The Sinclair QL Forum

Hi Martin, many thanks for the good work. One correction to the manual: Pullups of 2.2 K or larger to 5V are allowed.

Hi Martin,

excellent job! The rise time on the SDA line comes from the 10 K Pullup on the Q68 which is typical for 100 kHz standard mode. It is possible to add smaller values like 2.2 K externally if 400 kHz fast mode is desired.

All the best
Peter

My hope would be, that maybe some European keyboards are closer to the German one in this regard than the British. But that is just hoping. Could be that a few keys still need special treatment. By the way, QLbase and Stephans stand-alone circuit are almost identical. The only difference is an addit...

The new QL baseboard with Qzero, two microdrive replacements with SD cards and QL speaker mounted in the QL case.

I was thinking more along the lines of the power and SD lights on the Q68 motherboard. I was wondering if soldering the QL LEDs over the Q68 ones would work. Ah now I understand. :) I would just desolder the Q68 LEDs and replace them by the QL ones. That is uncritical and delivers the full current ...

Hi Stephan, many thanks for the update. I have successfully tested it with my new QL baseboard also. Appears to work fine under SMSQ/E and Minerva. Just no autorepeat under QDOS Classic. Most likely due to leaving the autorepeat function to the OS itself. This is a minor issue. Great job! Thanks for...

This thread has way too long... Yes the new QL baseboard supports the QL LEDs and their original 6 pin connector (at least the one I have here in my German QL). The first one is meant as power LED, but actually driven by the Arduino which handles the matrix keyboard. It might end up as Capslock LED ...

lostcarpark wrote:I haven't done anything with LEDs yet. I'm wondering if the Q68 could be made to drive them.

I'm afraid the answer ist no, as the Q68 PS/2 controller for keyboard is unidirectional. Sorry for this, but I never look at the Capslock LED and simplified the logic somewhat.

Thanks, I'm aware of this chip and other external solutions. I didn't want to complicate the design, there is more than enough work already.
New PS/2 combo devices are still available, USB is low priority for me.

Only SER1 is supported But Mouse is available via PS/2? USB-PS/2 combo to be precise, here: qlbase_qlcase_back.jpg I did play with USB host in FPGA a little, so maybe actual USB support will be possible as a logic update someday. And when I said "only SER1" I was just referring to the def...