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return maximal cylinder number instead of cylinder count on int13/get driveparams (thanks to formatc)

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2851
This commit is contained in:
Sebastian Strohhäcker 2007-05-02 18:56:15 +00:00
parent eb90bbf252
commit 2a7805656a
1 changed files with 7 additions and 3 deletions
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10
src/ints/bios_disk.cpp
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@ -16,7 +16,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: bios_disk.cpp,v 1.33 2007-01-21 16:21:22 c2woody Exp $ */
/* $Id: bios_disk.cpp,v 1.34 2007-05-02 18:56:15 c2woody Exp $ */
#include "dosbox.h"
#include "callback.h"
@ -436,16 +436,20 @@ static Bitu INT13_DiskHandler(void) {
if(driveInactive(drivenum)) {
last_status = 0x07;
reg_ah = last_status;
CALLBACK_SCF(true);
CALLBACK_SCF(true);
return CBRET_NONE;
}
reg_ax = 0x00;
reg_bl = imageDiskList[drivenum]->GetBiosType();
Bit32u tmpheads, tmpcyl, tmpsect, tmpsize;
imageDiskList[drivenum]->Get_Geometry(&tmpheads, &tmpcyl, &tmpsect, &tmpsize);
if (tmpcyl==0) LOG(LOG_BIOS,LOG_ERROR)("INT13 DrivParm: cylinder count zero!");
else tmpcyl--; // cylinder count -> max cylinder
if (tmpheads==0) LOG(LOG_BIOS,LOG_ERROR)("INT13 DrivParm: head count zero!");
else tmpheads--; // head count -> max head
reg_ch = tmpcyl & 0xff;
reg_cl = (((tmpcyl >> 2) & 0xc0) | (tmpsect & 0x3f));
reg_dh = tmpheads-1;
reg_dh = tmpheads;
last_status = 0x00;
if (reg_dl&0x80) { // harddisks
reg_dl = 0;