The Sinclair QL Forum

Thanks that is really helpful. I think the Bus Access State Engine is locking up in my PiStorm for some reason, so it's not asserting DS, hence no bus activity.

Ah yes, the buffering, that makes sense. However, I was expecting at least DTACK to have some activity because I read somewhere the QL
Video circuit holds the bus by keeping DTACK low during an access...
I suppose the whole circuit could be messed up by not having any pull ups in place of the 68K8 ...

Can anyone out there think of a reason why if I remove the 68008 from the QL there appears to be no bus activity... I would have expected there to be video accessing RAM and DRAM refresh activity, but for some reason I don't see anything apart from the clock...

Thanks Peter - I'll look into it. Is it on github?

Progress today - I have soldered all the bits on and modified the PiStorm Source code ps_protocol.c so that it only does 8 bit reads and writes... First I need to rewrite the test program buptest.c so that it reads and writes to the QL memory and perhaps writes something onto the screen. This will ...

Oh yes. that's just there as U7B is a subunit, it will be used in future when I make a PiStorm for my Amiga 4000 with a 32 bit address bus. Phew! I was worried I had done a major gaff.

Hi all, I decided to follow Peter's advice and not bother with making a 68000 board for the QL, I went straight for a PiStorm in the expansion socket, once it's working I'll do a CPU Socket version.

I am trying to make the minimum of changes to the PiStorm source code to make it 8 bit and to the ...

Peter, that was my first thoughts on how to do this as it would only involve re-laying out the piStorm PCB with one less latch, a couple of signals changed eg A0, DS, instead of UDS, LDS in the CPLD and changing the gpio.c file of the PiStorm source code to do the transfers 8 bit - but testing this ...

Hi all

I really want a PiStorm for my QL and the way I'm doing it is to build an expansion card with a full socketed 68000 (15MHz).
This will poke out of the end of the QL to give me access to all the signals and the CPU socket.
I am using 2 GALS, a 22V10 to do the interfacing to the 8 bit QL bus ...

Hi - where can I obtain one of these QIMSI Gold things from? I've searched everywhere...