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DMA: Fixed regression when trying to DMA to B bus registers using A bus address

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Fixes regression with Krusty
This commit is contained in:
Sour 2019-12-10 17:51:35 -05:00
parent 665d6e8a3d
commit ac7c2e9953
1 changed files with 2 additions and 2 deletions
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4
Core/MemoryManager.cpp
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@ -273,7 +273,7 @@ uint8_t MemoryManager::ReadDma(uint32_t addr, bool forBusA)
uint8_t value;
IMemoryHandler* handler = _mappings.GetHandler(addr);
if(handler) {
if(forBusA && addr >= 0x2100 && addr <= 0x21FF && handler == _registerHandlerB.get()) {
if(forBusA && handler == _registerHandlerB.get() && (addr & 0xFF00) == 0x2100) {
//Trying to read from bus B using bus A returns open bus
value = _openBus;
} else if(handler == _registerHandlerA.get()) {
@ -338,7 +338,7 @@ void MemoryManager::WriteDma(uint32_t addr, uint8_t value, bool forBusA)
IMemoryHandler* handler = _mappings.GetHandler(addr);
if(handler) {
if(forBusA && handler == _registerHandlerB.get()) {
if(forBusA && handler == _registerHandlerB.get() && (addr & 0xFF00) == 0x2100) {
//Trying to write to bus B using bus A does nothing
} else if(handler == _registerHandlerA.get()) {
uint16_t regAddr = addr & 0xFFFF;