I could have worded that better; I had Europe more in mind for Tandy and Apple's absence. I am aware that Tandy and Commodore had significant presence in Canada; Radio Shack stores were almost as much a presence in small towns there as in the US, and the PET began a long tradition of Commodore computers being more popular outside the US than at home. (Commodore even began as a Canadian company, back in its office-furniture days.)

(I know the article we're discussing here mentions a Tandy store in Europe, and TRS-80 was actually among the very earliest microcomputers of any kind available in Britain, but it disappeared almost immediately from the market for whatever reason. As for Apple, again, despite the Apple II Europlus, the Cork Apple factory, and Douglas Adams and Stephen Fry being the first two Mac owners in the UK, Apple was almost completely absent from the market compared to other US companies until the 1990s.)

>Also, the Model 1 was a Z80 and the CoCos were 6809s, which I suspect had much more to do with the differences in third-party software offerings than Tandy's 'attempts' at obfuscation, given the competition all had 6502/6510 processors that were much easier to port between.

6809 definitely contributed, but that still does not change Tandy going out of its way to discourage third-party products sold outside its stores. As for Z80, not at all. Tandy could have 100% dominated the CP/M market from the get-go had the TRS-80 been out-of-the-box compatible, but instead it foisted TRSDOS onto its users, so incompetently written that Tandy eventually gave up and licensed one of the many third-party replacement OSes it spawned as the official TRSDOS 6.