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From: bill@ssbn.UUCP (Bill Kennedy)
Newsgroups: comp.sys.att
Subject: Disabling PC 6300 video
Message-ID: <371@ssbn.UUCP>
Date: Wed, 16-Sep-87 12:17:37 EDT
Article-I.D.: ssbn.371
Posted: Wed Sep 16 12:17:37 1987
Date-Received: Sun, 20-Sep-87 02:27:56 EDT
Organization: W.L. Kennedy Jr. & Associates, Pipe Creek, TX
Lines: 27

There has been a fair amount of discussion about using different video
cards in the PC 6300 and PC 6300 PLUS.  Excuse if this has been posted
before, I haven't seen it.

You can disable the video card on a PC 6300/PC 6300 PLUS by making up a
header to replace the address decode IC.  This is done by connecting the
following pins together on the header:
3 to 8 to 11 to 14
6 to 7
Then replace the 74LS00 IC at location 6H on the display controller (that
is slightly up and to the left of the power connections at the center of
the board.  The wiring should look like this:

 7   6   5   4   3   2   1
 |   |           |
 +---+           |
                 |
 +-----------+---+-------+
 |           |           |
 8   9  10  11  12  13  14

Note that these instructiona apply to the P4 display controller.  This just
kills the address decode so that you can use a different video card.  There
is no reason it shouldn't work fine under DOS, Simul-Task functions for The
Office will probably be quite different.
-- 
Bill Kennedy  {cbosgd | ihnp4!petro | sun!texsun!rrm}!ssbn!bill