View Full Version : Microport UNIX System V Release 4

July 1st, 2010, 05:41 PM
I am interested in Microport's distributions of UNIX as clean,
full ports of historical System V for old personal computers
based on Intel processors (286/386).

I have seen the System V/AT distribution of System V Release 2
from circa 1986-87 around, but have not been able to determine
if Release 4 actually ever shipped from Microport after a long
period of googling and old computer journal research at the
library. The release 4 distribution would be particularly
interesting because other 386 variants appear to be either
incomplete implementations of Release 3 (Interactive UNIX, Xenix,
SCO Unix) or modified in Release 4.2 as variants of UnixWare
after 1992. I know that Microport ceased developing an internal
product and carried re-branded UnixWare after 1992, but is a
clean version of Release 4 from Microport out there? Somewhere I
saw a person refer to Microport's version of Release 4 as "System
V/386," but that is actually a Xenix label as far as I can tell.

Any help you could provide in tracking down a copy or just
the history of the Microport distributions would be greatly



July 9th, 2010, 09:46 AM
Hi boomer,

I replied in an email, but to reiterate, my recollection is that there was a Microport SVR4.0 before Microport stopped doing their own development. Pretty sure I ran it in production for a couple of years as the basis for a public access Unix system. I ran uPort SVR3.2 before that, and went back as far as SYSV/AT. I was a loyal uPort customer for 5 or 6 years before moving on to SunOS and other stuff.

Unfortunately, though I have a few other PC Unixen, I don't have Microport SVR4. I do have 3.0 and 3.2.


July 9th, 2010, 04:40 PM
Many thanks for your forum post and email replies Pitlog. I am sending you an email response to continue our separate conversation regarding Microport System V/AT.