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Vložil: tomascz Vloženo: 08. 03. 2020, 17:01:12

My sincere apologies for responding with a delay!

Here is the layout of sockets from official manual for the Kompakt computer:

The DIN-5 socket:

In the remainder of this weekend, I will beep through my pins to find out how they are connected. Gee, I rolled up this cable before quarter a century!

As for reading/writing didaktik floppies - I will begin with the easier part, the writing. You can use virtually any tool which can dump 720k MS-DOS floppies as the logical structure of the disk is the same (just the content of the sectors is different). Back in 2014 I started to develop my own tool, later called the Real and Imaginary Disk Editor (or simply RIDE), https://github.com/tomas-nestorovic/RIDE. This tool attempts to juggle SamDisk (just a clever dump tool) with a file manager, so you can also directly manipulate the contents of the disk.

Right after its start, the application shows the welcome screen containing the manuals to the most common operations with the application, e.g. dumping an image to a real floppy.

Now to the trickier part, reading a real Kompakt floppy. I will make a long story short - they at Didaktik made two major mistakes when designing their MDOS operating system. The first is that they don't number floppy sides as 0 and 1, but 0 and 2, instead. RIDE can deal with this problem, other tools may not if they assume the correct numbering. The second and more limiting problem is that they put a too short gap before the first sector. Kompakt can deal with that but PCs can't. Sometimes, a PC floppy controller can catch the first sector but in most of the cases it misses it. There unfortunately no other way how to read such floppies on PC - not a single tool can handle them. Except for KryoFlux! But RIDE unfortunately doesn't support KryoFlux yet - I plan to incorporate the support towards the fall of this year.

To make things even more random, beginning with 1993, they at Didaktik started to fully support the IBM standard of floppy sector layout. So if your Kompakt announces the year 1992 at its start, it's already PC-compliant and its disks can be read without problem on a PC. If it announces the year 1991 or 1992, it isn't PC-compliant and the PC may fail to catch the first sector on each track.

As with writing, RIDE in its welcome screen offers a manual on reading a real floppy to an image (with extension *.D40 or *.D80). And as with ALL AVAILABLE TOOLS, your PC must be equipped with an INTERNAL floppy drive - no tool works with external USB floppies!

Hope this helps as a brief introduction to the Czechoslovakian Didaktik Kompakt

I'm now up to search for a voltmeter to beep through the wires in the above cable


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