These functions provide access to the parallel printer ports (LPT1, etc.)

The printer port addresses are stored starting at 0040:0008.  Printer
time-out intervals start at 0040:0078.  See BIOS Data Area.

AH  BIOS Service
00H print a character
01H setup printer port
02H query printer status

Note: The BIOS offers no support for bidirectional parallel
communications (though standard PC hardware has supported it
since about 1987).

INT 05H (print screen)
- -

INT 17H: Printer Support