This repository contains the PCBA design files for a 16-bit TTL compatible I/O expander for the PiDP-11 and Raspberry Pi. Design files are intended to be viewed using Altium Designer. Releases may also be uploaded to the standalone Altium 365 Viewer for free.

Project documentation is hosted on Hackaday and assembled boards are available for purchase from Tindie.

A test fixture was created to support functional testing of PCBs. The fixture is based on a Merifix MF300 with a custom interposer controlled by a Total Phase Aardvark and a B&K Precision 1785B benchtop power supply. Functional tests were developed in Python using the OpenHTF hardware testing framework.

To execute functional tests, follow these steps:

1. Install the Chocolatey package manager for Windows.
2. Using Windows Explorer, navigate to the Python folder and right click on the setup.cmd command file and select Run as administrator. This will install dependencies and create a Python virtual environment for testing.
3. Double click on the fct_station.cmd command file in the Python folder to start the FCT test station.
4. You can interact with the test station from either the command window, or by pointing a browser to http://localhost:4444.
5. Enter the DUT serial number to begin testing using the keyboard or hand scanner (eg. Symbol LS2208).

For more details, see the latest release on GitHub.

Pull requests are welcome! See CONTRIBUTING.md for more details.

Source code in this repository is licensed under a Simplified BSD License. See LICENSE.txt for more details.