This Motorola Polyvalent Development System (PDS) gets a mention in this Microcomputers In Great Britain Low-Cost Laboratory-Computing 1978 research paper (along with SC/MP and other systems), as a low-cost version of the more famous Motorola EXORciser / Motorola EXORterm:
https://link.springer.com/content/pd...BF03205354.pdf
The EXORciser did interface to a separate EXORdisk 1-4 Floppy Disk unit / EXORtape Paper tape unit / ?? Cassette, operator terminal, a MACE 29/800 Emulator-pods system and a User System Evalulator (USE). Burr Brown made I/O modules that were compatible with the Motorola Micromodule Family Bus used in the EXORciser etc.
- The cards in it do look a bit like the S100 universal bus ones, that seem to be now getting more popular with retro/vintage computer people. although there were many similar sized ones back then. I've got a SWTPC 6800 'Minicomputer' that uses pin rather than edge connectors:
http://www.computinghistory.org.uk/d...39/SWTPC-6800/
I do recall seeing Motorola developments systems in one of their databooks / Application Manuals (1975?).- maybe the M6800 Support Products Brochure (May 1976?). I've had a look through all the 6800 Manuals / Books I've got, including an original printed-copy of the MEX68PP3 PROM Programmer-III (for EXORciser etc) User's Guide
- It seems software was on EDOS or MDOS disk, for EXORciser EXbug, but casssette / paper tape was used for other monitor ROM's / systems.
There's probably various Motorola 6800 ones on bitsavers / archive.org / here:
http://bitsavers.trailing-edge.com/c...nt_Systems.pdf (1979 version, but does briefly mention PDS etc)
http://www.exorciser.net/excorciser2_en.htm
http://www.exorciser.net/personal/ex...de/eugbrow.pdf
http://www.exorciser.net/personal
https://www.worthpoint.com/worthoped...uter-484170314