'INT 1A - TIME - GET SYSTEM TIME
'        AH = 00h
'Return: CX:DX = number of clock ticks since midnight
'        AL = midnight flag, nonzero if midnight passed since time last read
'Notes:  There are approximately 18.2 clock ticks per second,
'         or 1800B0h per 24 hours.
'
'Notes:  Clock ticks are actually at 18.20648 per second single-precision.
'
'Notes:  Clock ticks are extended at 18.206481481481 per second calculated.
