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This video shows a repair of the Sinclair ZX81 retro computer.
0:00 Project introduction
0:27 Unboxing ZX81
1:26 Power adapter repair
3:48 Turning it on for the first time
4:35 Composite mod
6:59 Troubleshooting
8:18 Electrolytic capacitors replacement
9:01 Z80 test circuit
10:44 Desoldering ULA
11:53 Checking the ROM
15:32 Testing SRAM
17:01 Replacing the ULA chip
18:11 Testing the keyboard
18:20 Heatsinks on the ULA chip
18:30 Closing up the ZX81
18:49 Final words
RetroWizzard post:
/ 1515465522871209990
Mitchell Dayton post:
/ 1517136562290626560
ZX81 composite mods:
www.bytedelight.com/?page_id=...
www.evolutional.co.uk/post/zx...
github.com/gpimblott/ZX81-Com...
Z80 Test circuit:
www.z80.info/z80test0.htm
Ben Eater's clock circuit:
• Astable 555 timer - 8-...
ROM adapter:
www.hp9845.net/9845/tutorials...
Music used in this video is from Nihilore:
www.nihilore.com/