mirror of
https://github.com/Spritetm/minimacplus.git
synced 2024-06-02 14:41:26 +00:00
86 lines
2.1 KiB
C
86 lines
2.1 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include "emu.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include "config.h"
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#include "m68k.h"
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#include "disp.h"
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unsigned char *macRom;
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unsigned char *macRam;
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int rom_remap;
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unsigned int m68k_read_memory_8(unsigned int address) {
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unsigned int ret;
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unsigned int pc=m68k_get_reg(NULL, M68K_REG_PC);
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if (rom_remap && address < TME_ROMSIZE) {
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ret=macRom[address];
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} else if (address < TME_RAMSIZE) {
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ret=macRam[address];
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} else if (address>0x400000 && address<0x41FFFF) {
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int romAdr=address-0x400000;
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if (romAdr>TME_ROMSIZE) printf("PC %x:Huh? Read from ROM mirror (%x)\n", pc, address);
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ret=macRom[romAdr&(TME_ROMSIZE-1)];
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} else {
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printf("PC %x: Read from %x\n", pc, address);
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ret=0xff;
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}
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// printf("Rd %x = %x\n", address, ret);
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return ret;
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}
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void m68k_write_memory_8(unsigned int address, unsigned int value) {
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unsigned int pc=m68k_get_reg(NULL, M68K_REG_PC);
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if (address < TME_RAMSIZE) {
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macRam[address]=value;
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} else {
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printf("PC %x: Write to %x: %x\n", pc, address, value);
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}
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}
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void tmeStartEmu(void *rom) {
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macRom=rom;
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macRam=malloc(TME_RAMSIZE);
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rom_remap=1;
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m68k_init();
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m68k_set_cpu_type(M68K_CPU_TYPE_68000);
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m68k_pulse_reset();
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dispInit();
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while(1) {
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m68k_execute(8000000/60);
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dispDraw(&macRam[0x1A700]);
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}
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}
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//Mac uses an 68008, which has an external 8-bit bus. Hence, it should be okay to do everything using 8-bit
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//reads/writes.
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unsigned int m68k_read_memory_32(unsigned int address) {
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unsigned int ret;
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ret=m68k_read_memory_16(address)<<16;
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ret|=m68k_read_memory_16(address+2);
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return ret;
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}
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unsigned int m68k_read_memory_16(unsigned int address) {
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unsigned int ret;
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ret=m68k_read_memory_8(address)<<8;
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ret|=m68k_read_memory_8(address+1);
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return ret;
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}
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void m68k_write_memory_32(unsigned int address, unsigned int value) {
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m68k_write_memory_16(address, value>>16);
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m68k_write_memory_16(address+2, value);
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}
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void m68k_write_memory_16(unsigned int address, unsigned int value) {
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m68k_write_memory_8(address, (value>>8)&0xff);
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m68k_write_memory_8(address+1, value&0xff);
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}
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