unix for the Interdata model 70 ???

I recently picked up a nice Interdata model 70. Cool architecture, 16/32 bit instructions, fixed and floating point - the partial manual I have claimed IBM-360-like instructions. It's a microcoded machine with a "supervisor call" instruction but no memory managment or address extension beyond the 16 bit address bus. Does anyone have more info on these beasts - or what happened to them after Perkin Elmer bought Interdata? I've run a google search and came across many mentions of very early versions on unix being ported to the Interdata. Does anyone have an OS or heard of an early version of Unix for it? The machine seems to provide native hardware support for TTY paper and mag tape but I've seem no mention of disks....Unix without disks running on on 16Kb of 1 microsecond core could be very slow... Regards, Heinz Wolter