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// public domain TSR clock code. By Michelangelo Jones, 1:141/575 or
// 1:1/124. Very little support available; this is a quick hack, not
// an example of the best way to write a clock TSR! Use at own risk.
// Runs under TC++/BC++. Your mileage may vary.
#ifndef __HUGE__
#error "Must be compiled using HUGE model-- for now"
#endif
#include <dos.h>
extern unsigned _heaplen = 0;
extern unsigned _stklen = 512;
static char * screenbase =
(char *) MK_FP (0xb800, 0); // change for mono
static const long int * volatile ticks = // to 0xb000, 0
(long int * volatile) MK_FP (0, 0x046c);
int calls, lastsec, lastmin, lasthr;
const double tps = 18.20648; // found by experimentation!
void interrupt (*oldhandler)(void);
void displayclock (void)
{
char *moveinto = screenbase + 300;
char *initwith = " : : ";
// NOTE: This initializer only works because the attribute I want for the
// clock HAPPENS to be the same as the ASCII value for the SPACE char!
// Modify every alternate character if you want some other attribute.
while (*initwith)
*moveinto++ = *initwith++;
lastsec = -1;
lastmin = -1;
lasthr = -1;
calls = 20;
}
void interrupt clockproc(void)
{
static long seconds;
if (calls < 17)
calls++;
else
{
seconds = (long) ((double) *ticks / tps);
if (screenbase[301] != ' ') // if the attribute has changed,
displayclock(); // the screen scrolled, so update.
if (seconds % 60 != lastsec)
{
lastsec = seconds % 60;
calls = 0;
screenbase[314] = (char) (lastsec/10) + 48;
screenbase[316] = (char) (lastsec%10) + 48;
if ((! lastsec) || (lastmin < 0))
{
lastmin = (seconds % 3600) / 60;
screenbase[308] = (char) (lastmin/10) + 48;
screenbase[310] = (char) (lastmin%10) + 48;
if ((! lastmin) || (lasthr < 0))
{
lasthr = ((seconds % 86400L) / 3600L);
screenbase[302] = (char) (lasthr/10) + 48;
screenbase[304] = (char) (lasthr%10) + 48;
}
}
}
}
oldhandler ();
}
void main(void)
{
oldhandler = getvect (0x1c);
displayclock();
setvect (0x1c, clockproc);
keep (0, (_SS + (_SP/16) - _psp));
}
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