Just stumbled across this site. I was one of hardware/firmware designers for this product. I may still have some manuals for the system, if there is any interest in me scanning them.
I designed the DRAM system (48K), the dot-matrix printer microcontroller hardware/ firmware, the RS232 terminal interface.
Also involved in a CPM conversion project that we never brought to market. Still know many of the team (Mike Varanka, Gary Cook, Roland Guilmet, Dennis Chasse, Dave. As well as the next generation (8088/86 based) system which we prototyped and didn''t make to market.
OS was called AMOS (Athena Multitasking Operating System) and used a bus based system that when each board was installed automatically provided relevant driver for the OS. No external software needed.
Interesting side note: Met Bill Gates of Microsoft, when we contracted Microsoft for Assembler, Basic, and Fortran software packages for the system.