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I thought the TRS-80 line was 6809 and 8085. Are one of those a cousin to the Z-80, or were there TRS-80's with a real Z-80 in them?

Tandy used the "TRS-80" name for many of their computer lines, even when they used completely different architectures.

The original TRS-80 ("Model I"), the TRS-80 Model III, and the TRS-80 Model 4 all used a Z80. https://en.wikipedia.org/wiki/TRS-80

Oh, right. I forgot about the I through 4. I'm not sure why, since the Model 4 was the first machine I ever played Zork on. Such a great beast.