I'm trying to trace a type of system I did a little work on in my first job, which was for a company which no longer exists and I am not in regular touch with most of my former colleagues.
It was a desktop-minicomputer style system, with a system unit and dumb terminals on (I think) RS-232.
The main system unit was a big box, and had an integral CRT. I.e. the host machine had an integral terminal, or was even built into a terminal. This unit had an 8" floppy drive, vertically mounted to the right of the CRT. Behind the CRT in the (large, densely-packed) case was a hard disk drive of bigger than 8" platter size -- in fact the biggest I've ever seen in anything I actually worked on. 12" platters maybe? The capacity was quite small, I think 5MB to 20MB on bigger ones.
It supported multiple users on dumb terminals.
The system unit had a lot of boards in it -- I have a feeling the processor may not have been a single chip, but might have been distributed across several boards. We only had a few customers with them, and they were already very old machines when I worked on them in 1988-1989. Only one guy in the company really knew much about operating them, and he was also our main Alpha Micro engineer/programmer.
I am fairly sure these were not Alpha Micro machines, though, and the OS was nothing like AMOS.
Applications software was I think mainly bespoke, accountancy or maybe stock-tracking type functions.
The OS was called something like CP/M-83 or something -- I think it was CP/M followed by a number but it might have been CPM* (CP/M Star) or something. I have a vague feeling it was not punctuated in the normal CP-slash-M place.
The CLI was not even remotely CP/M or DOS-like. In my very minimal contact with things like IBM S/36 and AS/400, it was more like that: commands were short abbreviations, sometimes just a letter or two, with arguments that were often numeric. It was more like interacting with a machine-code monitor than any other shell I've used (quite a few: DEC VAX-VMS, DOS, Netware 2/3/4/5, etc.) It was not a DEC machine, either -- quite a lot of my early career involved VAX, Alpha and briefly PDP-11.
We also supported Jarogate Sprite systems, running Concurrent CP/M -- it was not them, but it was an older system that was used in similar roles. (E.g. multiuser accounts systems.)