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)

                                                                          

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.

See also: INT 17h, 01h
See also: INT 17h, 02h

INT 17h, 00h (0) Send One Byte to Printer