Our custom ZX81 RAM upgrade board can be installed into your ZX81 computer internally to give your ZX81 32K RAM. It also has a jumper onboard that will let you enable or disable HRG8 compatibility (the ability to use HRG8 compatible high resolution games).
If you are competent with soldering, you can perform this upgrade yourself in about 30 minutes. We provide full fitting instructions by email that should be easy to follow by anyone with some level of electronics and soldering knowledge. You will need the ability to de-solder the RAM chip(s) already installed inside your ZX81 and fit this upgrade board.
If you would rather take the hassle out of installing the ZX81 32K RAM upgrade board, we can upgrade it for you if you send your ZX81 to us for an additional fee (see the options above).
Say goodbye to RAM pack wobble for good and gain the ability to run 16K software and hires HRG8 software the easy way!
You can also pair this upgrade with our custom Composite Video and Back-porch PCB to make your ZX81 ready for new televisions – see more information here Sinclair ZX81 Composite Video / Back Porch Generator Mod – Rude Dog Retros
if you have any questions about this, please email us at firstname.lastname@example.org