Video sponsor: PCBWay: $5 for 2 layer PCBs with 24hr turnaround at https://pcbway.com/g/m3hn11

In this video we take a look at one of the original ‘big three’ computers. A TRS-80 Model I. It has a screw screen output consisting of garbage repeated 4 times. Let’s take a look at this classic piece of computing history and get it working like new once again.

Timeline:
00:00 – Welcome
00:52 – Symptoms and PCR
05:00 – Video Divider Chain
11:24 – Garbage screen cleaning
16:04 – Will Diag. ROM help?
24:38 – Keyboard testing
26:55 – Wrap up. Thanks!

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Links
Ira Goldklang’s site: https://www.trs-80.com/wordpress/welc...
Diagnostic ROM: https://github.com/misterblack1/trs80...

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Credits
Chiptune Thing No. 3 "Victory" by Steven O’Brien   / stevenobrien  
Creative Commons — Attribution 3.0 Unported— CC BY 3.0
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Music provided by Music for Creators    • Chiptune Thing No .3 Victory — Steven...