0:408h                   Parallel Printer Port Base Addresses

Length: 8 bytes

Base addresses for four parallel printer ports. If a port address is
0, then that port is not used.

0:408h - Parallel Printer Port #1 (LPT1)
0:40Ah - Parallel Printer Port #2 (LPT2)
0:40Ch - Parallel Printer Port #3 (LPT3)
0:40Eh - Parallel Printer Port #4 (LPT4)

See also: INT 17h, 01h

0:408h Parallel Printer Port Base Addresses