Comment Re:"Custom OS" (Score 1) 277
I think what you're thinking of is the ICL PC Quattro - which didn't run DOS, it ran Concurrent CP/M 86. I used to have one, and yes it did allow each terminal to run four different login screens - the system unit also allowed you to connect up to 4 separate terminal units. Had a colossal 10MB hard drive too - sadly it took up a lot of space and ended up being unceremoniously scrapped (into landfill too - before the days of even attempted recycling!).
I still have the original system floppies along with an original copy of SuperCalc 2 - never tried reading the disks since then though.