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From: micki@thraine.UUCP (Michelle Stone)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: Zenith Z-159 memory upgrade problem
Keywords: zenith memory upgrade
Message-ID: <468@thraine.UUCP>
Date: 27 Jul 90 23:48:07 GMT
References: <52252@iuvax.cs.indiana.edu>
Reply-To: micki@thraine.UUCP (Michelle Stone)
Organization: Valid, San Jose, CA.
Lines: 18

In article <52252@iuvax.cs.indiana.edu> ebrill@ddsw1.mcs.com (Ed Brill) writes:
>I have been trying for the last two months to upgrade the memory in my
>Zenith Z-159 PC XT clone.  A coworker generously donated some 256k

>Through some calls and some research, I found that the boys in Michigan
>designed their system to require what they call "Control PAL" chips on the
>board to allow the system to use memory beyond 1 Meg (640 usable).  The
>catch here is that nobody stocks these chips because they are Zenith
>proprietary...and ZENITH ONLY SELLS THEM AS PART OF AN EMS UPGRADE KIT,


Welcome to the wonderful world of Zenith Computers... I had a similar
problem with a machine that I purchased many years ago.  While disk
and memory prices plummeted, those for my machine upgrades remained
excessively high.... so I dumped the machine.  In any case, I would
suggest that you find your nearest HeathKit dealer and just go 
order the parts you need.  Yes, they sell Zenith stuff as kits and
you can always get replacement parts through them.  Good luck!