You’re right. I got a “Timex Sinclair 1000” at a garage sale, it’s a 2KB modified ZX81. The other manufacturers you mention had more software available, and Commodore often played dirty.

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I’m tempted to replace the TS1000’s failing keyboard with one of those new ones with tact switches, but that’s a bit of an investment for what would sit on the shelf anyway. My C64 at least still gets played and demoscene stuff showed off!