The Sinclair QL Forum

chriskgnr wrote: Sun Mar 09, 2025 4:15 pm I am not sure, but i think the eprom ic on the kludge should be in the left ic socket.

I think you're right. Looking at the schematic, the #CE line of IC2 is enabled with both A14 and A15 being high. I.e. address 0xC000.

Oh, and thanks to Techy I now have two Kludge boards. I made the molds that I believe Alvaro designed.
First draw was sort of okay. Unfortunately I only have 0.5mm black HIPS for now, so these are a bit flimsy. I did a second draw with 1.0mm HIPS and these feel a lot better. I will try to do another ...

Hi Techy,

I'm not an expert, but I just had a look in the service manual and the issue 5 schematics. By the looks of it, if the 74LS00 is not installed both sockets are in parallel.
With the 74LS00 in place and the necessary links (!) you should be able to use two 16K internal EPROMs. Maybe CHR ...

Hi Wicksy,

Do you mean the schematics for an external ERPOM or a PCB for the internal ROMs?
Alvaro has the schematics and gerber files on his Github for an external EPROM board:
https://github.com/alvaroalea/QL_Rom_Cartridge

I was planning to order a few of the Kludge boards designed by Alvaro. Seems like he has done a neat job. Chr$, did you verify that the dimensions are close enough to the original?

I bought a vacuum former a while ago and I would like to make some casings as well. Unfortunately I don't have an ...

Gents,

I found a QXL card in my stash of old Sinclair machines. I got it somehow many years ago and never used it.
It says QXL 2B on the back and has 8 SIPPs installed. Those are TC514400 ones. Googled it and they are 1Mb x 4bit RAM.
The CPU says XC68EC040RC 25 B. Is that the 25 MHz version ...

Hi IIfx,

Welcome! I'm new to the QL scene as well. Mine have been tucked away for decades and it feels like I am starting all over again. Enjoy! You will love this machine.

Hi Dilwyn,

Thanks for all the links! Had a quick look and that's what I need to get started.
I don't have anything, not the manual nor the floppy disk. Unless they are in some of the boxes from the attic I still have to unpack...
I have to find an old PC with an ISA slot to get started first ...

I'm in the process of bringing my old QLs to life again. I got three of them and each has a different ROM. I've got a JM, a JS and an AH ROM in a ceramic package with a "golden" cover! One of them is an issue 6, the other two an issue 5.
So I thought the best thing to do was to upgrade all of them ...

Gents,

I found a QXL card in my stash of old Sinclair machines. I got it somehow many years ago and never used it.
It says QXL 2B on the back and has 8 SIPPs installed. Those are TC514400 ones. Googled it and they are 1Mb x 4bit RAM.
The CPU says XC68EC040RC 25 B. Is that the 25 MHz version ...