The Sinclair QL Forum

Anyone seen this before? (...) IC35 (7805) missing. IC37 (7812) missing. Big resistor goes from IC37 to L5 which has been lifted one end. Track cut on negative part of IC37 -> IC38. I was planning on replacing with a board which is a standard Issue 5. I've compared your board with my issue 5 Thor, ...

As Nasta loves telling me: The QL was not designed to be backfed power. Removal of the 7812 and 7805 prevents the release of the magic smoke when you have power at the output and nothing on the input. The Thor doesn't use the microdrives so there's no need to ensure power there. From my recollectio...

Anyone seen this before? https://s15.postimg.org/mzyhbo9wb/IMG_2425.jpg This is on my Thor which provides its power via the expansion connector. Unfortunately this board is now failing with pretty patterns and noise, but the ROMS are OK. IC35 (7805) missing. IC37 (7812) missing. Big resistor goes fr...

OK, best place to get my motherboard repaired? Does anyone have a fully functional issue 5 spare? I have 3 x Issue 5 motherboards - one has the JM ROM chips piggybacked, but I would need to test them all. None have microdrive units, but I guess that does not matter. £30 each plus postage :) Hi Rich...

@Derek, I did manage to quickly test the 3 Thor expansion boards, you sent me, before the QL motherboard went Pete Tong! The one that says DEAD is definitely that! Nothing at all. The other 2 boards booted and had similar issues to what I was seeing with mine although they did both register 640K wit...

OK looks like my QL motherboard has just gone down! :( It was booting OK as I put a Minerva ROM in to test and it was showing that only 128K was seen not the 640k as expected so there was some issue with memory. Was working with an external mdv and a keyboard membrane. Then it all stopped! Now all I...

I am using 8 track cassette felt from the US, fantastic results and low friction.

Does anyone know where there are a decent set of manuals for the Thor 8?

User manuals etc. in PDF format?

Thanks

Russ

Nice looking expansion!

I've no experience of the Thor. But looking at your photo's, It looks like a fairly standard QL motherboard. Could you extract it and test it separately. It would at least tell you if the problem is on the QL, or the THOR side. You say you get the checksum error after the CST Thor line. Which on yo...