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Support INTC8ROM: extend logic for IO_SELECT_InternalROM and rename to INTC8ROM. (Fixes #422, #423)

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This commit is contained in:
tomcw 2017-05-21 17:35:35 +01:00
parent 04e9f6bdb9
commit 12eed08bea
1 changed files with 39 additions and 25 deletions
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64
source/Memory.cpp
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@ -463,8 +463,8 @@ static iofunction IOWrite_C0xx[8] =
IOWrite_C07x, // Joystick/Ramworks
};
static BYTE IO_SELECT;
static BYTE IO_SELECT_InternalROM;
static BYTE IO_SELECT = 0;
static bool INTC8ROM = false; // UTAIIe:5-28
static BYTE* ExpansionRom[NUM_SLOTS];
@ -519,7 +519,7 @@ static bool IsCardInSlot(const UINT uSlot);
// . Enable2 = I/O STROBE' (6502 accesses [$C800..$CFFF])
// TODO:
// . IO_SELECT and IO_SELECT_InternalROM are sticky - they only getting reset by $CFFF and MemReset()
// . IO_SELECT and INTC8ROM are sticky - they only getting reset by $CFFF and MemReset()
// . Check Sather UAIIe, but I assume that a 6502 access to a non-$Csxx (and non-expansion ROM) location will clear IO_SELECT
// NB. ProDOS boot sets IO_SELECT=0x04 (its scan for boot devices?), as slot2 contains a card (ie. SSC) with an expansion ROM.
@ -537,15 +537,19 @@ static bool IsCardInSlot(const UINT uSlot);
// (*) SLOTCXROM'
// -----------
//
// INTC8ROM: Unreadable soft switch (UTAIIe:5-28)
// . Set: Access to $C3XX with SLOTC3ROM reset
// . Reset: Access to $CFFF or an MMU reset
//
BYTE __stdcall IORead_Cxxx(WORD programcounter, WORD address, BYTE write, BYTE value, ULONG nCyclesLeft)
{
if (address == 0xCFFF)
{
// Disable expansion ROM at [$C800..$CFFF]
// . SSC will disable on an access to $CFxx - but ROM only access $CFFF, so it doesn't matter
// . SSC will disable on an access to $CFxx - but ROM only accesses $CFFF, so it doesn't matter
IO_SELECT = 0;
IO_SELECT_InternalROM = 0;
INTC8ROM = false;
g_uPeripheralRomSlot = 0;
if (SW_SLOTCXROM)
@ -578,12 +582,14 @@ BYTE __stdcall IORead_Cxxx(WORD programcounter, WORD address, BYTE write, BYTE v
if ((SW_SLOTC3ROM) && ExpansionRom[uSlot])
IO_SELECT |= 1<<uSlot; // Slot3 & Peripheral ROM
else if (!SW_SLOTC3ROM)
IO_SELECT_InternalROM = 1; // Slot3 & Internal ROM
INTC8ROM = true; // Slot3 & Internal ROM
}
}
else if ((address >= FIRMWARE_EXPANSION_BEGIN) && (address <= FIRMWARE_EXPANSION_END))
{
IO_STROBE = 1;
if (!INTC8ROM) // [GH#423] UTAIIe:5-28: if INTCXROM or INTC8ROM is configured for internal response,
// then access to $C800-$CFFF results in ROMEN1' low (active) and I/O STROBE' high (inactive)
IO_STROBE = 1;
}
//
@ -610,7 +616,7 @@ BYTE __stdcall IORead_Cxxx(WORD programcounter, WORD address, BYTE write, BYTE v
g_uPeripheralRomSlot = uSlot;
}
}
else if (IO_SELECT_InternalROM && IO_STROBE && (g_eExpansionRomType != eExpRomInternal))
else if (INTC8ROM && (g_eExpansionRomType != eExpRomInternal))
{
// Enable Internal ROM
// . Get this for PR#3
@ -632,12 +638,18 @@ BYTE __stdcall IORead_Cxxx(WORD programcounter, WORD address, BYTE write, BYTE v
// !SW_SLOTC3ROM = Internal ROM: $C300-C3FF
// !SW_SLOTCXROM = Internal ROM: $C100-CFFF
if ((address >= APPLE_SLOT_BEGIN) && (address <= APPLE_SLOT_END)) // Don't care about state of SW_SLOTC3ROM
IO_SELECT_InternalROM = 1;
if ((address >= 0xC300) && (address <= 0xC3FF))
{
if (!SW_SLOTC3ROM) // GH#423
INTC8ROM = true;
}
else if ((address >= FIRMWARE_EXPANSION_BEGIN) && (address <= FIRMWARE_EXPANSION_END))
IO_STROBE = 1;
{
if (!INTC8ROM) // GH#423
IO_STROBE = 1;
}
if (!SW_SLOTCXROM && IO_SELECT_InternalROM && IO_STROBE && (g_eExpansionRomType != eExpRomInternal))
if (INTC8ROM && (g_eExpansionRomType != eExpRomInternal))
{
// Enable Internal ROM
memcpy(mem+FIRMWARE_EXPANSION_BEGIN, pCxRomInternal+0x800, FIRMWARE_EXPANSION_SIZE);
@ -1168,7 +1180,7 @@ bool MemIsAddrCodeMemory(const USHORT addr)
if (g_eExpansionRomType == eExpRomNull)
{
if (IO_SELECT || IO_SELECT_InternalROM) // Was at $Csxx and now in [$C800..$CFFF]
if (IO_SELECT || INTC8ROM) // Was at $Csxx and now in [$C800..$CFFF]
return true;
return false;
@ -1439,7 +1451,7 @@ void MemReset()
// Init the I/O ROM vars
IO_SELECT = 0;
IO_SELECT_InternalROM = 0;
INTC8ROM = false;
g_eExpansionRomType = eExpRomNull;
g_uPeripheralRomSlot = 0;
@ -1771,14 +1783,16 @@ _done_saturn:
{
if (SW_SLOTCXROM)
{
// 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;
g_uPeripheralRomSlot = 0;
if (!INTC8ROM) // GH#423
{
// Disable Internal ROM
// . Similar to $CFFF access
// . None of the peripheral cards can be driving the bus - so use the null ROM
memset(pCxRomPeripheral+0x800, 0, FIRMWARE_EXPANSION_SIZE);
memset(mem+FIRMWARE_EXPANSION_BEGIN, 0, FIRMWARE_EXPANSION_SIZE);
g_eExpansionRomType = eExpRomNull;
g_uPeripheralRomSlot = 0;
}
IoHandlerCardsIn();
}
else
@ -1837,7 +1851,7 @@ void MemSetSnapshot_v1(const DWORD MemMode, const BOOL LastWriteRam, const BYTE*
#define SS_YAML_KEY_MEMORYMODE "Memory Mode"
#define SS_YAML_KEY_LASTRAMWRITE "Last RAM Write"
#define SS_YAML_KEY_IOSELECT "IO_SELECT"
#define SS_YAML_KEY_IOSELECT_INT "IO_SELECT_InternalROM"
#define SS_YAML_KEY_IOSELECT_INT "IO_SELECT_InternalROM" // INTC8ROM
#define SS_YAML_KEY_EXPANSIONROMTYPE "Expansion ROM Type"
#define SS_YAML_KEY_PERIPHERALROMSLOT "Peripheral ROM Slot"
@ -1896,7 +1910,7 @@ void MemSaveSnapshot(YamlSaveHelper& yamlSaveHelper)
yamlSaveHelper.SaveHexUint32(SS_YAML_KEY_MEMORYMODE, memmode);
yamlSaveHelper.SaveUint(SS_YAML_KEY_LASTRAMWRITE, g_bLastWriteRam ? 1 : 0);
yamlSaveHelper.SaveHexUint8(SS_YAML_KEY_IOSELECT, IO_SELECT);
yamlSaveHelper.SaveHexUint8(SS_YAML_KEY_IOSELECT_INT, IO_SELECT_InternalROM);
yamlSaveHelper.SaveHexUint8(SS_YAML_KEY_IOSELECT_INT, INTC8ROM ? 1 : 0);
yamlSaveHelper.SaveUint(SS_YAML_KEY_EXPANSIONROMTYPE, (UINT) g_eExpansionRomType);
yamlSaveHelper.SaveUint(SS_YAML_KEY_PERIPHERALROMSLOT, g_uPeripheralRomSlot);
}
@ -1912,7 +1926,7 @@ bool MemLoadSnapshot(YamlLoadHelper& yamlLoadHelper)
SetMemMode( yamlLoadHelper.LoadUint(SS_YAML_KEY_MEMORYMODE) );
g_bLastWriteRam = yamlLoadHelper.LoadUint(SS_YAML_KEY_LASTRAMWRITE) ? TRUE : FALSE;
IO_SELECT = (BYTE) yamlLoadHelper.LoadUint(SS_YAML_KEY_IOSELECT);
IO_SELECT_InternalROM = (BYTE) yamlLoadHelper.LoadUint(SS_YAML_KEY_IOSELECT_INT);
INTC8ROM = yamlLoadHelper.LoadUint(SS_YAML_KEY_IOSELECT_INT) ? true : false;
g_eExpansionRomType = (eExpansionRomType) yamlLoadHelper.LoadUint(SS_YAML_KEY_EXPANSIONROMTYPE);
g_uPeripheralRomSlot = yamlLoadHelper.LoadUint(SS_YAML_KEY_PERIPHERALROMSLOT);