These HP weren't bad at their times... but today they may need more troubleshooting than computers you want to troubleshoot with them. They use Dallas battery backed up NVRAM modules to store calibration data. Today batteries are good past EOL date, and are non-replaceable. So I'd suggest going into...

So it looks more like a problem with RAM, not the floppy... have you tried to run YAART?

If you are using a Flash Floppy, then download an image manager supplied with the firmware version together with a right config files. You need to put these files on the root of your flash drive: ff.cfg img.cfg HXCSDFE.CFG AUTOBOOT.HFE You will find all these files in the archive with Flash Floppy f...

I've never seen a ZX Spectrum with a blue keyboard panel, why did you choose it ... if you want a better keyboard, why didn't you buy ZX Spectrum+ or TIMEX TC2048? This original ZX Spectrum is famous for its rubber keyboard and I think it should stay that way. Especially if it is about to be a colle...

Yes, the DS0..3 switch is where @czietz showed.

I have two of these:

But don't like them, as they read only 82 tracks.

Both ST and STf/e keyboard schematics for comparison: https://obrazki.elektroda.pl/9164169800_1578827160_thumb.jpg https://obrazki.elektroda.pl/9070325100_1578827159_thumb.jpg All ST keyboards were electrically the same (from the ST side), only the ST keyboard had re-routed JOY0/1 signals to the mot...

The bottom metal bracket is not a part of the drive, possibly under it there are solder-jumpers.

This is a quite common late ST FDD SONY MP-F11W.

This affects only the programming algorithm. When reading they all behave like regular ROMs.

I can't see your pics, and don't quite get what your problem is. My US (from different vendor), used to clear the card in slot #0 when I was powering off the Atari. The partial solution was to configure cards to be ACSI ID 1 and 2 instead of 0 and 1, but final solution was replacing an ACSI buffer c...

In most cases you can also use much cheaper Flash memories like 29C010.