4116 D Ram tester with schematics and code

After several requests I finally got around to finish documenting an old project from the fall 2017. The ancient computer in our Solid State Logic SL4064G+ console uses a lot of 4116 D Ram which are known to go bad. Therefor I needed a way to check which IC is bad when I see a graphic error on the SSL computer screen. I looked around on the internet and found this post on a project designing a D ram tester for a different kind of D ram. Based on this design a made a version for the 4116 type D ram and reused most of the arduino code.

Please let me know if you find any errors in these attachements, thanks!

UPDATE: The initial schematic had errors in the inverting circuit for the -5vdc. Sorry. Below is a link to the corrected rev2 version:

Download the rev2 schematic here: 4116_tester_schematic

Download the arduino code here:  4116_tester_ulh.ino

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