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DiskII: allow reading of write-protect state when in write mode (#537)

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tomcw 2018-02-11 14:52:21 +00:00
parent 2295964c5f
commit 82fdf1ab6a
1 changed files with 13 additions and 11 deletions
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24
source/Disk.cpp
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@ -996,20 +996,22 @@ bool DiskSelect(const int iDrive)
//===========================================================================
static void __stdcall DiskLoadWriteProtect(WORD, WORD, BYTE write, BYTE value, ULONG) {
static void __stdcall DiskLoadWriteProtect(WORD, WORD, BYTE write, BYTE value, ULONG)
{
/* floppyloadmode = 1; */
if (!write)
{
// Should really test for drive off - after 1 second drive off delay (UTAIIe page 9-13)
// but Gemstone Warrior sets load mode with the drive off, so don't check for now
if (!floppywritemode)
{
// Phase 1 on also forces write protect in the Disk II drive (UTAIIe page 9-7) but we don't implement that
if (g_aFloppyDisk[currdrive].bWriteProtected)
floppylatch |= 0x80;
else
floppylatch &= 0x7F;
}
// Notes:
// . Should really test for drive off - after 1 second drive off delay (UTAIIe page 9-13)
// but Gemstone Warrior sets load mode with the drive off, so don't check for now
// . Phase 1 on also forces write protect in the Disk II drive (UTAIIe page 9-7) but we don't implement that
// . write mode doesn't prevent reading write protect (GH#537):
// "If for some reason the above write protect check were entered with the READ/WRITE switch in WRITE,
// the write protect switch would still be read correctly" (UTAIIe page 9-21)
if (g_aFloppyDisk[currdrive].bWriteProtected)
floppylatch |= 0x80;
else
floppylatch &= 0x7F;
}
}