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Updated RWP stuff for '3E+' scheme. 

This is currently mostly untested, since this scheme isn't widespread and has only a few test ROMS.
This commit is contained in:
Stephen Anthony 2018-12-18 10:59:29 -03:30
parent 56669c5449
commit 70fcd0f3b5
1 changed files with 23 additions and 18 deletions
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41
src/emucore/Cart3EPlus.cxx
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@ -96,20 +96,11 @@ uInt8 Cartridge3EPlus::peek(uInt16 address)
}
else if(imageBank & BITMASK_ROMRAM) // a RAM bank
{
// Reading from the write port triggers an unwanted write
value = mySystem->getDataBusState(0xFF);
Int32 ramBank = imageBank & BIT_BANK_MASK; // discard irrelevant bits
Int32 offset = ramBank << RAM_BANK_TO_POWER; // base bank address in RAM
offset += (address & BITMASK_RAM_BANK); // + byte offset in RAM bank
if(bankLocked())
return value;
else
{
Int32 ramBank = imageBank & BIT_BANK_MASK; // discard irrelevant bits
Int32 offset = ramBank << RAM_BANK_TO_POWER; // base bank address in RAM
offset += (address & BITMASK_RAM_BANK); // + byte offset in RAM bank
myRAM[offset] = value;
triggerReadFromWritePort(peekAddress);
return value;
}
return peekRAM(myRAM[offset], peekAddress);
}
return value;
@ -129,8 +120,24 @@ bool Cartridge3EPlus::poke(uInt16 address, uInt8 value)
else if(address == BANK_SWITCH_HOTSPOT_ROM)
changed = bankROM(value);
// Handle TIA space that we claimed above
mySystem->tia().poke(address, value);
if(!(address & 0x1000))
{
// Handle TIA space that we claimed above
changed = changed || mySystem->tia().poke(address, value);
}
else
{
uInt32 bankNumber = (address >> RAM_BANK_TO_POWER) & 7; // now 512 byte bank # (ie: 0-7)
Int16 whichBankIsThere = bankInUse[bankNumber]; // ROM or RAM bank reference
if(whichBankIsThere & BITMASK_ROMRAM)
{
uInt32 byteOffset = address & BITMASK_RAM_BANK;
uInt32 baseAddress = ((whichBankIsThere & BIT_BANK_MASK) << RAM_BANK_TO_POWER) + byteOffset;
pokeRAM(myRAM[baseAddress], address, value);
changed = true;
}
}
return changed;
}
@ -181,9 +188,7 @@ void Cartridge3EPlus::bankRAMSlot(uInt16 bank)
// << "start=" << std::hex << start << ", end=" << end << endl << endl;
for(uInt16 addr = start; addr <= end; addr += System::PAGE_SIZE)
{
if(upper)
access.directPokeBase = &myRAM[startCurrentBank + (addr & (RAM_BANK_SIZE - 1))];
else
if(!upper)
access.directPeekBase = &myRAM[startCurrentBank + (addr & (RAM_BANK_SIZE - 1))];
access.codeAccessBase = &myCodeAccessBase[mySize + startCurrentBank + (addr & (RAM_BANK_SIZE - 1))];