[PC] [XT] [AT]
Expects: AH    01H
CX,DX desired tick-count setting
                                                                  
Returns: AH    0
CF    NC (0) if no error
CY (1) on invalid setting
                                                                  
Info: Sets the system clock top the specified tick-count.

Also clears the timer overflow flag at 0040:0070.

See Also: INT 1aH (BIOS Time I/O)
DOS fn 2cH (get system time)
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INT 1aH 01H: Set System Clock (Ticks)