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annotate transz80.c @ 275:1a7d0a964ad2

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Implement shift instructions (untested)
author Mike Pavone <pavone@retrodev.com>
date Fri, 03 May 2013 18:49:48 -0700
parents 5f1b68cecfc7
children fd7c24b97ebf
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1 #include "z80inst.h"
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2 #include "z80_to_x86.h"
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3 #include "mem.h"
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4 #include "vdp.h"
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5 #include <stdio.h>
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6 #include <stdlib.h>
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7
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8 uint8_t z80_ram[0x2000];
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9 uint16_t cart[0x200000];
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10
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11 #define MCLKS_PER_Z80 15
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12 //TODO: Figure out the exact value for this
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13 #define MCLKS_PER_FRAME (MCLKS_LINE*262)
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14 #define VINT_CYCLE ((MCLKS_LINE * 226)/MCLKS_PER_Z80)
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15 #define CYCLE_NEVER 0xFFFFFFFF
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16
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17 int main(int argc, char ** argv)
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18 {
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19 long filesize;
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20 uint8_t *filebuf;
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21 x86_z80_options opts;
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22 z80_context context;
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23 if (argc < 2) {
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24 fputs("usage: transz80 zrom [cartrom]\n", stderr);
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25 exit(1);
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26 }
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27 FILE * f = fopen(argv[1], "rb");
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28 if (!f) {
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29 fprintf(stderr, "unable to open file %s\n", argv[2]);
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30 exit(1);
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31 }
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32 fseek(f, 0, SEEK_END);
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33 filesize = ftell(f);
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34 fseek(f, 0, SEEK_SET);
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35 fread(z80_ram, 1, filesize < sizeof(z80_ram) ? filesize : sizeof(z80_ram), f);
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36 fclose(f);
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37 if (argc > 2) {
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38 f = fopen(argv[2], "rb");
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39 if (!f) {
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40 fprintf(stderr, "unable to open file %s\n", argv[2]);
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41 exit(1);
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42 }
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43 fseek(f, 0, SEEK_END);
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44 filesize = ftell(f);
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45 fseek(f, 0, SEEK_SET);
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46 fread(cart, 1, filesize < sizeof(cart) ? filesize : sizeof(cart), f);
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47 fclose(f);
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48 for(unsigned short * cur = cart; cur - cart < (filesize/2); ++cur)
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49 {
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50 *cur = (*cur >> 8) | (*cur << 8);
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51 }
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52 }
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53 init_x86_z80_opts(&opts);
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54 init_z80_context(&context, &opts);
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55 //Z80 RAM
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56 context.mem_pointers[0] = z80_ram;
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57 context.sync_cycle = context.target_cycle = MCLKS_PER_FRAME/MCLKS_PER_Z80;
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58 context.int_cycle = CYCLE_NEVER;
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59 //cartridge/bank
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60 context.mem_pointers[1] = context.mem_pointers[2] = (uint8_t *)cart;
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61 z80_reset(&context);
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62 for(;;)
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63 {
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64 z80_run(&context);
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65 if (context.current_cycle >= MCLKS_PER_FRAME/MCLKS_PER_Z80) {
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66 context.current_cycle -= MCLKS_PER_FRAME/MCLKS_PER_Z80;
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67 }
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68 if (context.current_cycle < VINT_CYCLE && context.iff1) {
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69 context.int_cycle = VINT_CYCLE;
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70 }
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71 context.target_cycle = context.sync_cycle < context.int_cycle ? context.sync_cycle : context.int_cycle;
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72 }
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73 return 0;
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74 }