Any of you have an idea what this might be ?
The raw and preservation dumps can be found here in a zip file : https://gofile.io/d/6DJngC
1. The diskette format is not CPM or MSDOS!
2. There is a header at hex 0400 "BOASIS ARCHIVE Version 5.5 15-03-91 08:15:17" ....
3. There is a string at hex 0201 "ARCHIVE VOLUME01"
4. There is a copyright notice at hex 1658 "Copyright (C) 1989 by Radiateuren Groothandel bv" followed by the adress and telephone number of the company.
5. The ASCII excerpts show dutch language with typical business aspects.
So this disk was written in the early 1990ies most likely with a professional business PC equipped with a real-time clock and the floppy is the first one of an archive of several (640kB, 80 tracks, 16 sectors of 256 bytes) volumes.
Maybe this helps you to remember...
The use of quad density (80 track double density) and 256 byte sectors mostly rules out IBM PCs or IBM PC clones.
Is there any project going on that tries to identify all disk formats ? Perhaps some fingerprinting technique can be applied ? I am sure that a lot of people could supply "samples" (easy to think up things but harder to execute probably)
http://bitsavers.trailing-edge.com/bits ... eo/TS-804/
http://bitsavers.org/pdf/televideo/TS_8 ... an1984.pdf
The manual describes the ARCHIV command, with which the floppy was created:
https://archive.org/details/bitsavers_p ... 5_11607264
You'll even find the "BOASIS ARCHIV version" string on the system disks!
And with that and your info I found bitsavers has some images for that too : http://bitsavers.trailing-edge.com/bits ... ies_5/imd/
And double yes, that also has the BOASIS string
And triple yes, I have two Altos systems (and actually perhaps soon another two) but never run Oasis on it, just MPM (Multi-User CP/M)