That is the INMOS G170 graphics chip. Used in the IBM graphics cards.
I got the datasheet somewhere in my house :-)
I remember AD also made a pin-compatible version of it too...
Cheers,
Ram
-----Original Message-----
From: cctalk-bounces at
classiccmp.org
[mailto:cctalk-bounces at
classiccmp.org] On Behalf Of Chris M
Sent: Sunday, March 19, 2006 11:28 PM
To: tech
Subject: another mysterious chip
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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