The Sinclair QL Forum

As mentioned earlier, could you kindly share Osci-Picture of the input pins of Raspberry board?
Means GP3, GP5 and GP7 towards ground.

Thanks!

Hi Ernesto,

thanks for the reply.
The red output looks good to me!
Could you measure the red channel with the adapter attached?
On time on the output of the QL and second time on the input of Raspberry board?

Thanks.

Stephan

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I decided to remove this post as I can not re-check the scope setting. I currently do not have access to the scope and the QL board.

Stephan

Hi Leon,

great next step! Thanks for sharing here. It is really fun to play around with your development.
Stephan

Hi all, during the build of a second QL-VGA converter I found a strange issue. After copying the code to the virtual USB drive the board worked as expected. But after de-powering and re-powering it seems the code has been vanished or the RP2040 failed to start. In fact another forum member reported ...

You may ask whether this guy can read out the PAL content. Probably not 100% exactly the same but it may help to understand.

https://www.nightfallcrew.com/?s=SPEM

Stephan

Hi Chris,

to find the short you may consider to apply current 100mA to 200mA with an adjustable power supply. Then just feel which chip gets hot.

Stephan

I met Carlo around 1992 / 1993 at a QL meeting in the Netherlands, and I recall that MDV support was not possible: (2) MICRODRIVE support The MicroDrive subroutines and matching Hook codes of the ZX Interface 1 Shadow ROM are fully emulated. Nonetheless, it is not (yet) possible to read ZX Spectrum ...

There are also emulators that (nearly) completely emulate the ZX Interface 1 with Microdrive and serial port emulation. There are really ZX Spectrum emulators for the QL that emulating the ZX Microdrive? In terms that you can put in a ZX Cartridge into the QL Microdrive and load from it? Can you po...