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Allow DOS time to be temporary reset. Fixes romantic blue and others (QuickBasic games). Thanks ripsaw.

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3679
This commit is contained in:
Peter Veenstra 2011-02-24 15:08:05 +00:00
parent e31e0316aa
commit 4345813b10
1 changed files with 8 additions and 2 deletions
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10
src/dos/dos.cpp
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@ -86,6 +86,8 @@ static Bitu DOS_21Handler(void) {
char name1[DOSNAMEBUF+2+DOS_NAMELENGTH_ASCII];
char name2[DOSNAMEBUF+2+DOS_NAMELENGTH_ASCII];
static Bitu time_start = 0; //For emulating temporary time changes.
switch (reg_ah) {
case 0x00: /* Terminate Program */
@ -394,7 +396,7 @@ static Bitu DOS_21Handler(void) {
//TODO Get time through bios calls date is fixed
{
/* Calculate how many miliseconds have passed */
Bitu ticks=5*mem_readd(BIOS_TIMER);
Bitu ticks=5*(mem_readd(BIOS_TIMER) - time_start);
ticks = ((ticks / 59659u) << 16) + ((ticks % 59659u) << 16) / 59659u;
Bitu seconds=(ticks/100);
reg_ch=(Bit8u)(seconds/3600);
@ -411,7 +413,11 @@ static Bitu DOS_21Handler(void) {
//Check input parameters nonetheless
if( reg_ch > 23 || reg_cl > 59 || reg_dh > 59 || reg_dl > 99 )
reg_al = 0xff;
else reg_al = 0;
else { //Allow time to be set to zero. Restore the orginal time for all other parameters. (QuickBasic)
if (reg_cx == 0 && reg_dx == 0) {time_start = mem_readd(BIOS_TIMER);LOG_MSG("Warning: game messes with DOS time!");}
else time_start = 0;
reg_al = 0;
}
break;
case 0x2e: /* Set Verify flag */
dos.verify=(reg_al==1);