RBIL61 - Printer Enhancements

MEM 0040h:0008h - BASE I/O ADDRESS OF FIRST PARALLEL I/O PORTIBM PC Portable (uses same BIOS as XT)
MEM 0040h:000Ah - BASE I/O ADDRESS OF SECOND PARALLEL I/O PORTIBM PC Portable (uses same BIOS as XT)
MEM 0040h:000Ch - BASE I/O ADDRESS OF THIRD PARALLEL I/O PORTIBM PC Portable (uses same BIOS as XT)
MEM 0040h:000Eh - BASE I/O ADDRESS OF FOURTH PARALLEL I/O PORTIBM PC Portable (uses same BIOS as XT) (pre-PS/2)