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From: gino@sdchema.UUCP (Eugene G. Youngerman)
Newsgroups: net.micro.pc
Subject: Zenith PC-Clone
Message-ID: <435@sdchema.sdchema.UUCP>
Date: Sun, 18-Aug-85 18:03:59 EDT
Article-I.D.: sdchema.435
Posted: Sun Aug 18 18:03:59 1985
Date-Received: Fri, 23-Aug-85 11:34:24 EDT
Distribution: na
Organization: Chemistry, UC San Diego
Lines: 28
Xref: tektronix net.micro.pc:05378 

We are about to purchase a Zenith 158 (IBM PC Clone)

I would like to beef the memory to 640K, and to add a couple of
additional serial ports.

I have been told that the primary board in this computer 
has 3 banks for memory, one of which is filled with 256K.

In order to make it 640K, I am supposed to fill the additional
two banks with 256K chips, and then let DOS ognor the extra 128K.

What I would like to know is, what is the difference between 150ns and
200ns chips.  Also, what is the difference between low drain and 
high drain.  I am confused.

Also, since I want to add two serial ports, and since the computer 
does not come with a clock/calendar, which boards should I look
into?  I suppose I should put on one board with a serial and 
clock/calendar, and one board with just a serial.  Suggestions?

Thanks in advance.

GINO

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gino@CHEM.UCSD.ARPA
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