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Tweak - Now only remove Disk][ f/w's track stepping delay in *enhanced* disk mode

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- Additionally fix the ADC chksum for "The CIA Files"
This commit is contained in:
tomch 2009-02-01 10:18:37 +00:00
parent 6e24203ad8
commit 7ee8d10fd5
1 changed files with 11 additions and 4 deletions
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15
AppleWin/source/Disk.cpp
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@ -759,10 +759,17 @@ void DiskLoadRom(LPBYTE pCxRomPeripheral, UINT uSlot)
memcpy(pCxRomPeripheral + uSlot*APPLE_SLOT_SIZE, pData, DISK2_FW_SIZE);
// TODO/FIXME: HACK! REMOVE A WAIT ROUTINE FROM THE DISK CONTROLLER'S FIRMWARE
*(pCxRomPeripheral + (uSlot*APPLE_SLOT_SIZE) + 0x4C) = 0xA9;
*(pCxRomPeripheral + (uSlot*APPLE_SLOT_SIZE) + 0x4D) = 0x00;
*(pCxRomPeripheral + (uSlot*APPLE_SLOT_SIZE) + 0x4E) = 0xEA;
if (enhancedisk)
{
// Disable the track stepping delay in the Disk II controller firmware
*(pCxRomPeripheral + (uSlot*APPLE_SLOT_SIZE) + 0x4C) = 0xA9;
*(pCxRomPeripheral + (uSlot*APPLE_SLOT_SIZE) + 0x4D) = 0x00;
*(pCxRomPeripheral + (uSlot*APPLE_SLOT_SIZE) + 0x4E) = 0xEA;
// The following maintains the firmware's ADC checksum (used by "The CIA Files")
// Correcting for both ADC and EOR checksums is not possible in this case.
*(pCxRomPeripheral + (uSlot*APPLE_SLOT_SIZE) + 0x4B) = 0x87; // was 0x56
}
//