Sinclair ZX80 / ZX81 Forums

Just assembled a clone of TS1510 and 32K cartridge.

It was not me, the files were shared by @nama and mentioned in the other post there: https://www.sinclairzxworld.com/viewtop ... 3821#p3821 Thanks a lot.

Well, well! Another "dead cockroach" mod

Some time ago I did something similar but with SMD components. See below:

Good Lord! This really works! Good work and congratulation. I've been looking at Jarek's projekt for months and did not decided to built one. Well done!

https://www.sinclairzxworld.com/viewtop ... =70#p33801

and the project is going slowly, but correct PCB was built last year. Updated PCB design is in a very advanced stage and testing will start by the on of this month (I hope).

Hi, Let starts for the begining. The machine has the correct power brick voltage, 15 V. This is not correct. No load voltage of the ZX Spectrum PSU should be not higher than 14.5V, and full load voltage should not be lower than 7.5V. The proper spec for Plus PSU is the unregulated power supply rated...

@alcid34: I've looked very briefly on your schematic and A9 of AY-8-8910 is not connected anywhere. A9 must be kept low, otherwise the AY chip will ignore any address request. Any input designated as TEST should be left open (i.e. floating).

Have you connected A9 of AY-3-8910 to GND?

Any AY-3-891x can work with ZX Spectrum (sound wise). In my applications I use 8910s, their clones and 8912s without any issues, as log as chips are fine. There is something wrong in your connections. Any schematic would be helpful.

The list updated: 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 - 2 units for 3.00GBP each Jupier ACE's PCB with add-ons like 96KRAMpack, video buffer and Tw...