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annotate blastcpm.c @ 1374:8f404b1fa572

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Go back to resetting the refresh counter after a DMA. Probably not quite correct as it is probably reset on VDP triggered refresh, but this is close enough for now given the general limitations with my refresh code. VDP FIFO Testing seems to be passing 100% reliably again (was occassionally failing still with the last commit)
author Michael Pavone <pavone@retrodev.com>
date Tue, 23 May 2017 23:47:40 -0700
parents 8f14767661fa
children 2455662378ed ca2336469397
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cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <stddef.h>
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4 #include <string.h>
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5 #include <sys/select.h>
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6
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7 #include "z80_to_x86.h"
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8 #include "util.h"
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10 uint8_t ram[64 * 1024];
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12 #define START_OFF 0x100
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13 #define OS_START 0xE400
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14 #define OS_RESET 0xE403
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15 int headless = 1;
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17 void z80_next_int_pulse(z80_context * context)
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18 {
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19 context->int_pulse_start = context->int_pulse_end = CYCLE_NEVER;
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20 }
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22 void render_errorbox(char *title, char *message)
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23 {
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24 }
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26 void render_infobox(char *title, char *message)
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27 {
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28 }
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30 void *console_write(uint32_t address, void *context, uint8_t value)
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31 {
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32 putchar(value);
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33 return context;
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34 }
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35
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36 uint8_t console_read(uint32_t address, void *context)
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37 {
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38 return getchar();
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39 }
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41 void *console_flush_write(uint32_t address, void *context, uint8_t value)
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42 {
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43 fflush(stdout);
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44 return context;
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45 }
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47 uint8_t console_status_read(uint32_t address, void *context)
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48 {
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49 fd_set read_fds;
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50 FD_ZERO(&read_fds);
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51 struct timeval timeout;
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52 timeout.tv_sec = 0;
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53 timeout.tv_usec = 0;
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54 FD_SET(fileno(stdin), &read_fds);
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55 return select(fileno(stdin)+1, &read_fds, NULL, NULL, &timeout) > 0;
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56 }
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57
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58 void *exit_write(uint32_t address, void *context, uint8_t value)
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59 {
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60 exit(0);
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61 return context;
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62 }
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63
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64 const memmap_chunk z80_map[] = {
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65 { 0x0000, 0x10000, 0xFFFF, 0, 0, MMAP_READ | MMAP_WRITE | MMAP_CODE, ram, NULL, NULL, NULL, NULL},
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66 };
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67
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68 const memmap_chunk io_map[] = {
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69 { 0x0, 0x1, 0xFFFF, 0, 0, 0, NULL, NULL, NULL, console_read, console_write},
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70 { 0x1, 0x2, 0xFFFF, 0, 0, 0, NULL, NULL, NULL, console_status_read, console_flush_write},
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71 { 0x2, 0x3, 0xFFFF, 0, 0, 0, NULL, NULL, NULL, NULL, exit_write},
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72 };
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73
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74 int main(int argc, char **argv)
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75 {
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76 FILE *f = fopen("fake_cpm.bin", "rb");
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77 long fsize = file_size(f);
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78 if (fsize > sizeof(ram) - OS_START) {
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79 fsize = sizeof(ram) - OS_START;
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80 }
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81 if (fread(ram + OS_START, 1, fsize, f) != fsize) {
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82 fprintf(stderr, "Error reading from fake_cpm.bin\n");
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83 exit(1);
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84 }
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85 f = fopen(argv[1], "rb");
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86 fsize = file_size(f);
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87 if (fsize > OS_START - START_OFF) {
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88 fsize = OS_START - START_OFF;
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89 }
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90 if (fread(ram + START_OFF, 1, fsize, f) != fsize) {
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91 fprintf(stderr, "Error reading from file %s\n", argv[1]);
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92 exit(1);
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93 }
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94 fclose(f);
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95 ram[0] = 0xC3;
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96 ram[1] = OS_RESET & 0xFF;
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97 ram[2] = OS_RESET >> 8;
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98 ram[5] = 0xC3;
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99 ram[6] = OS_START & 0xFF;
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100 ram[7] = OS_START >> 8;
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101
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102 z80_options opts;
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103 z80_context *context;
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104 init_z80_opts(&opts, z80_map, 1, io_map, 3, 1, 0xFF);
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105 context = init_z80_context(&opts);
820
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106 for(;;)
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107 {
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108 z80_run(context, 1000000);
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109 context->current_cycle = 0;
820
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110 }
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111 return 0;
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112 }