Sinclair ZX81
Specifications:
CPU: Z80 @ 3.25 MHz (or NEC µPD780C-1 equivalent)
Sound:None
Display: 64 by 48 black and white. Some very clever machine code was able to generate 256 × 192 by overriding the interrupt service routine.
Memory: 1K RAM (expandable)
Software Media:Cassette.
Value: £40 - £50. It may be old, but isn't as rare as you'd think.
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