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annotate transz80.c @ 478:2e4a4188cfb0

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Fix DMA fill so that it does not cause observable changes to the FIFO. Get DMA copy mostly correct from an observable ffect perspective. DMA copy probably does not reflect internal implementation still given that evidence seems to suggest no FIFO usage at all.
author Mike Pavone <pavone@retrodev.com>
date Tue, 17 Sep 2013 00:11:45 -0700
parents 140af5509ce7
children b7b7a1cab44a
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1 /*
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2 Copyright 2013 Michael Pavone
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3 This file is part of BlastEm.
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4 BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text.
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5 */
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6 #include "z80inst.h"
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7 #include "z80_to_x86.h"
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8 #include "mem.h"
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9 #include "vdp.h"
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10 #include <stdio.h>
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11 #include <stdlib.h>
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12
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13 uint8_t z80_ram[0x2000];
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14 uint16_t cart[0x200000];
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15
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16 #define MCLKS_PER_Z80 15
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17 //TODO: Figure out the exact value for this
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18 #define MCLKS_PER_FRAME (MCLKS_LINE*262)
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19 #define VINT_CYCLE ((MCLKS_LINE * 226)/MCLKS_PER_Z80)
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20 #define CYCLE_NEVER 0xFFFFFFFF
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21
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22 uint8_t z80_read_ym(uint16_t location, z80_context * context)
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23 {
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24 return 0xFF;
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25 }
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26
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27 z80_context * z80_write_ym(uint16_t location, z80_context * context, uint8_t value)
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28 {
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29 return context;
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30 }
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31
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32 int main(int argc, char ** argv)
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33 {
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34 long filesize;
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35 uint8_t *filebuf;
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36 x86_z80_options opts;
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37 z80_context context;
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38 if (argc < 2) {
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39 fputs("usage: transz80 zrom [cartrom]\n", stderr);
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40 exit(1);
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41 }
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42 FILE * f = fopen(argv[1], "rb");
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43 if (!f) {
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44 fprintf(stderr, "unable to open file %s\n", argv[2]);
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45 exit(1);
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46 }
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47 fseek(f, 0, SEEK_END);
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48 filesize = ftell(f);
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49 fseek(f, 0, SEEK_SET);
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50 fread(z80_ram, 1, filesize < sizeof(z80_ram) ? filesize : sizeof(z80_ram), f);
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51 fclose(f);
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52 if (argc > 2) {
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53 f = fopen(argv[2], "rb");
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54 if (!f) {
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55 fprintf(stderr, "unable to open file %s\n", argv[2]);
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56 exit(1);
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57 }
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58 fseek(f, 0, SEEK_END);
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59 filesize = ftell(f);
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60 fseek(f, 0, SEEK_SET);
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61 fread(cart, 1, filesize < sizeof(cart) ? filesize : sizeof(cart), f);
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62 fclose(f);
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63 for(unsigned short * cur = cart; cur - cart < (filesize/2); ++cur)
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64 {
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65 *cur = (*cur >> 8) | (*cur << 8);
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66 }
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67 }
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68 init_x86_z80_opts(&opts);
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69 init_z80_context(&context, &opts);
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70 //Z80 RAM
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71 context.mem_pointers[0] = z80_ram;
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72 context.sync_cycle = context.target_cycle = MCLKS_PER_FRAME/MCLKS_PER_Z80;
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73 context.int_cycle = CYCLE_NEVER;
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74 //cartridge/bank
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75 context.mem_pointers[1] = context.mem_pointers[2] = (uint8_t *)cart;
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76 z80_reset(&context);
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77 for(;;)
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78 {
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79 z80_run(&context);
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80 if (context.current_cycle >= MCLKS_PER_FRAME/MCLKS_PER_Z80) {
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81 context.current_cycle -= MCLKS_PER_FRAME/MCLKS_PER_Z80;
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82 }
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83 if (context.current_cycle < VINT_CYCLE && context.iff1) {
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84 context.int_cycle = VINT_CYCLE;
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85 }
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86 context.target_cycle = context.sync_cycle < context.int_cycle ? context.sync_cycle : context.int_cycle;
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87 }
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88 return 0;
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89 }