This is the command to control Old Raspberry Pi Mega-IO Expansion Card
Before compiling you have to install Wiring Pi, many thanks to Gordon Henderson for the library.
Since the WiringPi are not longer maintained by his creator, to install it, get the latest .deb version from:
https://github.com/WiringPi/WiringPi/releases/
The -armhf.deb file should be used on 32-bit OS (Raspberry Pi 3 and under) and the -arm64.deb is meant for 64-bit OS (Raspberry Pi 4 and up). Download the appropriate file for your architecture on your Raspberry Pi and install it with the dpkg command:
dpkg -i wiringpi-[version]-armhf.deb
or
dpkg -i wiringpi-[version]-arm64.deb
Test that the WiringPi installation finished successfully with the command:
gpio -v
~$ git clone https://github.com/SequentMicrosystems/megaio-rpi.git
~$ cd megaio-rpi/
~/megaio-rpi$ sudo make install
Now you can access all the functions of the Mega-IO card through the "megaio" command. If you clone the repository, any update can be made with the following commands:
~$ cd megaio-rpi/
~/megaio-rpi$ git pull
~/megaio-rpi$ sudo make install
For python library install and usage checkout the "python" subfolder.