The Sinclair QL Forum

Hello, Follow the advice from Martin, I had a similar issue when I replace my CPU. Proved to be the logic circuitry so upload photos. Could be a bad soldering joint underneath the pcb. I’m not sure if you will get this behaviour with the jumper on the Minerva pcb wrong but make sure you have it set ...

Did it boot normally before you inserted Minerva? If so I would go back and test with original ROM.

Have you bought the Minerva or built your own?

Hi,

To be sure not to draw power from the batteries I have set the voltage to 7v.
If anyone planning to upgrade RAM/Flash then I recommend to follow the instruction where you don't have to cut any tracks.

/Chris

Hi

No real help but:
When you programmed the 27128 did you program in the correct bank ?
Are you using Minerva, don't know if they can co-exist

Hi,

Sorry I misunderstood your question, I have tried most of them and all of them need a ROM.
apart from Minerva RAM test I di nit know of any dedicated test ROM you can boot from.

Hi, You mean the one from Thorn?
Urs has them in his repository
https://www.sinclairql.net/downloads/TH ... s-SQPP.zip

Leon, what an achievement, really great!!

Hi,

I can really recommend these rollers, smoother, quieter plus it seems to be more stable readings!

Well Done J

Welcome to a great forum!

Hi

Leon, great work as always.

I haven't all the posts but could it be possible to use your PCB and design an adapter board with the socket for CPU and 8301 routed to a DIN41612, this instead of having to reroute the PCB?