AT&T 7300 question

[thad at cup.portal.com]

The UNIX PC (aka 3B1 aka 7300) has a MC68010 clocked at 10MHz, and a custom
MMU onboard.

There is a plug-in card with an 8MHz 8086 such that you can run MS-DOS
in a UNIX window (much like the BridgeCard of the Commodore Amiga A2000);
a colleague at work has the "DOS-73" card in his home 3B1 and is very
happy with it; I don't have that card in any of my 3B1s so cannot comment
from firsthand experience.

The 3B1 was manufactured by Convergent for AT&T.