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![🇬🇧🇺🇸 US Sinclair ZX81: Part 1 (First Upgrades) [#TCE0705] Guide](https://i.ytimg.com/vi/ETuSIYbKe40/mqdefault.jpg)
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ZX81 2022 Upgrades
ZX81 Composite Video Mod and internal Ram 16k Upgrade Part 1
Sinclair ZX81 Composite Mod : Part 1
ZX81 Upgrades
Building a ZX81 with all new parts in 2022 | Part 1 | #sinclair
Sinclair ZX81 Upgrades. Composite mod, 16K Internal RAM. Part 1
Upgrade Your ZX81: Step-by-Step Composite Video Mod Tutorial
An easy way to write machine code programs for the ZX81 - tutorial
![ZX81/TS100 From Old to New: Part 1 (Intro & regulator replacement) [TCE #0081]](https://i.ytimg.com/vi/Sl-FtwpyKEk/mqdefault.jpg)
ZX81/TS100 From Old to New: Part 1 (Intro & regulator replacement) [TCE #0081]
ZX81 / Timex Sinclair 1000 - Repair-A-Thon Part 1
A very unique zx81 computer needed some TLC
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Last Updated: August 19, 2026
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