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Vintage 1980s Sinclair ZX81 computer – psu, comp mod and 16K RAM Pack


Thanks for looking at our Sinclair ZX81 computer – Refurbished and retaining its 1980’s authenticity!  Issue 1 Board with a rare 8112 ULA and a genuine Sinclair 16k RAM Pack.

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Thanks for looking at our listing for this Sinclair ZX 81, Issue 1 Board with a rare 8112 ULA

In great condition for its year.

ZX81 and 16k RAM Pack-ACED_RDR-027-IMG_4558

Comes with a new membrane keyboard on the front and has been upgraded to work on new TV’s.

Selling it with a 16K RAM Pack.

In good working condition. 

Work done:

  • All electrolytic capacitors have been tested to make sure that the ZX-81 has a stable power supply.
  • The insides of the RF modulator have been swapped out for another custom PCB that gives the ZX-81 excellent composite video output and produces the needed back porch to allow the ZX81 to give a crystal clear picture on modern TV’s – and it uses the same socket as the RF modulator used to so that we don’t have to modify the case at all.
  • Replaced the Z80
  • Replaced the regulator

ZX81 and 16k RAM Pack-ACED_RDR-027-IMG_4557

Comes With:

  • Original Sinclair Power Supply Unit which has been recapped
  • Polys and cover (both showing signs of age, see pictures)
  • ZX81 Basic manual
  • Original Sinclair 16k RAM pack with polys and cover

Ideal For A Vintage Computer Collector Or Sinclair Enthusiast.

If you have any questions then please let us know.

The little man even has new rubber feet to replace the old stinky shoes he used to have!

If you have any questions about this Sinclair ZX81 computer or any of the other computers or modifications on our site then please do not hesitate to contact us.

Additional information

Weight 3 kg
Dimensions 45 × 35 × 16 cm

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