A while back I made a video where I figured out how to run the built in ROM diags on a Mac SE/30 over its serial port. I documented the work and some smart folks have turned that work into an easy to use program that anyone can use:

www.youtube.com/watch?v=K48vtzdnXa8

Great resource to fix a bad Mac!

March 02, 2026 - 19:44 UTC

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This could be excellent timing for me! I just bought a broken SE/30 for €50. Haven't had a chance to look at it yet but the previous owner couldn't get it working after recapping it.
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Reverse engineering the Techstep was seriously impressive!
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My original video:
youtu.be/W1biFIdQZDw

And the information required to run the diags: (Manually)
docs.google.com/spreadsheets/d/1zsc7ET5fyiOYWj1_AzOgafbrCVFED-7jzLH6ruCiAVE/edit?usp=sharing
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