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Only access SCSI device at 0xC0xxxxxx if it has been configured to do so

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Fixes some step 1.5 games not working in last update
This commit is contained in:
gm-matthew 2024-05-04 19:43:02 +01:00
parent 2245fca796
commit 3e394d1257
3 changed files with 26 additions and 8 deletions
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8
Src/Model3/53C810.cpp
View file

@ -458,6 +458,14 @@ UINT32 C53C810::ReadPCIConfigSpace(unsigned device, unsigned reg, unsigned bits,
void C53C810::WritePCIConfigSpace(unsigned device, unsigned reg, unsigned bits, unsigned offset, UINT32 data)
{
DebugLog("53C810 PCI %d-bit write request for reg=%02X, data=%08X\n", bits, reg, data);
if (reg == 4) // set base address of SCSI device
baseAddress = data & 0xFF;
}
UINT8 C53C810::GetBaseAddress(void)
{
return baseAddress;
}
void C53C810::Reset(void)

10
Src/Model3/53C810.h
View file

@ -156,6 +156,13 @@ public:
*/
void WritePCIConfigSpace(unsigned device, unsigned reg, unsigned bits, unsigned width, UINT32 data);
/*
* GetBaseAddress(void):
*
* Retrieves the base address of the SCSI device.
*/
UINT8 GetBaseAddress(void);
/*
* Reset(void):
*
@ -201,6 +208,9 @@ private:
// IRQ controller and IRQ identifier for this SCSI controller
CIRQ *IRQ;
unsigned scsiIRQ;
// Base address of the SCSI device (varies by game)
UINT8 baseAddress;
};

16
Src/Model3/Model3.cpp
View file

@ -1017,7 +1017,7 @@ UINT8 CModel3::Read8(UINT32 addr)
// 53C810 SCSI
case 0xC0: // only on Step 1.x
#ifndef NET_BOARD
if (m_stepping > 0x15)
if (m_stepping > 0x15 || SCSI.GetBaseAddress() != 0xC0)
{
//printf("Model3 : Read8 %x\n", addr);
break;
@ -1049,7 +1049,7 @@ UINT8 CModel3::Read8(UINT32 addr)
break;
}
}
else if (m_stepping > 0x15) break;
else if (m_stepping > 0x15 || SCSI.GetBaseAddress() != 0xC0) break;
#endif
case 0xF9:
case 0xC1:
@ -1311,7 +1311,7 @@ UINT32 CModel3::Read32(UINT32 addr)
// 53C810 SCSI
case 0xC0: // only on Step 1.x
#ifndef NET_BOARD
if (m_stepping > 0x15) // check for Step 1.x
if (m_stepping > 0x15 || SCSI.GetBaseAddress() != 0xC0) // check for Step 1.x
break;
#endif
#ifdef NET_BOARD
@ -1346,7 +1346,7 @@ UINT32 CModel3::Read32(UINT32 addr)
}
}
else if (m_stepping > 0x15) break;
else if (m_stepping > 0x15 || SCSI.GetBaseAddress() != 0xC0) break;
#endif
case 0xF9:
case 0xC1:
@ -1468,7 +1468,7 @@ void CModel3::Write8(UINT32 addr, UINT8 data)
// 53C810 SCSI
case 0xC0: // only on Step 1.x
#ifndef NET_BOARD
if (m_stepping > 0x15)
if (m_stepping > 0x15 || SCSI.GetBaseAddress() != 0xC0)
goto Unknown8;
#endif
#ifdef NET_BOARD
@ -1503,7 +1503,7 @@ void CModel3::Write8(UINT32 addr, UINT8 data)
break;
}
else if (m_stepping > 0x15) break;
else if (m_stepping > 0x15 || SCSI.GetBaseAddress() != 0xC0) break;
#endif
case 0xF9:
case 0xC1:
@ -1790,7 +1790,7 @@ void CModel3::Write32(UINT32 addr, UINT32 data)
// 53C810 SCSI
case 0xC0: // step 1.x only
#ifndef NET_BOARD
if (m_stepping > 0x15)
if (m_stepping > 0x15 || SCSI.GetBaseAddress() != 0xC0)
goto Unknown32;
#endif
#ifdef NET_BOARD
@ -1825,7 +1825,7 @@ void CModel3::Write32(UINT32 addr, UINT32 data)
break;
}
else if (m_stepping > 0x15) break;
else if (m_stepping > 0x15 || SCSI.GetBaseAddress() != 0xC0) break;
#endif
case 0xF9:
case 0xC1: