Mercurial > repos > blastem
annotate transz80.c @ 1016:5fb64487b6e1
Very basic support for S&K lock-on. Needs more work for full functionality.
author | Michael Pavone <pavone@retrodev.com> |
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date | Mon, 02 May 2016 21:06:12 -0700 |
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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 z80_context * z80_vdp_port_write(uint16_t location, z80_context * context, uint8_t value) |
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33 { |
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34 return context; |
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35 } |
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36 |
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37 int main(int argc, char ** argv) |
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38 { |
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39 long filesize; |
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40 uint8_t *filebuf; |
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41 z80_options opts; |
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42 z80_context context; |
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43 if (argc < 2) { |
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44 fputs("usage: transz80 zrom [cartrom]\n", stderr); |
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45 exit(1); |
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46 } |
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47 FILE * f = fopen(argv[1], "rb"); |
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48 if (!f) { |
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49 fprintf(stderr, "unable to open file %s\n", argv[2]); |
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50 exit(1); |
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51 } |
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52 fseek(f, 0, SEEK_END); |
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53 filesize = ftell(f); |
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54 fseek(f, 0, SEEK_SET); |
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55 fread(z80_ram, 1, filesize < sizeof(z80_ram) ? filesize : sizeof(z80_ram), f); |
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56 fclose(f); |
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57 if (argc > 2) { |
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58 f = fopen(argv[2], "rb"); |
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59 if (!f) { |
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60 fprintf(stderr, "unable to open file %s\n", argv[2]); |
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61 exit(1); |
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62 } |
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63 fseek(f, 0, SEEK_END); |
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64 filesize = ftell(f); |
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65 fseek(f, 0, SEEK_SET); |
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66 fread(cart, 1, filesize < sizeof(cart) ? filesize : sizeof(cart), f); |
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67 fclose(f); |
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68 for(unsigned short * cur = cart; cur - cart < (filesize/2); ++cur) |
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69 { |
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70 *cur = (*cur >> 8) | (*cur << 8); |
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71 } |
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72 } |
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73 init_z80_opts(&opts); |
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74 init_z80_context(&context, &opts); |
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75 //Z80 RAM |
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76 context.mem_pointers[0] = z80_ram; |
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77 context.sync_cycle = context.target_cycle = MCLKS_PER_FRAME/MCLKS_PER_Z80; |
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78 context.int_cycle = CYCLE_NEVER; |
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79 //cartridge/bank |
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80 context.mem_pointers[1] = context.mem_pointers[2] = (uint8_t *)cart; |
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81 z80_reset(&context); |
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82 for(;;) |
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83 { |
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84 z80_run(&context); |
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85 if (context.current_cycle >= MCLKS_PER_FRAME/MCLKS_PER_Z80) { |
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86 context.current_cycle -= MCLKS_PER_FRAME/MCLKS_PER_Z80; |
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87 } |
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88 if (context.current_cycle < VINT_CYCLE && context.iff1) { |
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89 context.int_cycle = VINT_CYCLE; |
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90 } |
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91 context.target_cycle = context.sync_cycle < context.int_cycle ? context.sync_cycle : context.int_cycle; |
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92 } |
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93 return 0; |
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94 } |