The Sinclair QL Forum

Even if Peter says there isn't, here is a working example of how you can make the second screen usable in QDOS machine code programs. I didn't say there isn't. Just that I can not remember - which is a difference over 50 ;) I wonder how much room your procedure would leave for the actual code and d...

Saving the screen area somewhere else and restoring it before re-enabling interrupt and going back to user mode also works. Which means 96 KB of 128 KB used for the dual screens and the save area. And further memory also needs to stay untouched. Depending on the mass storage used, this may shrink u...

I want to do some experiments with graphics, and for that, the OS is not a concern. Naive question, but if it is just experimental, why not use Minerva? As far as I know, Minerva ROM adaptors are still available for the QL. And on the newer machines like Q68, which also support the second screen, M...

There is a QDOS Management Trap: MT.INF that returns the location of of the System Variables. Maybe just calling this Trap will solve the problem. Unfortunately not. It is perfectly allowed for the OS to place the system variables at a different location, and Minerva does that in order to allow the...

So, a hat's off Peter, this is the best QL hardware idea I have seen in a really long time! Many thanks Nasta. It is debatable whether a card for the expansion slot would have been a better idea. Doing it in an unorthodox way was more fun though. I never thought of doing it the 'other way' but did ...

Do you have also added the clamp diode option to all the pins ? Yes, that is mandatory of course. I guess there 'll be no problem using resistors for the reliability in the long run because they are quite big and the longer rise time doesn't affect the speed, for the speed to the QL bus is not high...

I have a question: could some way be implemented to get the video output of the QL through the video port of the QIMSI Gold? I did in fact implement this for Gold Card and Super Gold Card as a fun project. Requiring one extra wire. Probably I could also do it for 68008 QLs with two extra wires. But...

Peter you make me crazy. :shock: I 'm still enjoying the QIMSI base board and you already are peparing an astonishing new super upgrade. Well done. Keep me in mind for a future list of buyers. Interested for sure. Hi Marco, many thanks! I'm glad you are not angry with me, bringing the next interfac...

Ok I understand better how everything works. Not the answer I would have hope but I will find another QL to use with my QIMSI Gold when it arrives eventually. I was hoping the support code to drive the keyboard and such was provided at address 0, so the 68008 would boot using the special code. Tech...

Hi, I rarely use QLiberated software, because it does not allow copyback cache on 68040 and 68060, totally crippling those CPUs. Or even worse, some even require serialized cache mode, which makes high end machines like the Q60 insanely slow. But some QLiberated pieces are really nice, so I'd like t...