Documentation of the AdvanceCAB portio utility.

1 Synopsis

portio lpt?
portio ADDRESS_HEX
portio lpt? VALUE_HEX
portio ADDRESS_HEX VALUE_HEX

2 Description

The `portio` utility can be used to drive the parallel port or any other hardware device which uses the PC ports.

If an lpt port (lpt1,lpt2,lpt3) or a hexadecimal address is specified the port is read and the read value is printed on the screen.

If also a value is specified the port is written with the specified value.

All addresses and all values are in hexadecimal format.

The addresses of the lpt ports are detected using the BIOS information at the memory address 408h.

3 Examples

Set all the parallel port data bits:

portio lpt1 ff

Clear all the parallel port data bits:

portio lpt1 0

Set all bits on the port 80h:

portio 80 ff

Set all the parallel port data bits from config.sys:

device=c:\mame\portio.exe lpt1 ff