Mercurial > repos > blastem
view blastcpm.c @ 1925:039553703c20
Don't apply address and cd register changes to the 'live' registers until pending flag is cleared, but do preserve the upper address bits in the latch. Fixes regression in Overdrive 2 while preserving fix to Mona in 344 bytes
author | Michael Pavone <pavone@retrodev.com> |
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date | Mon, 13 Apr 2020 20:43:25 -0700 |
parents | 95e36a227c9d |
children | 8fe162bdb038 a66916828c9b |
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#include <stdio.h> #include <stdlib.h> #include <stddef.h> #include <string.h> #include <time.h> #include <sys/select.h> #ifdef NEW_CORE #include "z80.h" #else #include "z80_to_x86.h" #endif #include "util.h" uint8_t ram[64 * 1024]; #define START_OFF 0x100 #define OS_START 0xE400 #define OS_RESET 0xE403 int headless = 1; #ifndef NEW_CORE void z80_next_int_pulse(z80_context * context) { context->int_pulse_start = context->int_pulse_end = CYCLE_NEVER; } #endif void render_errorbox(char *title, char *message) { } void render_infobox(char *title, char *message) { } void *console_write(uint32_t address, void *context, uint8_t value) { putchar(value); return context; } uint8_t console_read(uint32_t address, void *context) { return getchar(); } void *console_flush_write(uint32_t address, void *context, uint8_t value) { fflush(stdout); return context; } uint8_t console_status_read(uint32_t address, void *context) { fd_set read_fds; FD_ZERO(&read_fds); struct timeval timeout; timeout.tv_sec = 0; timeout.tv_usec = 0; FD_SET(fileno(stdin), &read_fds); return select(fileno(stdin)+1, &read_fds, NULL, NULL, &timeout) > 0; } time_t start; uint64_t total_cycles; void *exit_write(uint32_t address, void *context, uint8_t value) { time_t duration = time(NULL) - start; z80_context *z80 = context; #ifdef NEW_CORE total_cycles += z80->cycles; #else total_cycles += context->current_cycle; #endif printf("Effective clock speed: %f MHz\n", ((double)total_cycles) / (1000000.0 * duration)); exit(0); return context; } const memmap_chunk z80_map[] = { { 0x0000, 0x10000, 0xFFFF, 0, 0, MMAP_READ | MMAP_WRITE | MMAP_CODE, ram, NULL, NULL, NULL, NULL}, }; memmap_chunk io_map[] = { { 0x0, 0x1, 0xFFFF, 0, 0, 0, NULL, NULL, NULL, console_read, console_write}, { 0x1, 0x2, 0xFFFF, 0, 0, 0, NULL, NULL, NULL, console_status_read, console_flush_write}, { 0x2, 0x3, 0xFFFF, 0, 0, 0, NULL, NULL, NULL, NULL, exit_write}, }; int main(int argc, char **argv) { FILE *f = fopen("fake_cpm.bin", "rb"); long fsize = file_size(f); if (fsize > sizeof(ram) - OS_START) { fsize = sizeof(ram) - OS_START; } if (fread(ram + OS_START, 1, fsize, f) != fsize) { fprintf(stderr, "Error reading from fake_cpm.bin\n"); exit(1); } f = fopen(argv[1], "rb"); fsize = file_size(f); if (fsize > OS_START - START_OFF) { fsize = OS_START - START_OFF; } if (fread(ram + START_OFF, 1, fsize, f) != fsize) { fprintf(stderr, "Error reading from file %s\n", argv[1]); exit(1); } fclose(f); ram[0] = 0xC3; ram[1] = OS_RESET & 0xFF; ram[2] = OS_RESET >> 8; ram[5] = 0xC3; ram[6] = OS_START & 0xFF; ram[7] = OS_START >> 8; z80_options opts; z80_context *context; init_z80_opts(&opts, z80_map, 1, io_map, 3, 1, 0xFF); context = init_z80_context(&opts); start = time(NULL); for(;;) { #ifdef NEW_CORE z80_execute(context, 1000000); total_cycles += context->cycles; context->cycles = 0; #else z80_run(context, 1000000); total_cycles += context->current_cycle; context->current_cycle = 0; #endif } return 0; }