Your mystery chip is clearly Motorola, a very good guess is that it's a 6845
CRT controller chip, or at least a derivative thereof.
Message: 7
Date: Sun, 19 Mar 2006 20:28:15 -0800 (PST)
From: Chris M <chrism3667 at yahoo.com>
Subject: another mysterious chip
To: tech <cctech at classiccmp.org>
Message-ID: <20060320042815.79263.qmail at web61019.mail.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1
First line: circle possibly with M in it, INMOS B.
Second line: IMSG170S35 (pretty sure). Third line:
8611 - obviously date of manufacture. Chip has a gold
cover, and is present on a dual 8-bit graphics card
made by Vermont Microsystems, 80188 on board (similar
to an IBM PGA card). Works in a P166MMX DTK mobo...but
not in my IBM PC/AT. And yer know what else...it
emulates CGA (pretty well seemingly, but only tested
it with QBasic thus far). O for the drivers to access
its wild advanced modes *snifful*.
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