64 lines
1.5 KiB
C
64 lines
1.5 KiB
C
|
#pragma once
|
||
|
|
#include "stdafx.h"
|
||
|
|
#include "BaseMapper.h"
|
||
|
|
#include "CPU.h"
|
||
|
|
|
||
|
|
class Smb2j : public BaseMapper
|
||
|
|
{
|
||
|
|
private:
|
||
|
|
uint16_t _irqCounter;
|
||
|
|
bool _irqEnabled;
|
||
|
|
|
||
|
|
protected:
|
||
|
|
uint16_t GetPRGPageSize() { return 0x1000; }
|
||
|
|
uint16_t GetCHRPageSize() { return 0x2000; }
|
||
|
|
uint16_t RegisterStartAddress() { return 0x4122; }
|
||
|
|
uint16_t RegisterEndAddress() { return 0x4122; }
|
||
|
|
|
||
|
|
void InitMapper() override
|
||
|
|
{
|
||
|
|
SelectPrgPage4x(0, 0);
|
||
|
|
SelectPrgPage4x(1, 4);
|
||
|
|
SelectCHRPage(0, 0);
|
||
|
|
|
||
|
|
if(_prgSize >= 0x10000) {
|
||
|
|
AddRegisterRange(0x4022, 0x4022, MemoryOperation::Write);
|
||
|
|
}
|
||
|
|
|
||
|
|
SetCpuMemoryMapping(0x5000, 0x5FFF, GetPRGPageCount() - 3, PrgMemoryType::PrgRom);
|
||
|
|
SetCpuMemoryMapping(0x6000, 0x6FFF, GetPRGPageCount() - 2, PrgMemoryType::PrgRom);
|
||
|
|
SetCpuMemoryMapping(0x7000, 0x7FFF, GetPRGPageCount() - 1, PrgMemoryType::PrgRom);
|
||
|
|
|
||
|
|
_irqCounter = 0;
|
||
|
|
_irqEnabled = false;
|
||
|
|
}
|
||
|
|
|
||
|
|
void StreamState(bool saving) override
|
||
|
|
{
|
||
|
|
BaseMapper::StreamState(saving);
|
||
|
|
Stream(_irqCounter, _irqEnabled);
|
||
|
|
}
|
||
|
|
|
||
|
|
void ProcessCpuClock() override
|
||
|
|
{
|
||
|
|
if(_irqEnabled) {
|
||
|
|
_irqCounter = (_irqCounter + 1) & 0xFFF;
|
||
|
|
if(_irqCounter == 0) {
|
||
|
|
_irqEnabled = false;
|
||
|
|
CPU::SetIRQSource(IRQSource::External);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void WriteRegister(uint16_t addr, uint8_t value) override
|
||
|
|
{
|
||
|
|
if(addr == 0x4022) {
|
||
|
|
SelectPrgPage4x(0, (value & 0x01) << 2);
|
||
|
|
SelectPrgPage4x(1, ((value & 0x01) << 2) + 4);
|
||
|
|
} else if(addr == 0x4122) {
|
||
|
|
_irqEnabled = (value & 0x03) != 0;
|
||
|
|
_irqCounter = 0;
|
||
|
|
CPU::ClearIRQSource(IRQSource::External);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
};
|