Mega Code Archive
A TSR CLOCK
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#include "dos.h"
void interrupt ( *prevtimer )( ) ;
void interrupt mytimer( ) ;
int running = 0 ;
unsigned long far *time = ( unsigned long far * ) 0x46C ;
char far *scr ;
char far *mode ;
main( )
{
/* peek into location 0:410h and determine video mode */
if ( ( *mode & 0x30 ) == 0x30 )
scr = ( char far * ) 0xB0000000 ;
else
scr = ( char far * ) 0xB8000000 ;
prevtimer = getvect ( 8 ) ;
setvect ( 8, mytimer ) ;
keep ( 0, 1000 ) ;
}
void interrupt mytimer( )
{
unsigned char hours, sec, min ;
if ( running == 0 )
{
running = 1;
hours = ( *time / 65520 ) ;
min = ( *time - hours * 65520 ) / 1092 ;
sec = ( *time - hours * 65520 - min * 1092 ) * 10 / 182 ;
if ( sec >= 60 )
{
sec -= 60 ;
min++ ;
if ( min == 60 )
{
min = 0 ;
hours++ ;
if ( hours == 24 )
hours = 0 ;
}
}
/* display digital clock */
writechar ( 48 + hours / 10, 0, 72, 112 ) ;
writechar ( 48 + hours % 10, 0, 73, 112 ) ;
writechar ( ':', 0, 74, 112 ) ;
writechar ( 48 + min / 10, 0, 75, 112 ) ;
writechar ( 48 + min % 10, 0, 76, 112 ) ;
writechar ( ':', 0, 77, 112 ) ;
writechar ( 48 + sec / 10, 0, 78, 112 ) ;
writechar ( 48 + sec % 10, 0, 79, 112 ) ;
running = 0 ;
}
( *prevtimer )( ) ;
}
writechar ( char ch, int row, int col, int attr )
{
*( scr + row * 160 + col * 2 ) = ch ;
*( scr + row * 160 + col * 2 + 1 ) = attr ;
}
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