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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,
 
      output reg[0:6] data_out, addr_out, console_out,
      output [0:6] display_digit,
      output reg console_to_addr,
      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,
      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_clear_drum_1          6'd50
   `define state_clear_drum_2          6'd51
   `define state_clear_drum_3          6'd52
   `define state_load_gs_1             6'd53
   `define state_load_gs_2             6'd54
   `define state_dump_gs_1             6'd55
   `define state_dump_gs_2             6'd56
   `define state_dump_gs_3             6'd57
   `define state_dump_gs_4             6'd58
 
   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;
 
         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;
         console_out        <= `biq_blank;
      end else if (dp) begin
         case (state)
            `state_idle: begin
               case (command)
                  `cmd_none: begin
                     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_clear_drum) begin
                        do_clear_drum <= 0;
                        state <= `state_clear_drum_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 begin
                        busy <= 0;
                        digit_ready <= 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
 
                  // 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
 
            // 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
44	11	eightycc	`output reg[0:6] data_out, addr_out, console_out,`
45	15	eightycc	`output [0:6] display_digit,`
46	7	eightycc	`output reg console_to_addr,`
47			`output reg[0:14] gs_ram_addr,`
48	10	eightycc	`output reg read_gs, write_gs,`
49	7	eightycc	`output reg pgm_start, pgm_stop, err_reset, err_sense_reset,`
50			`output run_control, half_or_pgm_stop, ri_storage, ro_storage,`
51			`storage_control,`
52	16	eightycc	`output reg man_pgm_reset, man_acc_reset, hard_reset,`
53			`output set_8000, reset_8000,`
54	7	eightycc
55			`output reg[0:6] cmd_digit_out,`
56			`output reg busy, digit_ready,`
57			`output reg punch_card, read_card, card_digit_ready`
58			`);`
59
60			`//-----------------------------------------------------------------------------`
61	12	eightycc	`// Operator console switch settings and their control signals.`
62	7	eightycc	`//-----------------------------------------------------------------------------`
63			`reg pgm_sw_stop, pgm_sw_run,`
64			`half_cycle_sw_run, half_cycle_sw_half,`
65			`ctl_sw_addr_stop, ctl_sw_run, ctl_sw_manual,`
66			`disp_sw_lacc, disp_sw_uacc, disp_sw_dist, disp_sw_pgm,`
67			`disp_sw_ri, disp_sw_ro,`
68			`ovflw_sw_stop, ovflw_sw_sense, err_sw_stop, err_sw_sense;`
69			`reg [0:6] storage_entry_sw [0:15];`
70			`reg [0:6] addr_sel_sw [0:3];`
71			`assign run_control = disp_sw_lacc \| disp_sw_uacc \| disp_sw_dist \| disp_sw_pgm;`
72			`assign half_or_pgm_stop = half_cycle_sw_half \| pgm_stop;`
73			`assign ri_storage = disp_sw_ri;`
74			`assign ro_storage = disp_sw_ro;`
75			`assign storage_control = run_control \| disp_sw_ro;`
76	15	eightycc	`assign display_digit = (disp_sw_lacc \| disp_sw_uacc)? acc_ontime`
77			`: (disp_sw_dist \| disp_sw_ri \| disp_sw_ro)? dist_ontime`
78			`: disp_sw_pgm? prog_ontime`
79			: `biq_blank;
80	16	eightycc	`assign set_8000 = man_pgm_reset & (ctl_sw_addr_stop \| ctl_sw_run);`
81			`assign reset_8000 = man_pgm_reset & ctl_sw_manual;`
82	7	eightycc
83	12	eightycc	`//-----------------------------------------------------------------------------`
84			`// Calculate the RAM address of the general storage word at address gs_addr_.`
85			`//-----------------------------------------------------------------------------`
86	7	eightycc	`reg [0:6] gs_addr_th, gs_addr_h, gs_addr_t, gs_addr_u;`
87	9	eightycc	`wire [0:14] gs_band_addr;`
88	10	eightycc	`wire [0:9] gs_word_offset;`
89	9	eightycc	`ram_band_addr rba(gs_addr_th, gs_addr_h, gs_addr_t, gs_band_addr);`
90	7	eightycc	`ram_word_offset rwo(gs_addr_t, gs_addr_u, gs_word_offset);`
91			`wire [0:14] gs_word_addr = gs_band_addr + gs_word_offset;`
92
93	12	eightycc	`//-----------------------------------------------------------------------------`
94			`// Operator console state machine`
95			`//-----------------------------------------------------------------------------`
96			`reg do_power_on_reset, do_reset_console, do_err_reset, do_err_sense_reset,`
97			`do_pgm_reset, do_acc_reset, do_hard_reset, do_clear_drum;`
98			`reg [0:5] state;`
99
100	7	eightycc	`define state_idle 6'd0
101
102			`define state_reset_console_1 6'd1
103			`define state_reset_console_2 6'd2
104			`define state_pgm_reset_1 6'd3
105			`define state_pgm_reset_2 6'd4
106			`define state_acc_reset_1 6'd5
107			`define state_acc_reset_2 6'd6
108			`define state_err_reset_1 6'd7
109			`define state_err_reset_2 6'd8
110			`define state_err_sense_reset_1 6'd9
111			`define state_err_sense_reset_2 6'd10
112	11	eightycc	`define state_hard_reset_1 6'd11
113	7	eightycc
114	11	eightycc	`define state_storage_entry_sw_1 6'd12
115			`define state_storage_entry_sw_2 6'd13
116			`define state_addr_sel_sw_1 6'd14
117			`define state_addr_sel_sw_2 6'd15
118	7	eightycc
119	11	eightycc	`define state_xfer_key_1 6'd16
120			`define state_xfer_key_2 6'd17
121			`define state_pgm_start_key_1 6'd18
122			`define state_pgm_start_key_2 6'd19
123			`define state_pgm_stop_key_1 6'd20
124			`define state_pgm_stop_key_2 6'd21
125	7	eightycc
126	11	eightycc	`define state_read_gs_1 6'd30
127			`define state_read_gs_2 6'd31
128			`define state_read_gs_3 6'd32
129			`define state_read_gs_4 6'd33
130			`define state_read_gs_5 6'd34
131	12	eightycc	`define state_read_gs_6 6'd35
132	13	eightycc	`define state_write_gs_1 6'd36
133			`define state_write_gs_2 6'd37
134			`define state_write_gs_3 6'd38
135			`define state_write_gs_4 6'd39
136			`define state_write_gs_5 6'd40
137	16	eightycc	`define state_read_acc_1 6'd41
138			`define state_read_acc_2 6'd42
139			`define state_read_acc_3 6'd43
140			`define state_read_dist_1 6'd44
141			`define state_read_dist_2 6'd45
142			`define state_read_dist_3 6'd46
143			`define state_read_prog_1 6'd47
144			`define state_read_prog_2 6'd48
145			`define state_read_prog_3 6'd49
146			`define state_clear_drum_1 6'd50
147			`define state_clear_drum_2 6'd51
148			`define state_clear_drum_3 6'd52
149			`define state_load_gs_1 6'd53
150			`define state_load_gs_2 6'd54
151			`define state_dump_gs_1 6'd55
152			`define state_dump_gs_2 6'd56
153			`define state_dump_gs_3 6'd57
154			`define state_dump_gs_4 6'd58
155	7	eightycc
156	20	eightycc	`always @(posedge clk)`
157	7	eightycc	`if (rst) begin`
158			`console_to_addr <= 0;`
159			`pgm_start <= 0;`
160			`pgm_stop <= 0;`
161			`err_reset <= 0;`
162			`err_sense_reset <= 0;`
163			`man_pgm_reset <= 0;`
164			`man_acc_reset <= 0;`
165	11	eightycc	`hard_reset <= 0;`
166	7	eightycc
167			`// reset console switches`
168			`pgm_sw_stop <= 0;`
169			`pgm_sw_run <= 1;`
170	11	eightycc	`half_cycle_sw_run <= 1;`
171			`half_cycle_sw_half <= 0;`
172	7	eightycc	`ctl_sw_addr_stop <= 0;`
173			`ctl_sw_run <= 1;`
174			`ctl_sw_manual <= 0;`
175			`disp_sw_lacc <= 0;`
176			`disp_sw_uacc <= 0;`
177			`disp_sw_dist <= 1;`
178			`disp_sw_pgm <= 0;`
179			`disp_sw_ri <= 0;`
180			`disp_sw_ro <= 0;`
181			`ovflw_sw_stop <= 1;`
182			`ovflw_sw_sense <= 0;`
183			`err_sw_stop <= 1;`
184			`err_sw_sense <= 0;`
185
186			state <= `state_idle;
187			`busy <= 1;`
188			`digit_ready <= 0;`
189			cmd_digit_out <= `biq_blank;
190
191			`do_power_on_reset <= 1;`
192			`do_reset_console <= 0;`
193			`do_err_reset <= 0;`
194			`do_err_sense_reset <= 0;`
195			`do_pgm_reset <= 0;`
196			`do_acc_reset <= 0;`
197	11	eightycc	`do_hard_reset <= 0;`
198			`do_clear_drum <= 0;`
199	7	eightycc
200			`gs_ram_addr <= 15'd0;`
201	9	eightycc	`read_gs <= 0;`
202	10	eightycc	`write_gs <= 0;`
203	11	eightycc	console_out <= `biq_blank;
204			`end else if (dp) begin`
205	7	eightycc	`case (state)`
206			`state_idle: begin
207			`case (command)`
208			`cmd_none: begin
209			`if (do_power_on_reset) begin`
210			`do_power_on_reset <= 0;`
211			`do_reset_console <= 1;`
212			`do_pgm_reset <= 1;`
213			`do_acc_reset <= 1;`
214			`do_err_reset <= 1;`
215			`do_err_sense_reset <= 1;`
216	11	eightycc	`do_hard_reset <= 1;`
217			`do_clear_drum <= 1;`
218			`end else if (do_hard_reset) begin`
219			`do_hard_reset <= 0;`
220			`hard_reset <= 1;`
221			state <= `state_hard_reset_1;
222	7	eightycc	`end else if (do_reset_console) begin`
223			`do_reset_console <= 0;`
224			state <= `state_reset_console_1;
225	11	eightycc	`end else if (do_clear_drum) begin`
226			`do_clear_drum <= 0;`
227			state <= `state_clear_drum_1;
228	7	eightycc	`end else if (do_pgm_reset) begin`
229			`do_pgm_reset <= 0;`
230			state <= `state_pgm_reset_1;
231			`end else if (do_acc_reset) begin`
232			`do_acc_reset <= 0;`
233			`man_acc_reset <= 1;`
234			state <= `state_acc_reset_1;
235			`end else if (do_err_reset) begin`
236			`do_err_reset <= 0;`
237			`err_reset <= 1;`
238			state <= `state_err_reset_1;
239			`end else if (do_err_sense_reset) begin`
240			`do_err_sense_reset <= 0;`
241			`err_sense_reset <= 1;`
242			state <= `state_err_sense_reset_1;
243			`end else begin`
244			`busy <= 0;`
245			`digit_ready <= 0;`
246			`end`
247			`end`
248
249			`cmd_pgm_sw_stop: begin
250			`busy <= 1;`
251			`pgm_sw_stop <= 1;`
252			`pgm_sw_run <= 0;`
253			`end`
254
255			`cmd_pgm_sw_run: begin
256			`busy <= 1;`
257			`pgm_sw_stop <= 0;`
258			`pgm_sw_run <= 1;`
259			`end`
260
261			`cmd_half_cycle_sw_run: begin
262			`busy <= 1;`
263			`half_cycle_sw_run <= 1;`
264			`half_cycle_sw_half <= 0;`
265			`end`
266
267			`cmd_half_cycle_sw_half: begin
268			`busy <= 1;`
269			`half_cycle_sw_run <= 0;`
270			`half_cycle_sw_half <= 1;`
271			`end`
272
273			`cmd_ctl_sw_addr_stop: begin
274			`busy <= 1;`
275			`ctl_sw_addr_stop <= 1;`
276			`ctl_sw_run <= 0;`
277			`ctl_sw_manual <= 0;`
278			`end`
279
280			`cmd_ctl_sw_run: begin
281			`busy <= 1;`
282			`ctl_sw_addr_stop <= 0;`
283			`ctl_sw_run <= 1;`
284			`ctl_sw_manual <= 0;`
285			`end`
286
287			`cmd_ctl_sw_manual: begin
288			`busy <= 1;`
289			`ctl_sw_addr_stop <= 0;`
290			`ctl_sw_run <= 0;`
291			`ctl_sw_manual <= 1;`
292			`end`
293
294			`cmd_disp_sw_lacc: begin
295			`busy <= 1;`
296			`disp_sw_lacc <= 1;`
297			`disp_sw_uacc <= 0;`
298			`disp_sw_dist <= 0;`
299			`disp_sw_pgm <= 0;`
300			`disp_sw_ri <= 0;`
301			`disp_sw_ro <= 0;`
302			`end`
303
304			`cmd_disp_sw_uacc: begin
305			`busy <= 1;`
306			`disp_sw_lacc <= 0;`
307			`disp_sw_uacc <= 1;`
308			`disp_sw_dist <= 0;`
309			`disp_sw_pgm <= 0;`
310			`disp_sw_ri <= 0;`
311			`disp_sw_ro <= 0;`
312			`end`
313
314			`cmd_disp_sw_dist: begin
315			`busy <= 1;`
316			`disp_sw_lacc <= 0;`
317			`disp_sw_uacc <= 0;`
318			`disp_sw_dist <= 1;`
319			`disp_sw_pgm <= 0;`
320			`disp_sw_ri <= 0;`
321			`disp_sw_ro <= 0;`
322			`end`
323
324			`cmd_disp_sw_prog: begin
325			`busy <= 1;`
326			`disp_sw_lacc <= 0;`
327			`disp_sw_uacc <= 0;`
328			`disp_sw_dist <= 0;`
329			`disp_sw_pgm <= 1;`
330			`disp_sw_ri <= 0;`
331			`disp_sw_ro <= 0;`
332			`end`
333
334			`cmd_disp_sw_ri: begin
335			`busy <= 1;`
336			`disp_sw_lacc <= 0;`
337			`disp_sw_uacc <= 0;`
338			`disp_sw_dist <= 0;`
339			`disp_sw_pgm <= 0;`
340			`disp_sw_ri <= 1;`
341			`disp_sw_ro <= 0;`
342			`end`
343
344			`cmd_disp_sw_ro: begin
345			`busy <= 1;`
346			`disp_sw_lacc <= 0;`
347			`disp_sw_uacc <= 0;`
348			`disp_sw_dist <= 0;`
349			`disp_sw_pgm <= 0;`
350			`disp_sw_ri <= 0;`
351			`disp_sw_ro <= 1;`
352			`end`
353
354			`cmd_ovflw_sw_stop: begin
355			`busy <= 1;`
356			`ovflw_sw_stop <= 1;`
357			`ovflw_sw_sense <= 0;`
358			`end`
359
360			`cmd_ovflw_sw_sense: begin
361			`busy <= 1;`
362			`ovflw_sw_stop <= 0;`
363			`ovflw_sw_sense <= 1;`
364			`end`
365
366			`cmd_err_sw_stop: begin
367			`busy <= 1;`
368			`err_sw_stop <= 1;`
369			`err_sw_sense <= 0;`
370			`end`
371
372			`cmd_err_sw_sense: begin
373			`busy <= 1;`
374			`err_sw_stop <= 0;`
375			`err_sw_sense <= 1;`
376			`end`
377
378			`cmd_storage_entry_sw: begin
379			`busy <= 1;`
380			state <= `state_storage_entry_sw_1;
381			`end`
382
383			`cmd_addr_sel_sw: begin
384			`busy <= 1;`
385			state <= `state_addr_sel_sw_1;
386			`end`
387
388			`cmd_xfer_key: begin
389			`if (ctl_sw_manual) begin`
390			`busy <= 1;`
391			state <= `state_xfer_key_1;
392			`end`
393			`end`
394
395			`cmd_pgm_start_key: begin
396			`busy <= 1;`
397			state <= `state_pgm_start_key_1;
398			`end`
399
400			`cmd_pgm_stop_key: begin
401			`busy <= 1;`
402			`pgm_stop <= 1;`
403			state <= `state_pgm_stop_key_1;
404			`end`
405
406			`cmd_pgm_reset_key: begin
407	11	eightycc	`busy <= 1;`
408	7	eightycc	`do_pgm_reset <= 1;`
409			`do_err_reset <= 1;`
410			`end`
411
412			`cmd_comp_reset_key: begin
413	11	eightycc	`busy <= 1;`
414	7	eightycc	`do_pgm_reset <= 1;`
415			`do_acc_reset <= 1;`
416			`do_err_reset <= 1;`
417			`end`
418
419			`cmd_acc_reset_key: begin
420	11	eightycc	`busy <= 1;`
421	7	eightycc	`do_acc_reset <= 1;`
422			`do_err_reset <= 1;`
423			`end`
424
425			`cmd_err_reset_key: begin
426	11	eightycc	`busy <= 1;`
427	7	eightycc	`do_err_reset <= 1;`
428			`end`
429
430			`cmd_err_sense_reset_key: begin
431	11	eightycc	`busy <= 1;`
432	7	eightycc	`do_err_sense_reset <= 1;`
433			`end`
434
435			`//--------------------------------------------------------------`
436			`// Read from general storage:`
437			`// --> 4 digits address, little-endian`
438			`// <-- 1 digit sign, 10 digits, little-endian`
439			`// 0 : Ignore if CPU not stopped`
440			`// Accept low-order address digit`
441			`// 1 : Accept remaining address digits`
442			`// 2 : Calculate word origin in gs RAM`
443			`// Validate address`
444			`// console_read_gs <= 1;`
445			`// 3 : Send gs-early digit to out`
446			`// digit_ready <= 1;`
447			`// 4 : digit_ready <= 0;`
448			`//--------------------------------------------------------------`
449			`cmd_read_gs: begin
450			`if (ctl_sw_manual) begin`
451			`busy <= 1;`
452			state <= `state_read_gs_1;
453			`end`
454			`end`
455	10	eightycc
456	13	eightycc	`// Write word to general storage:`
457			`// --> 4 digits address, little-endian`
458			`// <-- dx digit, sign digit, d1-d10`
459			`// 0: Ignore if not in manual`
460			`// 1: Readin low-order addr digit`
461			`// 2: Readin remaining addr digits`
462			`// 3: Synchronize with d10`
463			`// digit_ready <- 1`
464			`// 4: Readin first digit`
465			`// 5: Write digit`
466			`// Readin next digit`
467			`// 6: Cleanup`
468	9	eightycc	`cmd_write_gs: begin
469	13	eightycc	`if (ctl_sw_manual) begin`
470			`busy <= 1;`
471			state <= `state_write_gs_1;
472			`end`
473	10	eightycc	`end`
474
475	9	eightycc	`cmd_read_acc: begin
476	16	eightycc	`busy <= 1;`
477			state <= `state_read_acc_1;
478	10	eightycc	`end`
479
480	9	eightycc	`cmd_read_dist: begin
481	16	eightycc	`busy <= 1;`
482			state <= `state_read_dist_1;
483	10	eightycc	`end`
484
485	9	eightycc	`cmd_read_prog: begin
486	16	eightycc	`busy <= 1;`
487			state <= `state_read_prog_1;
488	10	eightycc	`end`
489
490			`// 0 : Ignore if not in manual`
491			`// Clear gs_ram_addr`
492			`// 1 : Synchronize with d10`
493			`// Turn on console_write_gs`
494			`// 2 : Put a digit:`
495			`// dx: blank`
496			`// d0: minus`
497			`// d1-d10: zero`
498			`// gs_ram_addr++`
499	9	eightycc	`cmd_clear_gs: begin
500	11	eightycc	`if (ctl_sw_manual) begin`

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