Tool for helping find and verify IO ports in DOS.

Could be used just after having learnt a bit about on port IO.

Start port-io.exe.
Press f to find input ports.

Range to look for Port start -> Port end.

Port scanning in progress.

Scanned input ports (not perfect).

Press r to read from port.

Port number to read (96 is keyboard port).
Length of text to input is the number of reads to make.

Key w was pressed and released (effect can be seen).

Press w to write to port.

Port number to write to (97 here).
Text to be sent is the data.
Number of times to send the data.

Data is sent to port 97.