This referred to any of Tandy Radio Shack's TRS-80 computers, first introduced in 1977 with the 4k (yes, 4k, not megabytes) TRS-80 Model I.
The term wasn't necessarily derisive; even those of us who owned and liked the poor things would refer to them this way.
The TRS-80 Model 16 could be purchased with a Xenix operating system. and many a business bought them for that purpose. Tandy DT-100 terminals still turn up now and then, and I worked on a running Model 16 as late as 1999. I also knew an accountant who was still running his TRS-80 Model I in 1996 - some people just don't like to upgrade.
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