Multiuser turbodos which ran cp/m programs. Each s100 bus board drove a single Televideo 910 terminal over serial line. Single 20mb Minnie Winnie hard disk that everyone shares.

Ran wordstar, multiplan, and dbase, as well as a variety of language compilers. My simple favorite was pilot.

Multiplan had linked spreadsheets 10 years before lotus 123.

https://en.m.wikipedia.org/wiki/PILOT