Martin_Head wrote:By sod's law both routines have the same checksum! They both have the same number of bytes, and only differ by 2 bytes, and the two differences cancel each other out in the checksum.

Use a cryptographic hash instead, such as md5sum or even 3des?

Thanks! I'll look into it. With regard to your floppies, did you try soaking them in isopropyl alcohol? I've managed to recover quite a few that way. Sometimes the old lubricant just gets too sticky and the platter gets stuck. Sometimes it's the coating itself. Sometimes I can only read them when th...

The starting assembly programming thread inspired me last night to try to extract my code for the terminal emulator I wrote in 1988/89 from the development floppy. First I had to get an image and I managed to do this via macOS using 'dd' in a terminal. That was the easy bit. Finding a useful emulato...

A long time ago, in a galaxy far, far away... I started programming on the QL using the Computer One assembler/editor/monitor suite plus the "QL Advanced User Guide" from Adder Publishing. They were both fine for the job. I know that the C1 stuff has been preserved but I don't know where y...

they hit F2 for the TV.

I've just tested one of the metal box with white lettering units from eBay and it loses 4 characters from the right-side of the screen.

That's because the QL's output is outside the standard for 4:3 TV scan lines. This is why there was a special monitor sold to complement the machine.

Any thoughts about an internal version for the QL?

From the article it seems like it's still in development and testing, so no pricing.

I'd just seen that and was going to post about it. Looks very interesting.

Note: the 129K (or 126K) quoted seems to be a restriction of the ZX Interface 1 and not the device, so this is likely to be different on the QL.