_sw_half <= 0;`
176	7	eightycc	`ctl_sw_addr_stop <= 0;`
177			`ctl_sw_run <= 1;`
178			`ctl_sw_manual <= 0;`
179			`disp_sw_lacc <= 0;`
180			`disp_sw_uacc <= 0;`
181			`disp_sw_dist <= 1;`
182	22	eightycc	`disp_sw_pgm <= 0;`
183	7	eightycc	`disp_sw_ri <= 0;`
184			`disp_sw_ro <= 0;`
185			`ovflw_sw_stop <= 1;`
186			`ovflw_sw_sense <= 0;`
187			`err_sw_stop <= 1;`
188			`err_sw_sense <= 0;`
189
190			state <= `state_idle;
191			`busy <= 1;`
192			`digit_ready <= 0;`
193			cmd_digit_out <= `biq_blank;
194	22	eightycc	`restart_reset_busy <= 0;`
195	7	eightycc
196			`do_power_on_reset <= 1;`
197			`do_reset_console <= 0;`
198			`do_err_reset <= 0;`
199			`do_err_sense_reset <= 0;`
200			`do_pgm_reset <= 0;`
201			`do_acc_reset <= 0;`
202	11	eightycc	`do_hard_reset <= 0;`
203			`do_clear_drum <= 0;`
204	7	eightycc
205			`gs_ram_addr <= 15'd0;`
206	9	eightycc	`read_gs <= 0;`
207	10	eightycc	`write_gs <= 0;`
208	21	eightycc	`acc_ri_console <= 0;`
209	11	eightycc	console_out <= `biq_blank;
210			`end else if (dp) begin`
211	7	eightycc	`case (state)`
212			`state_idle: begin
213			`case (command)`
214			`cmd_none: begin
215	22	eightycc	`if (restart_reset) begin`
216			`do_pgm_reset <= 1;`
217			`do_acc_reset <= 1;`
218			`do_err_reset <= 1;`
219			`restart_reset_busy <= 1;`
220			`end else if (do_power_on_reset) begin`
221	7	eightycc	`do_power_on_reset <= 0;`
222			`do_reset_console <= 1;`
223			`do_pgm_reset <= 1;`
224			`do_acc_reset <= 1;`
225			`do_err_reset <= 1;`
226			`do_err_sense_reset <= 1;`
227	11	eightycc	`do_hard_reset <= 1;`
228			`do_clear_drum <= 1;`
229			`end else if (do_hard_reset) begin`
230	22	eightycc	`do_hard_reset <= 0;`
231			`hard_reset <= 1;`
232	11	eightycc	state <= `state_hard_reset_1;
233	7	eightycc	`end else if (do_reset_console) begin`
234			`do_reset_console <= 0;`
235			state <= `state_reset_console_1;
236			`end else if (do_pgm_reset) begin`
237			`do_pgm_reset <= 0;`
238			state <= `state_pgm_reset_1;
239			`end else if (do_acc_reset) begin`
240			`do_acc_reset <= 0;`
241			`man_acc_reset <= 1;`
242			state <= `state_acc_reset_1;
243			`end else if (do_err_reset) begin`
244			`do_err_reset <= 0;`
245			`err_reset <= 1;`
246			state <= `state_err_reset_1;
247			`end else if (do_err_sense_reset) begin`
248			`do_err_sense_reset <= 0;`
249	22	eightycc	`err_sense_reset <= 1;`
250	7	eightycc	state <= `state_err_sense_reset_1;
251	21	eightycc	`end else if (do_clear_drum) begin`
252	22	eightycc	`do_clear_drum <= 0;`
253	21	eightycc	state <= `state_clear_drum_1;
254	7	eightycc	`end else begin`
255			`busy <= 0;`
256			`digit_ready <= 0;`
257	22	eightycc	`restart_reset_busy <= 0;`
258	7	eightycc	`end`
259			`end`
260
261			`cmd_pgm_sw_stop: begin
262			`busy <= 1;`
263			`pgm_sw_stop <= 1;`
264			`pgm_sw_run <= 0;`
265			`end`
266
267			`cmd_pgm_sw_run: begin
268			`busy <= 1;`
269			`pgm_sw_stop <= 0;`
270			`pgm_sw_run <= 1;`
271			`end`
272
273			`cmd_half_cycle_sw_run: begin
274			`busy <= 1;`
275			`half_cycle_sw_run <= 1;`
276			`half_cycle_sw_half <= 0;`
277			`end`
278
279			`cmd_half_cycle_sw_half: begin
280			`busy <= 1;`
281			`half_cycle_sw_run <= 0;`
282			`half_cycle_sw_half <= 1;`
283			`end`
284
285			`cmd_ctl_sw_addr_stop: begin
286			`busy <= 1;`
287			`ctl_sw_addr_stop <= 1;`
288			`ctl_sw_run <= 0;`
289			`ctl_sw_manual <= 0;`
290			`end`
291
292			`cmd_ctl_sw_run: begin
293			`busy <= 1;`
294			`ctl_sw_addr_stop <= 0;`
295			`ctl_sw_run <= 1;`
296			`ctl_sw_manual <= 0;`
297			`end`
298
299			`cmd_ctl_sw_manual: begin
300			`busy <= 1;`
301			`ctl_sw_addr_stop <= 0;`
302			`ctl_sw_run <= 0;`
303			`ctl_sw_manual <= 1;`
304			`end`
305
306			`cmd_disp_sw_lacc: begin
307			`busy <= 1;`
308			`disp_sw_lacc <= 1;`
309			`disp_sw_uacc <= 0;`
310			`disp_sw_dist <= 0;`
311	22	eightycc	`disp_sw_pgm <= 0;`
312	7	eightycc	`disp_sw_ri <= 0;`
313			`disp_sw_ro <= 0;`
314			`end`
315
316			`cmd_disp_sw_uacc: begin
317			`busy <= 1;`
318			`disp_sw_lacc <= 0;`
319			`disp_sw_uacc <= 1;`
320			`disp_sw_dist <= 0;`
321			`disp_sw_pgm <= 0;`
322			`disp_sw_ri <= 0;`
323			`disp_sw_ro <= 0;`
324			`end`
325
326			`cmd_disp_sw_dist: begin
327			`busy <= 1;`
328			`disp_sw_lacc <= 0;`
329			`disp_sw_uacc <= 0;`
330			`disp_sw_dist <= 1;`
331			`disp_sw_pgm <= 0;`
332			`disp_sw_ri <= 0;`
333			`disp_sw_ro <= 0;`
334			`end`
335
336			`cmd_disp_sw_prog: begin
337			`busy <= 1;`
338			`disp_sw_lacc <= 0;`
339			`disp_sw_uacc <= 0;`
340			`disp_sw_dist <= 0;`
341			`disp_sw_pgm <= 1;`
342			`disp_sw_ri <= 0;`
343			`disp_sw_ro <= 0;`
344			`end`
345
346			`cmd_disp_sw_ri: begin
347			`busy <= 1;`
348			`disp_sw_lacc <= 0;`
349			`disp_sw_uacc <= 0;`
350			`disp_sw_dist <= 0;`
351			`disp_sw_pgm <= 0;`
352			`disp_sw_ri <= 1;`
353			`disp_sw_ro <= 0;`
354			`end`
355
356			`cmd_disp_sw_ro: begin
357			`busy <= 1;`
358			`disp_sw_lacc <= 0;`
359			`disp_sw_uacc <= 0;`
360			`disp_sw_dist <= 0;`
361			`disp_sw_pgm <= 0;`
362			`disp_sw_ri <= 0;`
363			`disp_sw_ro <= 1;`
364			`end`
365
366			`cmd_ovflw_sw_stop: begin
367			`busy <= 1;`
368			`ovflw_sw_stop <= 1;`
369			`ovflw_sw_sense <= 0;`
370			`end`
371
372			`cmd_ovflw_sw_sense: begin
373			`busy <= 1;`
374			`ovflw_sw_stop <= 0;`
375			`ovflw_sw_sense <= 1;`
376			`end`
377
378			`cmd_err_sw_stop: begin
379			`busy <= 1;`
380			`err_sw_stop <= 1;`
381			`err_sw_sense <= 0;`
382			`end`
383
384			`cmd_err_sw_sense: begin
385			`busy <= 1;`
386			`err_sw_stop <= 0;`
387			`err_sw_sense <= 1;`
388			`end`
389
390			`cmd_storage_entry_sw: begin
391			`busy <= 1;`
392			state <= `state_storage_entry_sw_1;
393			`end`
394
395			`cmd_addr_sel_sw: begin
396			`busy <= 1;`
397			state <= `state_addr_sel_sw_1;
398			`end`
399
400			`cmd_xfer_key: begin
401			`if (ctl_sw_manual) begin`
402			`busy <= 1;`
403			state <= `state_xfer_key_1;
404			`end`
405			`end`
406
407			`cmd_pgm_start_key: begin
408			`busy <= 1;`
409			state <= `state_pgm_start_key_1;
410			`end`
411
412			`cmd_pgm_stop_key: begin
413			`busy <= 1;`
414			`pgm_stop <= 1;`
415			state <= `state_pgm_stop_key_1;
416			`end`
417
418			`cmd_pgm_reset_key: begin
419	11	eightycc	`busy <= 1;`
420	7	eightycc	`do_pgm_reset <= 1;`
421			`do_err_reset <= 1;`
422			`end`
423
424			`cmd_comp_reset_key: begin
425	11	eightycc	`busy <= 1;`
426	7	eightycc	`do_pgm_reset <= 1;`
427			`do_acc_reset <= 1;`
428			`do_err_reset <= 1;`
429			`end`
430
431			`cmd_acc_reset_key: begin
432	11	eightycc	`busy <= 1;`
433	7	eightycc	`do_acc_reset <= 1;`
434			`do_err_reset <= 1;`
435			`end`
436
437			`cmd_err_reset_key: begin
438	11	eightycc	`busy <= 1;`
439	7	eightycc	`do_err_reset <= 1;`
440			`end`
441
442			`cmd_err_sense_reset_key: begin
443	11	eightycc	`busy <= 1;`
444	7	eightycc	`do_err_sense_reset <= 1;`
445			`end`
446
447			`//--------------------------------------------------------------`
448			`// Read from general storage:`
449			`// --> 4 digits address, little-endian`
450			`// <-- 1 digit sign, 10 digits, little-endian`
451			`// 0 : Ignore if CPU not stopped`
452			`// Accept low-order address digit`
453			`// 1 : Accept remaining address digits`
454			`// 2 : Calculate word origin in gs RAM`
455			`// Validate address`
456			`// console_read_gs <= 1;`
457			`// 3 : Send gs-early digit to out`
458			`// digit_ready <= 1;`
459			`// 4 : digit_ready <= 0;`
460			`//--------------------------------------------------------------`
461			`cmd_read_gs: begin
462			`if (ctl_sw_manual) begin`
463			`busy <= 1;`
464			state <= `state_read_gs_1;
465			`end`
466			`end`
467	10	eightycc
468	13	eightycc	`// Write word to general storage:`
469			`// --> 4 digits address, little-endian`
470			`// <-- dx digit, sign digit, d1-d10`
471			`// 0: Ignore if not in manual`
472			`// 1: Readin low-order addr digit`
473			`// 2: Readin remaining addr digits`
474			`// 3: Synchronize with d10`
475			`// digit_ready <- 1`
476			`// 4: Readin first digit`
477			`// 5: Write digit`
478			`// Readin next digit`
479			`// 6: Cleanup`
480	9	eightycc	`cmd_write_gs: begin
481	13	eightycc	`if (ctl_sw_manual) begin`
482			`busy <= 1;`
483			state <= `state_write_gs_1;
484			`end`
485	10	eightycc	`end`
486
487	9	eightycc	`cmd_read_acc: begin
488	16	eightycc	`busy <= 1;`
489			state <= `state_read_acc_1;
490	10	eightycc	`end`
491
492	9	eightycc	`cmd_read_dist: begin
493	16	eightycc	`busy <= 1;`
494			state <= `state_read_dist_1;
495	10	eightycc	`end`
496
497	9	eightycc	`cmd_read_prog: begin
498	16	eightycc	`busy <= 1;`
499			state <= `state_read_prog_1;
500	10	eightycc	`end`

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