Sinclair ZX80 / ZX81 Forums

An update: 96K RAMpack + AY bare PCB - 1 unit left for 5.00GBP 96K RAMpack + AY DIY kit including nearly all parts except 628126 IC and the edge connector - 1 set for 12.50GBP Video output buffer PCB - 3 units for 3.00GBP each Jupier ACE's PCB with add-ons like 96KRAMpack, video buffer and Twister b...

Impressive work! I would be interested in bare PCB if possible.

it looks interesting. BUT, have you considered adding 16K RAM on it, just in case. No much software can run on 1K Zeddy. Are AY ports the same like in the ZON or are they ZX Spectrum ones?

Hi David,

Replied to your PM.

Kind regards

“Remember, remember the Fifth of November, gunpowder, treason and plot”

Hi Mark,

Replied to your PM.

Cheers,

Hi All, I am clearing my draws and boxes. Some items and leftovers from my Jupiter ACE replica projects must go. Items for sale are as follows: 96K RAMpack + AY bare PCB - 2 units for 5.00GBP each 96K RAMpack + AY DIY kit including nearly all parts except 628126 IC and the edge connector - 1 set for...

To be honest I've made this mode with 1N4148 diodes and it works without any issues.

Regarding NAND gates logic, the circuit would be as shown below:

In your web browser change text encoding to "ISO Latin 1" and reload the page. It should work fine.

BTW I've modified a few ram pack with Wilf's trick and they show WRX1K graphics correctly.

6.5MHz crystals are available at Mouser and other good electronic retailers. Also 6.5MHz ceramic resonators are still in manufacturing and available. However I would go with a 13MHz unit or LTC1799 resonators.