The Sinclair QL Forum

Update I removed all the memory ICs from the Medic board and cleaned the sockets with isoclene. I very lightly sanded the IC pins and reassembled at what I thought was 128K at a time. I tried the card after each 128K but Minerva didn't see anything or make any comment although it did see the i/face....

Hi,
How I wish I could do stuff like that!

Dave

Hi. Thanks Dilwyn. The disk i/face and Qep3 worked for years in the original setup which is JS ROM so I guess the ROM issue was fixed by then. But any suggestions are really welcome. Right. I'd missed that the 12v was AC. I'll recheck that. I did side to side shorts but not the adjacent. Should have...

Hi, I know more about OPDs than QLs. One of the later additions to the OPD was a RAMCAP. This was a bank of volatile RAM , I think 512k , backed up with a battery that plugged into a capsule socket on the OPD. This is where OPD software was held in ROM. It enabled the OPD to write to it and it was s...

Hi, As the disc i/face is now not working with 2 of the QLs and only with Minerva I thought I would look at that first. The board has multiple socketed chips and the memory is arranged in 2 distinct banks. The sockets for the memory chips are of two different patterns, one being of the turned pin ty...

So...... This is starting to annoy. Not getting anywhere really so I removed the home wired through connector from the backplane. Didn't help . Still checking track integrity with the meter and looks O.K. Back to square 1 as they say. I have 3 Ql's 1, Built into a box JS ( my daily use before ) 2. B...

Hi,
I've got a 512kb through expansion. I'll give that a try and report back

Dave

Hi, Short time after my post I gave it another try. The track on the backplane connecting ASL on the expansion connector has been cut. The, now isolated, pin in the socket for the peripheral board has been hard wired to the GND on the 78S05 voltage regulator. The board works. I do not remember doing...

Ha!
Further investigation shows that the track to ASL has definitely deliberately been cut. So there was some connection from the ASL to the 7805 in order to get the Medic card to work. No solder on the 7805 input so that leaves me with Ground or ( i guess ) 5v.
Dave

Hi, My rekindled interest in my QL is turning into a bit of a trial. ( Could be said to be normal for me, by someone!!) 20 yrs ago I had a pretty good setup. QL + the Medic i/face + built in to a box with 2x floppies + hard wired 'real' keyboard to modified membrane connectors+ battery backed clock....