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INT 17h, 00h (0) Send One Byte to Printer
Sends one character to the specified parallel printer and returns the
current status of the printer.
On entry: AH 00h
AL Character to print
DX Parallel printer number (0 - LPT1, 1 - LPT2,
etc)
Returns: AH Printer status (see Service 02h)
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For the AT, XT-286, and PC Convertible, INT 15h, Service 90h (Device
Busy), is called when the printer is busy. This notifies the operating
system that a time-out loop is going to begin.
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