The Sinclair QL Forum

Hi, and HAPPY NEW YEAR! Just for information there is PCB diagram ( both sides ) and schematics for the OPD disk interface from Computer 1 on the RWAP website. It's about as simple as they get and might give basic understanding of how it's all arranged. https://www.rwapsoftware.co.uk/oneperdesk/C1%2...

Hi Thanks to Silvester for the help with the ICs More tests continue to give conflicting RAM chip failures so I have ordered some IC21 ( HCT version) to replace. There are 2 of these on each OPD but I'd need to desolder them from the board. I have ordered from Tandy Online as, (for 5) they were 25p ...

Backplane alters nothing. Just carries each line through.

Just the Medic disk interface with 512k Memory and the QEPIII.

Ha! I've dragged out another QL. My last backup and standard JM but fully working and Minerva finds no memory problems. Right back at the beginning I mentioned that one track on the backplane had been cut and connected to GND on the 5v regulator. I can see that it was my work but I had no recollecti...

Hi, Away but not idle. I rebuilt my backplane having decided that the connector at the QL end was distorted and slack. Possibly enough to get random connections. Having rebuilt it and tested all the soldering I'm still getting erratic results. I'm trying to use my Medic disk i/face together with my ...

I was a founder member of Peter Rowells group and we started in Lolworth. I'm pretty sure the picture was taken in Lolworth Village Hall. A very busy group at one time. We were also at Coton for a while. PCs were moving in by then. Numbers declined eventually until we were meeting at Peters house in...

Hi, I have now read the MEDIC rom and it is a 2764. Obvious words in text are Medic Disk Upgrade v1.18 FILES STILL OPEN READ/WRITE FAILED FLP_USE FLP_SEC FLP_TRACK FLP_START PAR_USE RAM_USE MDV0 , SER, PAR, OEMS, HDRD,RTD, RAM0,QL5A, Possibly one or two others. Is there something I should be looking...

Hi,

Tel me where to look and I'll do my best. I might have a copy of the ROM to look at. Would that help?
Dave

Guess wot!

Used a block of wood