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Correct calculation for function 0x2c get time.

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@868
This commit is contained in:
Sjoerd van der Berg 2003-04-04 21:59:38 +00:00
parent fe77e30d77
commit 54edb9922b
1 changed files with 5 additions and 3 deletions
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8
src/dos/dos.cpp
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@ -296,12 +296,14 @@ static Bitu DOS_21Handler(void) {
case 0x2c: /* Get System Time */
//TODO Get time through bios calls date is fixed
{
Bit32u ticks=mem_readd(BIOS_TIMER);
Bit32u seconds=(ticks*10)/182;
/* Calculate how many miliseconds have passed */
Bitu ticks=5*mem_readd(BIOS_TIMER);
ticks = ((ticks / 59659u) << 16) + ((ticks % 59659u) << 16) / 59659u;
Bitu seconds=(ticks/100);
reg_ch=(Bit8u)(seconds/3600);
reg_cl=(Bit8u)((seconds % 3600)/60);
reg_dh=(Bit8u)(seconds % 60);
reg_dl=(Bit8u)(((ticks * 10) % 182)*100)/182;
reg_dl=(Bit8u)(ticks % 100);
}
break;
case 0x2d: /* Set System Time */