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Keeping the timer more in sync.(h-a-l-9000)

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2760
This commit is contained in:
Peter Veenstra 2007-01-13 09:57:25 +00:00
parent e92b82a8e2
commit bc0a6460ac
1 changed files with 5 additions and 3 deletions
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8
src/hardware/timer.cpp
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@ -16,7 +16,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: timer.cpp,v 1.41 2007-01-08 19:45:40 qbix79 Exp $ */
/* $Id: timer.cpp,v 1.42 2007-01-13 09:57:25 qbix79 Exp $ */
#include <math.h>
#include "dosbox.h"
@ -66,8 +66,9 @@ static bool latched_timerstatus_locked;
static void PIT0_Event(Bitu /*val*/) {
PIC_ActivateIRQ(0);
if (pit[0].mode != 0) {
pit[0].start = PIC_FullIndex()-pit[0].delay; // resynchronize
PIC_AddEvent(PIT0_Event,pit[0].delay);
pit[0].start += pit[0].delay;
double error = pit[0].start - PIC_FullIndex();
PIC_AddEvent(PIT0_Event,pit[0].delay + error);
}
}
@ -112,6 +113,7 @@ static void status_latch(Bitu counter) {
else if(p->read_state==1) latched_timerstatus|=0x10;
else if(p->read_state==2) latched_timerstatus|=0x20;
if(counter_output(counter)) latched_timerstatus|=0x80;
if(p->new_mode) latched_timerstatus|=0x40;
// The first thing that is being read from this counter now is the
// counter status.
p->counterstatus_set=true;