ShuriZma
/
stella
mirror of https://github.com/stella-emu/stella.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Updated RWP stuff for DASH scheme. 

Again, this is a relatively untested BS scheme, with only one test ROM available.
This commit is contained in:
Stephen Anthony 2018-12-18 14:04:25 -03:30
parent 70fcd0f3b5
commit a26288c788
2 changed files with 25 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
src/emucore/Cart3EPlus.cxx
View File

@ -116,7 +116,6 @@ bool Cartridge3EPlus::poke(uInt16 address, uInt8 value)
if(address == BANK_SWITCH_HOTSPOT_RAM)
changed = bankRAM(value);
else if(address == BANK_SWITCH_HOTSPOT_ROM)
changed = bankROM(value);

40
src/emucore/CartDASH.cxx
View File

@ -92,28 +92,19 @@ uInt8 CartridgeDASH::peek(uInt16 address)
uInt32 bank = (address >> (ROM_BANK_TO_POWER - 1)) & 7; // convert to 512 byte bank index (0-7)
uInt16 imageBank = bankInUse[bank]; // the ROM/RAM bank that's here
if (imageBank == BANK_UNDEFINED) // an uninitialised bank?
if(imageBank == BANK_UNDEFINED) // an uninitialised bank?
{
// accessing invalid bank, so return should be... random?
value = mySystem->randGenerator().next();
}
else if (imageBank & BITMASK_ROMRAM) // a RAM bank
{
// Reading from the write port triggers an unwanted write
value = mySystem->getDataBusState(0xFF);
if(bankLocked())
return value;
else
else if(imageBank & BITMASK_ROMRAM) // a RAM bank
{
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;
@ -129,12 +120,27 @@ bool CartridgeDASH::poke(uInt16 address, uInt8 value)
if (address == BANK_SWITCH_HOTSPOT_RAM)
changed = bankRAM(value);
else if (address == BANK_SWITCH_HOTSPOT_ROM)
changed = bankROM(value);
if(!(address & 0x1000))
{
// Handle TIA space that we claimed above
mySystem->tia().poke(address, value);
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;
}
@ -183,9 +189,7 @@ void CartridgeDASH::bankRAMSlot(uInt16 bank)
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))];