ZX81 Video Conditioning

ZX Spectrum Hardware Description

ZX81 repair

ZX Spectrum (48K & 16K) Initial Tests

Sinclair ZX81 (Timex 1000) Grandaddy of Computers | Nostalgia Nerd

48K ZX Spectrum Repair (No. 1)

Games That Push the Limits of the ZX81

Sinclair ZX81 Repair & Composite Mod

What's inside the ZX81 RAM Expansion?

ZX Spectrum +2 Repair (No. 4). Plus a look at methods of improving picture quality.

Replacing Electrolytic Capacitors in a ZX Spectrum

Sinclair ZX81 composite video modification

ZX-81 architecture overview and repair, mod and upgrade plan (Pimp My Eight, episode 4, part 1)

Philips PM 3214 Oscilloscope Repair. Part 2.

ZX81 - Is it worth fixing?

Documentary - The Sinclair ZX80, ZX81, and Timex Sinclair 1000

48K ZX Spectrum Repair. (No. 6)

ZX81 ZXvid Upgrade

ZX Spectrum +2 Repair. (No. 7). Part 2.

Restoring and Exploring a 1981 Sinclair ZX81