INT 17H: Printer Support
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).
See Also: Parallel Printer Adapter Ports
INT 05H (print screen)
Printer Functions (DOS fns)
BIOS Data Area
Cables and Pin Outs