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VRC1: Allow oversized PRG

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This commit is contained in:
Sour 2018-08-19 20:25:15 -04:00
parent 005affab4b
commit f25e6f5532
1 changed files with 7 additions and 3 deletions
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10
Core/VRC1.h
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@ -32,8 +32,12 @@ protected:
void WriteRegister(uint16_t addr, uint8_t value) override void WriteRegister(uint16_t addr, uint8_t value) override
{ {
//TODO: Create a setting to enable/disable oversized PRG
bool allowOversizedPrg = true;
uint8_t prgMask = allowOversizedPrg ? 0xFF : 0x0F;
switch(addr & 0xF000) { switch(addr & 0xF000) {
case 0x8000: SelectPRGPage(0, value & 0x0F); break; case 0x8000: SelectPRGPage(0, value & prgMask); break;
case 0x9000: case 0x9000:
if(GetMirroringType() != MirroringType::FourScreens) { if(GetMirroringType() != MirroringType::FourScreens) {
@ -45,8 +49,8 @@ protected:
UpdateChrBanks(); UpdateChrBanks();
break; break;
case 0xA000: SelectPRGPage(1, value & 0x0F); break; case 0xA000: SelectPRGPage(1, value & prgMask); break;
case 0xC000: SelectPRGPage(2, value & 0x0F); break; case 0xC000: SelectPRGPage(2, value & prgMask); break;
case 0xE000: case 0xE000:
_chrBanks[0] = (_chrBanks[0] & 0x10) | (value & 0x0F); _chrBanks[0] = (_chrBanks[0] & 0x10) | (value & 0x0F);