Purpose: Read system clock
Call address: $FFDE (hex) 65502 (decimal)
Communication registers: A, X, Y
Preparatory routines: None
Error returns: None
Stack requirements: 2
Registers affected: A, X, Y
Description: This routine is used to read the system clock. The clock's resolution is a 60th of a second. Three bytes are returned by the routine. The accumulator contains the least significant byte, the X index register contains the next byte, and the Y index register contains the most significant byte.
EXAMPLE:
JSR RDTIM STY TIME STX TIME+1 STA TIME+2 ... TIME *=*+3