A nice blue copper sulfide coating on the traces, via, power button. https://media.infosec.exchange/infosec.exchange/media_attachments/files/111/378/772/889/769/049/original/ff448b76fd8894ab.jpeg
There’s a reason why this TI-92 was $10 on eBay. Take the batteries out of your unused electronics people. Now I have spare parts for the functional TI-92 that arrives tomorrow at least. #electronics #texasinstruments #retrocomputing