The main thing to check whenever purchasing a second hand sinclair computer is whether it has been tested. If someone lists it and says that "it was working when put away years ago" you have to wonder why they have not bothered to test it before listing - is it because it doesn't work at all anymore, or maybe it is just the keyboard which no longer works.
If the keyboard no longer works, it is normally quite easy to replace a keyboard membrane on the Spectrum and Sinclair QL - replacement keyboard membranes for the ZX80 and ZX81 are nigh impossible to find, and even if you come across one, it is likely to be 20 years old.
Sinclair QL
Often, the seller will say "starts up to F1/F2 screen" - this is the boot screen. If they cannot get past this, you can bet your bottom dollar that it needs a new keyboard membrane (cost about 20 plus p
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