Advance Projects - AdvanceCAB portio DOS Utility Documentation

Documentation of the AdvanceCAB portio utility.

AdvanceCAB Hardware Port Input/Output For DOS

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

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

If a lpt ports (lpt1,lpt2,lpt3) or an 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 the address and all the values are in the hexadecimal format.

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

Set all the parallel port data bits:

portio lpt1 ff

Clear all the parallel port data bits:

portio lpt1 0

Set all bit on the port 80h

portio 80 ff

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

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