The Sinclair QL Forum

I was also considering to write a SER driver independent from SMSQ/E, partially based on my experiences with a Qx0 PAR driver long ago. Probably I'd have looked at your own SER driver, which was for a specific UART, if I remember correctly. It is unlikely that I'll have time for that in the coming m...

Where would I get this Qubide-derived BDI driver to test with? Ive been using the driver in the QLSD starter pack from dilwyn's site. That is the right place. You should also get the sources and the BDI specification there. For native driver development it was acctually quite helpful to have a defi...

Thread resurrection, but I guess there will not be an official release of uQLx with this in before my beard reaches my knees. One caveat: the new QL-SD drivers don't support the BDI format anymore, it is all QLWA now. The BDI interface has nothing to do with the filesystem used inside the image. It...

I've done a quick peek into the serial controller which uses the L2 interrupt but doesn't set the external interrupt bit in the interrupt register, hence you can't use the external interrupt list but have to modify the L2 interrupt vector to put your own code in front of it to get serial I/O workin...

What equivalent PNP bi-polar high-speed switching transistor is suitable instead of a ZTX-510? I'm a noob looking at datasheets and none of the PNP transistors I can find are quite the same. ZTX-510 seems to be a tricky one to find. It is not necessary to use a bipolar transistor. If I had to desig...

does the mini backplane flip the top board that comes out from the QL - I know it flips the board that would be entirely within the case? Maybe Dave or Derek can answer this. From the routing issues involved, I think it's likely that the outer board is not flipped by the mini backplane. Which makes...

It is available in a PLCC package which makes it easier to accommodate on a smaller board - it was used in the Atari ST machines so there is a fair bit of old stock around. That sounds better than DIL and would allow a solution without PLD - probably an advantage for tinkerers. The driver changes t...

The MC68901 sounds like a nice idea, since a good UART is also needed for the QL. But how about the large 48 pin DIL case and the fact that it is obsolete?

Same with QPC, that hasn't ever stopped you from bashing its closed-sourceness. No, I didn't even mention QPC and don't care if it is closed or not. I appologize, must have been a different Peter who always post things like As a free emulator my recommendation would be SMSQmulator. Unlike QPC and Q...

Many thanks Martin! Apparently I underestimated how useful the Q68 high resolution timer is... It's surely possible to do without the 2 ms for initialization and autonegotiation, so the accuracy of PING looks like the only severe issue when a 20 ms / 50 Hz timer is used. But removing the Q68 timer d...