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Path: utzoo!utcsrgv!peterr
From: peterr@utcsrgv.UUCP (Peter Rowley)
Newsgroups: net.micro.pc
Subject: Bug on PC motherboard
Message-ID: <1738@utcsrgv.UUCP>
Date: Tue, 12-Jul-83 21:35:15 EDT
Article-I.D.: utcsrgv.1738
Posted: Tue Jul 12 21:35:15 1983
Date-Received: Tue, 12-Jul-83 22:54:13 EDT
Organization: CSRG, University of Toronto
Lines: 24

I asked the Toronto Computerland about the colour bug, and they even said
they phoned IBM about it, but they were of no help.  So I checked the new
tech. ref. manual at the IBM Product Centre.

  The circuit containing the crystal has changed.  Here are schematic
fragments, from the Aug 81 tech. ref. man. and the latest, 1983 ed.:

--------                                 -----------
     X1|----+----                                X1|-----+------
       |    |   |                                  |     |     |
8284A  |  10pF 5-50pF var.               8284A     |  510ohm  5-30pF var.
       |    |   |                                  |     |     |
       |    ----+                                  |    gnd    |
       |        |                                  |           |
       |       XTAL 14.31818MHz                    |    gnd   XTAL 14.31818MHz
       |        |                                  |     |     |
     X2|---------                                  |  510ohm   |
       |                                           |     |     |
       |                                         X2|-----+------
--------                                 -----------

     1981                                        1983

Do you know of any other hardware bugs that IBM has fixed?