56 lines
1.6 KiB
C++
56 lines
1.6 KiB
C++
#include "mbc_none.h"
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#include "mem.h"
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namespace mbc_none
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{
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uint8_t bootrom[256];
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uint8_t *rom;
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uint8_t vram[8192];
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uint8_t exram[8192];
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uint8_t wram[8192];
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uint8_t hram[512];
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uint8_t readMem(uint16_t address)
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{
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if (address < 0x8000) {
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if ( (address < 0x0100) && ((hram[0x150]&0x01)==0) ) return bootrom[address];
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return rom[address];
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} else if (address < 0xA000) {
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return vram[address - 0x8000];
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} else if (address < 0xC000) {
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return exram[address - 0xA000];
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} else if (address < 0xE000) {
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return wram[address - 0xC000];
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} else if (address < 0xFE00) {
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return wram[address - 0xE000];
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} else {
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return hram[address - 0XFE00];
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}
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}
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void writeMem(uint16_t address, uint8_t value)
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{
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if (address < 0x8000) {
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// Read Only Memory, you know...
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//rom[address] = value;
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} else if (address < 0xA000) {
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vram[address - 0x8000] = value;
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} else if (address < 0xC000) {
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exram[address - 0xA000] = value;
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} else if (address < 0xE000) {
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wram[address - 0xC000] = value;
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} else if (address < 0xFE00) {
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wram[address - 0xE000] = value;
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} else {
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if ( (address==0xFF50) && ((value&0x01) != 1) ) return; //Only allow disabling boot room
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hram[address - 0xFE00] = value;
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}
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}
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void init(uint8_t *rom)
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{
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mem::readMem = mbc_none::readMem;
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mem::writeMem = mbc_none::writeMem;
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mbc_none::rom = rom;
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}
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} |