Sinclair ZX81 Repair & Composite Mod

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This video covers the basic composite mod (later ULA revisions), and the awesome mod created by JoulesperCoulomb which adds the back porch signal correctly (issue 1 ULA), resulting in a nice bright clear display. I also added a heat sink to the ULA, and replaced the keyboard membrane. Quick look inside of the 16K RAM pack as well. Many thanks to JoulesperCoulomb for taking the time (yet again) to bring us a mod which significantly improves video output on a Sinclair computer.

JoulesperCoulomb    • ZX81 Video Conditioning  

#sinclair #zx81 #repair #mod #composite #joulespercoulomb