Thanks for looking at our Sinclair ZX81 computer – Refurbished and Upgraded to 32K RAM and HRG (Hi Res Graphics) Ready!
Condition is Seller refurbished.
We’ve performed the following work on this little beast:
VLA81 Replacement ULA fitted
Composite video mod with our own custom PCB that replaces the insides of the RF modulator with a PCB that allows you to connect a standard phono to phono lead to the AV input (composite) on your LCD TFT TV
DC-DC converter fitted to replace the ageing 7805 regulator. Consumes less power and provides more stable voltage allowing the ZX81 to run much cooler – even without the heatsink (removed)
32K RAM fitted on a custom PCB with HRG8 extension to give you 16K for BASIC and an extra 16K to run hires HRG8 games
All in all, this is a well upgraded, refurbished ZX-81 with a case which is very tidy.
The actual screen is crystal clear with no lines or patterns on the display.
Also available on eBay – http://ebay.us/MXrHyO?cmpnId=5338273189