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Mapper 15: Improved accuracy (#800)

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fixed 2 inaccuracies:
- not making CHR read only in modes 0 and 3
- always using last bank in mode 1 instead of using bank B | 7
This commit is contained in:
norill 2020-04-08 04:28:19 +02:00 • committed by GitHub
parent 48c2752d3b
commit 7c7b87670e
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 6 additions and 2 deletions
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8
Core/Mapper15.h
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@ -24,7 +24,11 @@ protected:
uint8_t subBank = value >> 7;
uint8_t bank = (value & 0x7F) << 1;
switch(addr & 0x03) {
uint8_t mode = addr & 0x03;
SetPpuMemoryMapping(0, 0x1FFF, 0, ChrMemoryType::Default, (mode == 0 || mode == 3) ? MemoryAccessType::Read : MemoryAccessType::ReadWrite);
switch(mode) {
case 0:
SelectPRGPage(0, bank ^ subBank);
SelectPRGPage(1, (bank + 1) ^ subBank);
@ -37,7 +41,7 @@ protected:
bank |= subBank;
SelectPRGPage(0, bank);
SelectPRGPage(1, bank + 1);
bank = ((addr & 0x02) ? bank : 0xFE) | subBank;
bank = ((mode == 3) ? bank : (bank | 0x14)) | subBank;
SelectPRGPage(2, bank + 0);
SelectPRGPage(3, bank + 1);
break;