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Timex Sinclair 1000

TS1000 is the American version of the ZX81 and the first Timex Sinclair computer. It is 100% ZX81 compatible. In fact, early models had a ZX81 circuit board. Two 4x1K RAM chips replaced by single 8x2K RAM. It looks like a ZX81 except it has a Timex/Sinclair logo where the Sinclair logo appears on ZX81.
Timex have put 2K RAM instead of 1K.

sinclair-timex_comparison.jpg (8027 bytes)

Timex_ZX1000_System.jpg (8742 bytes)