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Allow disk write protect read with drive off - Fixes #389

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- Added comments
- Removed mistaken check for writing nibbles < 0x80
- Reset forces all switches off
This commit is contained in:
Nick Westgate 2017-03-08 23:13:56 +13:00
parent 3d6c10bad9
commit 16b81133e0
1 changed files with 12 additions and 4 deletions
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16
source/Disk.cpp
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@ -116,7 +116,7 @@ static BYTE floppylatch = 0;
static BOOL floppymotoron = 0;
static BOOL floppyloadmode = 0; // for efficiency this is not used; it's extremely unlikely to affect emulation (nickw)
static BOOL floppywritemode = 0;
static WORD phases = 0; // state bits for stepper magnet phases 0 - 3
static WORD phases = 0; // state bits for stepper magnet phases 0 - 3
static bool g_bSaveDiskImage = true; // Save the DiskImage name to Registry
static UINT g_uSlot = 0;
@ -789,6 +789,8 @@ static void __stdcall DiskReadWrite(WORD pc, WORD addr, BYTE bWrite, BYTE d, ULO
return;
}
// Should really test for drive off - after 1 second drive off delay (UTA2E page 9-13)
// but Sherwood Forest sets shift mode and reads with the drive off, so don't check for now
if (!floppywritemode)
{
floppylatch = *(fptr->trackimage + fptr->byte);
@ -796,7 +798,7 @@ static void __stdcall DiskReadWrite(WORD pc, WORD addr, BYTE bWrite, BYTE d, ULO
LOG_DISK("read %4X = %2X\r\n", fptr->byte, floppylatch);
#endif
}
else if ((floppylatch & 0x80) && !fptr->bWriteProtected) // && floppywritemode
else if (!fptr->bWriteProtected) // && floppywritemode
{
*(fptr->trackimage + fptr->byte) = floppylatch;
fptr->trackimagedirty = 1;
@ -816,7 +818,11 @@ static void __stdcall DiskReadWrite(WORD pc, WORD addr, BYTE bWrite, BYTE d, ULO
void DiskReset(void)
{
// RESET forces all switches off (UTA2E Table 9.1)
currdrive = 0;
floppymotoron = 0;
floppyloadmode = 0;
floppywritemode = 0;
phases = 0;
}
@ -884,9 +890,11 @@ static void __stdcall DiskLoadWriteProtect(WORD, WORD, BYTE write, BYTE value, U
/* floppyloadmode = 1; */
if (!write)
{
if (floppymotoron && !floppywritemode)
// Should really test for drive off - after 1 second drive off delay (UTA2E 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 (UTA2E page 9-7) but we don't implement that
// Phase 1 on also forces write protect in the Disk II drive (UTA2E page 9-7) but we don't implement that
if (g_aFloppyDisk[currdrive].bWriteProtected)
floppylatch |= 0x80;
else