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Fix for write to 0xCFFF (wasn't implemented), and clear IO_SELECT_InternalROM on 0xC006 (SLOTCXROM) access (#392)

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This commit is contained in:
tomcw 2017-03-16 22:28:06 +00:00
parent 87862bcf28
commit 5470febbf8
1 changed files with 3 additions and 9 deletions
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12
source/Memory.cpp
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@ -535,7 +535,7 @@ BYTE __stdcall IORead_Cxxx(WORD programcounter, WORD address, BYTE write, BYTE v
if (address == 0xCFFF)
{
// Disable expansion ROM at [$C800..$CFFF]
// . SSC will disable on an access to $CFxx - but ROM only writes to $CFFF, so it doesn't matter
// . SSC will disable on an access to $CFxx - but ROM only access $CFFF, so it doesn't matter
IO_SELECT = 0;
IO_SELECT_InternalROM = 0;
g_uPeripheralRomSlot = 0;
@ -659,15 +659,9 @@ BYTE __stdcall IORead_Cxxx(WORD programcounter, WORD address, BYTE write, BYTE v
return mem[address];
}
// TODO: Check if a write to [C800..CFFF] can set IO_STROBE=1 (like the IORead_Cxxx case does)
BYTE __stdcall IOWrite_Cxxx(WORD programcounter, WORD address, BYTE write, BYTE value, ULONG nCyclesLeft)
{
if (IsPotentialNoSlotClockAccess(address))
{
g_NoSlotClock.Write(address);
}
return 0;
return IORead_Cxxx(programcounter, address, write, value, nCyclesLeft); // GH#392
}
//===========================================================================
@ -1641,7 +1635,6 @@ BYTE __stdcall MemSetPaging(WORD programcounter, WORD address, BYTE write, BYTE
if (!write) // GH#392
{
BOOL bWriteRam = (address & 1);
// g_bLastWriteRam = 1; // note: because diags.do doesn't set switches twice!
if (g_bLastWriteRam && bWriteRam)
SetMemMode(memmode | MF_WRITERAM);
g_bLastWriteRam = bWriteRam;
@ -1716,6 +1709,7 @@ BYTE __stdcall MemSetPaging(WORD programcounter, WORD address, BYTE write, BYTE
// Disable Internal ROM
// . Similar to $CFFF access
// . None of the peripheral cards can be driving the bus - so use the null ROM
IO_SELECT_InternalROM = 0; // GH#392
memset(pCxRomPeripheral+0x800, 0, FIRMWARE_EXPANSION_SIZE);
memset(mem+FIRMWARE_EXPANSION_BEGIN, 0, FIRMWARE_EXPANSION_SIZE);
g_eExpansionRomType = eExpRomNull;