ZX81 repair
48:18
Sinclair ZX81 Repair Challenge - Can These 4 Classic Micro-Computers From the 80s Be Restored?
24:12
ZX Spectrum, Rom Cartridge Research
19:10
ZX81 still awesome after 40 years!
27:04
ZX81 ZXvid Upgrade
23:39
The BEST ZX Spectrum Diagnostic Cart You Can Buy!
9:27
As promised - The ZX81 lives! And that 32k upgrade got thrown in too!
15:21
How to install a ZX81 16K Ram expansion - 10 minute mod!
14:24