UCI Eazy-87 board modification

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#114

From: Usenet file owner
Date: Thu, 14 Sep 1989 12:23

33 lines
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Someone asked about the modification for the UCI Eazy-87 board for the 
Z-100.  I installed this board and did the modification a couple of years
ago.  My Z-100 is a low profile, 768K, running at 8 Mhz. 

The symptom is that the Z-100 locks up erratically when the Eazy-87 is
installed.  The cure is to install a 100 pF, 50 V Ceramic capacitor across
a couple of pins where the ribbon cable connects to the Eazy-87 board.
This modification was provided by one of the technicians at UCI.  I've had
not had any lock up problems since I installed it. See the diagram below:

          -----------------------------------------------------------
          | .       .                                               |
          | .\      .                                               |
----------| . \     .    Connect the 100 pF 50V          Foil side  |
          | .  )| \ .    ceramic between the 1st         of circuit |
          | .      \.    pin on the left row and         board      |
          | .       .    the 5th pin on the right row.              |
Ribbon    | .       .                                               |
cable     | .       .    The leads can be "tacked" to the           |
          | .       .    pins with a small amount of solder.        |
          | .       .                                               |
          | .       .                                               |
----------| .       .                                               |
          | .       .                                               |
          | (more pins than this)                                   |
          ----------------------------------------------------------


Mark Urban-Lurain                        urban@cpswh.cps.msu.edu
Computer Science Dept.                   urbanluraimg@clvax1.cl.msu.edu
Michigan State University
A-714 Wells Hall                         (517) 353-0682   office
East Lansing, MI     48824               (517) 355-5210   department

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Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!uxc.cso.uiuc.edu!tank!eecae!cps3xx!usenet
From: usenet@cps3xx.UUCP (Usenet file owner)
Newsgroups: comp.sys.zenith.z100
Subject: UCI Eazy-87 board modification
Keywords: Erratic lockup cure.
Message-ID: <4602@cps3xx.UUCP>
Date: 14 Sep 89 12:23:55 GMT
Reply-To: urban@frith.UUCP (Mark Urban-Lurain)
Organization: Engineering, Michigan State University, E. Lansing
Lines: 33