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Add syncing to real clock to interrupt 8 (disabled by default. DOSBOX_CLOCKSYNC)

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3182
This commit is contained in:
Peter Veenstra 2008-07-19 13:28:03 +00:00
parent 4dbecf269c
commit 3f010a728c
1 changed files with 32 additions and 3 deletions
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35
src/ints/bios.cpp
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@ -16,7 +16,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: bios.cpp,v 1.70 2007-12-06 17:44:18 qbix79 Exp $ */
/* $Id: bios.cpp,v 1.71 2008-07-19 13:28:03 qbix79 Exp $ */
#include "dosbox.h"
#include "mem.h"
@ -320,10 +320,38 @@ static Bitu INT11_Handler(void) {
reg_ax=mem_readw(BIOS_CONFIGURATION);
return CBRET_NONE;
}
/*
* Define the following define to 1 if you want dosbox to check
* the system time every 5 seconds and adjust 1/2 a second to sync them.
*/
#ifndef DOSBOX_CLOCKSYNC
#define DOSBOX_CLOCKSYNC 0
#endif
static Bitu INT8_Handler(void) {
/* Increase the bios tick counter */
mem_writed(BIOS_TIMER,mem_readd(BIOS_TIMER)+1);
Bit32u value = mem_readd(BIOS_TIMER) + 1;
#if DOSBOX_CLOCKSYNC
static bool check = false;
if((value %50)==0) {
if(((value %100)==0) && check) {
check = false;
time_t curtime;struct tm *loctime;
curtime = time (NULL);loctime = localtime (&curtime);
Bit32u ticksnu = (Bit32u)((loctime->tm_hour*3600+loctime->tm_min*60+loctime->tm_sec)*(float)PIT_TICK_RATE/65536.0);
Bit32s bios = value;Bit32s tn = ticksnu;
Bit32s diff = tn - bios;
if(diff>0) {
if(diff < 18) { diff = 0; } else diff = 9;
} else {
if(diff > -18) { diff = 0; } else diff = -9;
}
value += diff;
} else if((value%100)==50) check = true;
}
#endif
mem_writed(BIOS_TIMER,value);
/* decrease floppy motor timer */
Bit8u val = mem_readb(BIOS_DISK_MOTOR_TIMEOUT);
if (val) mem_writeb(BIOS_DISK_MOTOR_TIMEOUT,val-1);
@ -331,6 +359,7 @@ static Bitu INT8_Handler(void) {
mem_writeb(BIOS_DRIVE_RUNNING,mem_readb(BIOS_DRIVE_RUNNING) & 0xF0);
return CBRET_NONE;
};
#undef DOSBOX_CLOCKSYNC
static Bitu INT1C_Handler(void) {
return CBRET_NONE;