21 Mar
2006
21 Mar
'06
4:36 a.m.
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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28 Mar
28 Mar
5:05 p.m.
Thanks to you I was able to identify it adequately.
But to call it a graphics chip is deceiving (i.e it's
not a crt-controller). It's a RAMDAC. Probably one of
the earliest cards to support analog color (hence the
need for one). Probably also present on the IBM PGA
card (or something equivalent). Yes, the PS/2's all
seem to have the G171.
--- Ram Meenakshisundaram <RMeenaks at olf.com> wrote:
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
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Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com
-----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*.
__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam
protection around
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