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Functions HI-TECH C KBHIT
From HI-TECH C for CP/M Fan WIKI(EN)
KBHIT
SYNOPSIS
#include <conio.h> int kbhit(void)
DESCRIPTION
This function returns 1 if a character has been pressed on the console keyboard, 0 otherwise. Normally the character would then be read via getch().
SEE ALSO
getch, getche