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From: bfag@ur-tut.UUCP (Meneldur)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Need help with Zenith-150 & EGA
Message-ID: <117@ur-tut.UUCP>
Date: Tue, 22-Sep-87 22:23:25 EDT
Article-I.D.: ur-tut.117
Posted: Tue Sep 22 22:23:25 1987
Date-Received: Fri, 25-Sep-87 01:49:17 EDT
References: <311NU105451@NDSUVM1>
Reply-To: bfag@tut.cc.rochester.edu.UUCP (Meneldur)
Organization: Univ. of Rochester Computing Center
Lines: 29
Summary: You ain't done yet!

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In regards to your Z150/EGA problems, I think you'll find the answer in rather
antiquated BIOS chips.  With our own H150, we followed the same route as you
did, disabling the CGA card with Zenith's rather pitiful quick fix (the thought
of all that electrical power being wasted to support a bit of RAM is pretty    
disgusting!).  We found, as you obviously did, that the EGA board went 
unrecognized.

You need to order the newest version of the BIOS chip set from Heath's Parts
Department.  The two chip set will cost you about $20 plus postage.  Sorry...
you'll have to wait for the U.S. mail to get it to you, but you can speed it
up a bit by requesting 1st class delivery.

Install the new chips and you should be up and running.  Just be CERTAIN that
video select DIP switches are properly set on the Z150.  As I recall, one of the
articles appearing in Computer Shopper on installing the EGA in older units had
the switches wrong.  Sorry, I don't have the manuals handy to verify your
switch settings.  Well, at least there are only four possible combinations
you have to deal with :-)

Good luck!


Bill Faggart
Dept. of Geological Sciences
University of Rochester
Rochester, New York

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