mirror of
https://github.com/SourMesen/Mesen.git
synced 2024-06-01 19:08:17 -04:00
53 lines
1.4 KiB
C++
53 lines
1.4 KiB
C++
#pragma once
|
|
#include "stdafx.h"
|
|
#include "MMC3_215.h"
|
|
|
|
class Unl8237A : public MMC3_215
|
|
{
|
|
void SelectCHRPage(uint16_t slot, uint16_t page, ChrMemoryType memoryType) override
|
|
{
|
|
if(_exRegs[0] & 0x40) {
|
|
MMC3::SelectCHRPage(slot, ((_exRegs[1] & 0x0E) << 7) | (page & 0x7F) | ((_exRegs[1] & 0x20) << 2), memoryType);
|
|
} else {
|
|
MMC3::SelectCHRPage(slot, ((_exRegs[1] & 0x0E) << 7) | page, memoryType);
|
|
}
|
|
}
|
|
|
|
void SelectPRGPage(uint16_t slot, uint16_t page, PrgMemoryType memoryType = PrgMemoryType::PrgRom) override
|
|
{
|
|
uint8_t sbank = 0;
|
|
uint8_t bank = 0;
|
|
uint8_t mask = 0;
|
|
|
|
if(_exRegs[0] & 0x40) {
|
|
mask = 0x0F;
|
|
sbank = (_exRegs[1] & 0x10);
|
|
if(_exRegs[0] & 0x80) {
|
|
bank = ((_exRegs[1] & 0x03) << 4) | ((_exRegs[1] & 0x08) << 3) | (_exRegs[0] & 0x07) | (sbank >> 1);
|
|
}
|
|
} else {
|
|
mask = 0x1F;
|
|
if(_exRegs[0] & 0x80) {
|
|
bank = ((_exRegs[1] & 0x03) << 4) | ((_exRegs[1] & 0x08) << 3) | (_exRegs[0] & 0x0F);
|
|
}
|
|
}
|
|
|
|
if(_exRegs[0] & 0x80) {
|
|
bank <<= 1;
|
|
if(_exRegs[0] & 0x20) {
|
|
bank &= 0xFC;
|
|
MMC3::SelectPRGPage(0, bank);
|
|
MMC3::SelectPRGPage(1, bank + 1);
|
|
MMC3::SelectPRGPage(2, bank + 2);
|
|
MMC3::SelectPRGPage(3, bank + 3);
|
|
} else {
|
|
MMC3::SelectPRGPage(0, bank);
|
|
MMC3::SelectPRGPage(1, bank + 1);
|
|
MMC3::SelectPRGPage(2, bank);
|
|
MMC3::SelectPRGPage(3, bank + 1);
|
|
}
|
|
} else {
|
|
MMC3::SelectPRGPage(slot, ((_exRegs[1] & 0x03) << 5) | ((_exRegs[1] & 0x08) << 4) | (page & mask) | sbank);
|
|
}
|
|
}
|
|
}; |