TRS-80 8 MB Hard Drive Three Wire Fix

By | September 15, 2018

I recently needed to replace the SA1000 hard drive bubble in a Tandy Radio Shack TRS-80 8 MB Hard Disk Drive unit. While I was very familiar with how to do this in one of the later 5 MB or 12 MB hard drives, I had never attempted the procedure on the 8 MB drive. In the end, it was fairly straightforward to replace the bubble, except for dealing with the famous Tandy 3 Wire setup. The 3 Wire Fix has been documented in the past for the smaller 5 MB and later drives, but not for the 8 MB unit. I went ahead and put together that process here.

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