B-36. Function Name: UDTIM

Purpose: Update the system clock
Call address: Call address: $FFEA (hex) 65514 (decimal)
Communication registers: Communication registers: None
Preparatory routines: Preparatory routines: None
Error returns: Error returns: None
Stack requirements: Stack requirements: 2
Registers affected: Registers affected: A, X

Description: This routine updates the system clock. Normally this routine is called by the normal KERNAL interrupt routine every 1/60th of a second. If the user program processes its own interrupts this routine must be called to update the time. In addition, the <STOP> key routine must be called, if the <STOP> key is to remain functional.

How to Use:

1. Call this routine.

EXAMPLE:

   JSR UDTIM