TRS-80 Model 3 / Model 4 repairs

Back in March 2017, I bought a TRS-80 Model 3 on eBay.

When I received it, I did some cursory testing. It would boot to the BASIC ROM (by holding down the Break key as you reset it).

But it wouldn’t boot from disk, either from the supplied TRS-80 boot disks, nor my Video Genie boot disks. It wasn’t immediately clear whether the fault was in the disks or the drive.

There was also some curious information about its identity.

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RetroMatic 2000 update 21: fixing and debugging

After drawing a (dotted) line under my entry for the Retro Challenge, I took a week off from the project to have a rest.

For the Challenge I was able to demonstrate pretty much everything, but it wasn’t very reliable, and bits were breaking and being repaired in between shots of my wrap-up video!

So time to revisit it, and get it up to scratch to be a usable product.

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