The back of the PCB in the case. It has red solder mask.

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   root42 (root42@chaos.social)'s status on Thursday, 19-Dec-2024 22:16:49 JST root42

   And there it is: the humble Sinclair ZX81. A 1KB, Z80 based machine from 1981. This particular one from 1982. It is in generally good condition, works, but keyboard is broken. The membrane is breaking to bits, as you can see. So a replacement membrane is on order. Also the image quality is terrible, this machine will get a composite mod.
   #sinclair #zx81 #retrocomputing