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DiskII: fixes for Wasteland for both .nib & .woz images (#733)

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tomcw 2019-12-08 16:23:29 +00:00
parent 6af3b0b028
commit ba7a4005b0
1 changed files with 7 additions and 2 deletions
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9
source/Disk.cpp
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@ -51,7 +51,6 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
// . if false: Used by ImageReadTrack() to skew the sectors in a track (for .do, .dsk, .po 5.25" images).
// . if true && m_floppyMotorOn, then this is a condition for full-speed (unthrottled) emulation mode.
// . if false && I/O ReadWrite($C0EC) && drive is spinning, then advance the track buffer's nibble index (to simulate spinning).
// . if I/O ReadWrite($C0EC) && read, then depending on true/false support partial nibble reads for different gaps between consecutive accesses.
// Also m_enhanceDisk is persisted to the save-state, so it's an attribute of the DiskII interface card.
Disk2InterfaceCard::Disk2InterfaceCard(void)
@ -907,8 +906,9 @@ void __stdcall Disk2InterfaceCard::ReadWrite(WORD pc, WORD addr, BYTE bWrite, BY
// Support partial nibble read if disk reads are very close: (GH#582)
// . 6 cycles (1st->2nd read) for DOS 3.3 / $BD34: "read with delays to see if disk is spinning." (Beneath Apple DOS)
// . 6 cycles (1st->2nd read) for Curse of the Azure Bonds (loop to see if disk is spinning)
// . 25 cycles or higher fails for Legacy of the Ancients (GH#733)
// . 31 cycles is the max for a partial 8-bit nibble
const ULONG kReadAccessThreshold = m_enhanceDisk ? 6 : 31;
const ULONG kReadAccessThreshold = 6; // Same for enhanced/authentic modes
if (nReadCycleDiff <= kReadAccessThreshold)
{
@ -1124,6 +1124,8 @@ void Disk2InterfaceCard::DataLatchReadWOZ(WORD pc, WORD addr, UINT bitCellRemain
}
#endif
UINT extraLatchDelay = (UINT)floppy.m_extraCycles ? 1 : 0; // GH#733
for (UINT i = 0; i < bitCellRemainder; i++)
{
BYTE n = floppy.m_trackimage[floppy.m_byte];
@ -1161,6 +1163,9 @@ void Disk2InterfaceCard::DataLatchReadWOZ(WORD pc, WORD addr, UINT bitCellRemain
if (m_latchDelay)
{
m_latchDelay += extraLatchDelay;
extraLatchDelay = 0;
m_latchDelay -= 4;
if (m_latchDelay < 0)
m_latchDelay = 0;