Search found 29 matches
- Thu Dec 30, 2021 7:55 pm
- Forum: Hardware
- Topic: schematics for floppy disk interfaces
- Replies: 78
- Views: 39629
Re: schematics for floppy disk interfaces
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...
- Tue Oct 19, 2021 11:18 am
- Forum: Hardware
- Topic: Backplane and other problems
- Replies: 31
- Views: 8612
Re: Backplane and other problems
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 ...
- Fri Oct 15, 2021 7:45 pm
- Forum: Hardware
- Topic: Backplane and other problems
- Replies: 31
- Views: 8612
Re: Backplane and other problems
Backplane alters nothing. Just carries each line through.
- Fri Oct 15, 2021 7:44 pm
- Forum: Hardware
- Topic: Backplane and other problems
- Replies: 31
- Views: 8612
Re: Backplane and other problems
Just the Medic disk interface with 512k Memory and the QEPIII.
- Fri Oct 15, 2021 3:50 pm
- Forum: Hardware
- Topic: Backplane and other problems
- Replies: 31
- Views: 8612
Re: Backplane and other problems
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...
- Thu Oct 14, 2021 8:42 pm
- Forum: Hardware
- Topic: Backplane and other problems
- Replies: 31
- Views: 8612
Re: Backplane and other problems
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 ...
- Sun Oct 10, 2021 8:11 pm
- Forum: General QL Chat
- Topic: Fluffy Dice for your Sinclair QL
- Replies: 6
- Views: 2725
Re: Fluffy Dice for your Sinclair QL
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...
- Sun Sep 05, 2021 4:36 pm
- Forum: Hardware
- Topic: Backplane and other problems
- Replies: 31
- Views: 8612
Re: Backplane and other problems
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...
- Sun Aug 22, 2021 9:35 pm
- Forum: Hardware
- Topic: Backplane and other problems
- Replies: 31
- Views: 8612
Re: Backplane and other problems
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
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
- Sun Aug 22, 2021 5:37 pm
- Forum: Hardware
- Topic: Backplane and other problems
- Replies: 31
- Views: 8612
Re: Backplane and other problems
Guess wot!
Used a block of wood
Used a block of wood