The Sinclair QL Forum

I replaced the other electrolytics on the m/b just in case. No difference. I've fixed it though, sort of. I carried out the same mod on my other CPU daughter board and that one worked first time - BASIC in ROM! I can only assume that something is flaky on the other board I was using... perhaps one o...

That is likely as I've noticed that resetting (removing and reinserting or shorting the 3v battery quickly) has had an effect in the past. Then the message 'Permanent store lost' appears on re-boot. I've removed everything from the CPU board and am comparing connections etc with the other working on...

I don't think just trying to read from that address would cause that problem - as the data is in ROM. I know, it must have just been a coincidence. It has crashed previously while working through the Welcome package menus but I put that down to dodgy loaded data and it worked from another copy of t...

Deary me, I don't know what I've done now. While attempting to sbytes 524,288 for a length of 32 bytes the OPD reset itself and now I no longer have BASIC in ROM :? Apart from that it boots as normal, it just keeps trying to access the mdvs to find BASIC. It was working so well up to now. The 5v rai...

You are no doubt correct, but I'll verify by sbytes-ing a few bytes starting at 524,288!

I'm planning on making a similar mod - but replacing both logic chips on the right hand (processor) side of the PCB, and doing the same trick - three x 64K blocks - and the remaining socket switchable for either 128K ROM or RAM at the address designated for RAM expansion - for RAM to work - the cod...

That would certainly help with the C1 floppy interface as that takes 7.5K RAM meaning that the configuration programs can't load as they need BASIC and there's not enough memory left. Yes, that was the thing that inspired me to find a way to be able to open them and also any other large-ish BASIC p...

In the darkest depths of the internet I found an OPD Teledrive disk image that I haven't been able to get to work on my OPD yet, but browsing through the content of the image with a hex editor I found a couple of docs/references relating to putting ICL BASIC in ROM - which in my opinion is a mini ga...

Apparently the PCML TeleDrive interface could read C1 disks but would corrupt them if they were written to by it. They are supposed to be PC compatible, i.e. FAT12 with a PC boot sector and with the same geometry as a PC 720K as formatted by MSDOS. The PCML you see is in the DOS manufacturer field ...

Isn't a .IMA file merely a raw image which you can dd or rawwrite onto a 720K floppy? Yes, but it looks to my untrained eye like the .ima file was not originally a C1 OPD floppy disk. The files contain 'PCML' so they must have been disks made with the other interface. And changing those 2 rows of P...