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IDE: bugfix C/H/S address increment code NOT to assume 16 heads/track

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This commit is contained in:
Jonathan Campbell 2013-10-27 13:31:32 -07:00
parent f2754af41a
commit 860379ae26
1 changed files with 2 additions and 2 deletions
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4
src/hardware/ide.cpp
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@ -501,7 +501,7 @@ void IDEATADevice::io_completion() {
if (((++lba[0])&0xFF) > sects) { /* increment sector */
lba[0] = 1;
/* if sector carry, increment head */
if ((drivehead&0xF) == 0xF) { /* if head carry, increment 7:0 of track */
if (((drivehead&0xF)+1) == heads) { /* if head carry, increment 7:0 of track */
drivehead &= 0xF0;
if (((++lba[1])&0xFF) == 0) { /* if 7:0 carry then incrment 15:8 */
if (((++lba[2])&0xFF) == 0) {
@ -1597,7 +1597,7 @@ static void IDE_DelayedCommand(Bitu idx/*which IDE controller*/) {
if (((++ata->lba[0])&0xFF) > ata->sects) { /* increment sector */
ata->lba[0] = 1;
/* if sector carry, increment head */
if ((ata->drivehead&0xF) == 0xF) { /* if head carry, increment 7:0 of track */
if (((ata->drivehead&0xF)+1) == ata->heads) { /* if head carry, increment 7:0 of track */
ata->drivehead &= 0xF0;
if (((++ata->lba[1])&0xFF) == 0) { /* if 7:0 carry then incrment 15:8 */
if (((++ata->lba[2])&0xFF) == 0) {