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Implement writes from Z80 to YM-2612
author Mike Pavone <pavone@retrodev.com>
date Mon, 06 May 2013 00:54:58 -0700
parents 1cc0850ab6bc
children e5e8b48ad157
comparison
equal deleted inserted replaced
289:1cc0850ab6bc 290:171f97e70d85
697 printf("Word read of unknown IO location: %X\n", location); 697 printf("Word read of unknown IO location: %X\n", location);
698 } 698 }
699 } 699 }
700 } 700 }
701 return context; 701 return context;
702 }
703
704 z80_context * z80_write_ym(uint16_t location, z80_context * context, uint8_t value)
705 {
706 genesis_context * gen = context->system;
707 ym_run(gen->ym, (context->current_cycle * MCLKS_PER_Z80) / MCLKS_PER_68K);
708 if (location & 1) {
709 ym_data_write(gen->ym, value);
710 } else if (location & 2) {
711 ym_address_write_part2(gen->ym, value);
712 } else {
713 ym_address_write_part1(gen->ym, value);
714 }
715 return context;
716 }
717
718 uint8_t z80_read_ym(uint16_t location, z80_context * context)
719 {
720 genesis_context * gen = context->system;
721 ym_run(gen->ym, (context->current_cycle * MCLKS_PER_Z80) / MCLKS_PER_68K);
722 return ym_read_status(gen->ym);
702 } 723 }
703 724
704 typedef struct bp_def { 725 typedef struct bp_def {
705 struct bp_def * next; 726 struct bp_def * next;
706 uint32_t address; 727 uint32_t address;
1013 1034
1014 z80_context z_context; 1035 z80_context z_context;
1015 x86_z80_options z_opts; 1036 x86_z80_options z_opts;
1016 init_x86_z80_opts(&z_opts); 1037 init_x86_z80_opts(&z_opts);
1017 init_z80_context(&z_context, &z_opts); 1038 init_z80_context(&z_context, &z_opts);
1018 z_context.next_context = &v_context; 1039
1040 genesis_context gen;
1041
1042 z_context.system = &gen;
1019 z_context.mem_pointers[0] = z80_ram; 1043 z_context.mem_pointers[0] = z80_ram;
1020 z_context.sync_cycle = z_context.target_cycle = MCLKS_PER_FRAME/MCLKS_PER_Z80; 1044 z_context.sync_cycle = z_context.target_cycle = MCLKS_PER_FRAME/MCLKS_PER_Z80;
1021 z_context.int_cycle = CYCLE_NEVER; 1045 z_context.int_cycle = CYCLE_NEVER;
1022 z_context.mem_pointers[1] = z_context.mem_pointers[2] = (uint8_t *)cart; 1046 z_context.mem_pointers[1] = z_context.mem_pointers[2] = (uint8_t *)cart;
1023 1047
1024 genesis_context gen;
1025 gen.z80 = &z_context; 1048 gen.z80 = &z_context;
1026 gen.vdp = &v_context; 1049 gen.vdp = &v_context;
1027 gen.ym = &y_context; 1050 gen.ym = &y_context;
1028 1051
1029 init_run_cpu(&gen, debug, address_log); 1052 init_run_cpu(&gen, debug, address_log);