Mercurial > repos > blastem
view transz80.c @ 995:2bc27415565b
Fix some stuff with interrupt timing. The change in adjust_int_cycle gets Overdrive working again (vint was not being preferred over hint in some cases). One of the changes seems to have broken Fatal Rewind again, but no other regressions that I can see.
author | Michael Pavone <pavone@retrodev.com> |
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date | Sat, 30 Apr 2016 08:37:55 -0700 |
parents | 759c38bf97f8 |
children |
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/* Copyright 2013 Michael Pavone This file is part of BlastEm. BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text. */ #include "z80inst.h" #include "z80_to_x86.h" #include "mem.h" #include "vdp.h" #include <stdio.h> #include <stdlib.h> uint8_t z80_ram[0x2000]; uint16_t cart[0x200000]; #define MCLKS_PER_Z80 15 //TODO: Figure out the exact value for this #define MCLKS_PER_FRAME (MCLKS_LINE*262) #define VINT_CYCLE ((MCLKS_LINE * 226)/MCLKS_PER_Z80) #define CYCLE_NEVER 0xFFFFFFFF uint8_t z80_read_ym(uint16_t location, z80_context * context) { return 0xFF; } z80_context * z80_write_ym(uint16_t location, z80_context * context, uint8_t value) { return context; } z80_context * z80_vdp_port_write(uint16_t location, z80_context * context, uint8_t value) { return context; } int main(int argc, char ** argv) { long filesize; uint8_t *filebuf; z80_options opts; z80_context context; if (argc < 2) { fputs("usage: transz80 zrom [cartrom]\n", stderr); exit(1); } FILE * f = fopen(argv[1], "rb"); if (!f) { fprintf(stderr, "unable to open file %s\n", argv[2]); exit(1); } fseek(f, 0, SEEK_END); filesize = ftell(f); fseek(f, 0, SEEK_SET); fread(z80_ram, 1, filesize < sizeof(z80_ram) ? filesize : sizeof(z80_ram), f); fclose(f); if (argc > 2) { f = fopen(argv[2], "rb"); if (!f) { fprintf(stderr, "unable to open file %s\n", argv[2]); exit(1); } fseek(f, 0, SEEK_END); filesize = ftell(f); fseek(f, 0, SEEK_SET); fread(cart, 1, filesize < sizeof(cart) ? filesize : sizeof(cart), f); fclose(f); for(unsigned short * cur = cart; cur - cart < (filesize/2); ++cur) { *cur = (*cur >> 8) | (*cur << 8); } } init_z80_opts(&opts); init_z80_context(&context, &opts); //Z80 RAM context.mem_pointers[0] = z80_ram; context.sync_cycle = context.target_cycle = MCLKS_PER_FRAME/MCLKS_PER_Z80; context.int_cycle = CYCLE_NEVER; //cartridge/bank context.mem_pointers[1] = context.mem_pointers[2] = (uint8_t *)cart; z80_reset(&context); for(;;) { z80_run(&context); if (context.current_cycle >= MCLKS_PER_FRAME/MCLKS_PER_Z80) { context.current_cycle -= MCLKS_PER_FRAME/MCLKS_PER_Z80; } if (context.current_cycle < VINT_CYCLE && context.iff1) { context.int_cycle = VINT_CYCLE; } context.target_cycle = context.sync_cycle < context.int_cycle ? context.sync_cycle : context.int_cycle; } return 0; }