The Sinclair QL Forum

In the end, the key is to use the RES_128 command before booting the program. Launching it from 3.5 floppy is wonderfully quick.

Wow. Extremely helpful guidance. I'll be careful to make certain the replacement drive matches the precise form factor of the original. Should be fun....

After much diagnosis, I've determined that MDV2 on my original black box is a lost cause - faulty r/w head. I'd like to remove and replace the unit with a known working spare that I have on-hand. I have the service manual to provide some guidance. Am also hunting for any step-by-step or YouTube vide...

I just added a SGC to my QL and have found that Microdeal QL Flight Simulator won't run. When I load and try to run the simulator, the screen very slowly loads with graphic blocks, the MDV spins endlessly, and the program never gets to a launch screen. If I remove the SGC, the program runs great. Do...

Rich,

Thanks so much. You diagnosed the issue perfectly: I had the ribbon cable incorrectly attached to the FLP3 connector. Moved to the other connector and everything is working!

Tom

I just acquired a Miracle Systems SGC and companion dual 3.5 ED floppy drives. The SGC is working great (so it seems) but I'm having difficulty with the disk drives. Basically, the cables to/from drives and SGC is connected, looks clean (no breaks), and the disk drives are receiving the requisite 5V...

Solved this on my own by trying it out and holding my breath. Everything worked fine. So, QL/SCART adapter cable plugged into SCART/HDMI converter in turn connected via HDMI cable to LCD TV works greater using the same 8-pin DIN video out cable on both US and UK versions of the QL.

Does anyone know of a repository of free- or shareware routines for testing QL hardware: memory, storage device read/write, keyboard, video, sound, port speeds?

Hello, I have a U.K. QL that I've successfully hooked up to my NTSC 1080p TV using a QL-SCART cable and SCART-HDMI converter box from HK. I've been pondering using the same set of connections (not the boring AV RCA port) to connect my US QL to the hi-def TV's HDMI port. Here's the thing. I remember ...

Hello, I have an unmodified QL that I've dusted off and brought back to life. All is all expected MDV2 runs continuously when I issue a dir or format command (or any drive command for that matter). The old service manual suggests replacing the ZX551 transistor (TR6). Before I pull out the soldering ...