another mysterious chip - test-drb@ccmp.vtda.org

29 Mar 2006

It is the standard CUT (color-lookup table) used in pretty much all the
early VGA especially IBM.  AD is analog Devices which had a compatible
one.  I don't have the time to get the datasheet out now (have midterms
this week), but I know I definitely have them (its in the graphics
databook as well which I certainly have), so when I have the time, I'll
put them online...

Ram

...
  -----Original Message-----
 From: cctalk-bounces at classiccmp.org 
 [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Chris M
 Sent: Saturday, March 25, 2006 5:08 PM
 To: cctech at classiccmp.org
 Subject: RE: another mysterious chip

 whos AD? It seems the PS2 model 25 has something
 similar also (G171?). I was hoping there was nothing
 but off the shelf stuph on this thing. I have an IBM
 PGA card on the way - does that have a crt controller
 also in addition to an 8088? Seeing that these things
 may have formed the basis for the VGA, what other
 cards/systems have them? I would really appreciate the
 data sheet if you can find the time.
 --- cctech-bounces at classiccmp.org <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

 > -----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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