The Sinclair QL Forum

I'm struggling to find the 41612 connectors that are compatible with the QL and expansion cards

Most of the ones I find are listed as 64 pin but seem to have 96 holes (for the female) and males have the 64 pins spaced for 96 pins so I don't think they'll fit (at least that's how it looks to me ...

Sorry, took a while to respond. The Alea boards don't work with 3x 16k ROMS, see:
https://theqlforum.com/viewtopic.php?t=4177
I'm sure he'll modify the files so that they will work. If you have the boards already they can be altered.

I can confirm that the repro boards do fit inside an original ...

Thanks for the compliment Peter! Hope you enjoy it!

Using an 8 MHz clock oscillator saves one IC, two resistors and some space on the board...
It should be possible to also remove 4 diodes and make the whole thing faster with a few changes to the GAL programming, will look at the source...


Oh, that would be great. I can imagine the ATF16V8 could ...

Ok, here's what I got for now. I think this could be useable for you as well?
There is a jumper on the board with a track underneath that can be cut. For current measurement purposes.
I will order a few boards.

Nasta wrote: Sat Apr 05, 2025 7:33 pm BTW, is there a schematic diagram? Didn't see one in the github project...

There is a schematic on techfury's Github. It is not in PDF format, so Kicad needs to be installed.
Made a PDF that is attached below. My schematic is basically the same. Just the layout is different.

Cheers!

Have managed to find what I think are the correct connectors at RS

But the board I've found so far is 16cm long!


I got mine from: https://www.aliexpress.com/item/32808141634.html?spm=a2g0o.order_list.order_list_main.29.34951802hcx7jJ
Quite cheap, but they don't feel cheap. And they're doing ...

Moment of truth...!
It fits alright!


IMG_7734.jpeg


The only thing that bothers me is the green buck converter. Probably going to replace it with a black Traco or similar version.


IMG_7733.jpeg


And yes!!! It is working! No magic smoke... QL reports 896K of RAM and both floppy drives are ...

It is always worth resurrecting a QL ;-) Just finished my third and last QL with missing keys, pulverised membrane and crusty sockets.
Always fun to finally hear the whizzing sound of the microdrive spinning up!

I have a few populated boards of the QLpicoVGA left. You can see my version at the end ...

I have not actually tried a 1772, but I don't know why it wouldn't work, the only difference between 1770/1772 is the step rate/settle time tables, and the TC firmware is set up to work with either. I think the PCB is even marked "WD1770/1772"...

And yes, GAL16V8B or ATF16V8B will work equally ...