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From: nessus@nsc.UUCP (Kchula-Rrit)
Newsgroups: net.micro.ti
Subject: Re: Radio Shack power supply for TI-99/4A
Message-ID: <2623@nsc.UUCP>
Date: Tue, 23-Apr-85 15:06:37 EST
Article-I.D.: nsc.2623
Posted: Tue Apr 23 15:06:37 1985
Date-Received: Wed, 24-Apr-85 14:18:07 EST
References: <900@wucs.UUCP>
Distribution: na
Organization: The Patriarchy of Kzin, Kzin
Lines: 45

> 
> 	A couple of months ago, someone asked if the power supply being sold
> for $4.95 by Radio Shack ran cooler than the power supply which came with the
> TI-99/4A.  I installed one, and it does run quite a bit cooler.  I believe,
> however, that this may be the same power supply used in the newer gray
> computer, so if you have this model, it would not do you any good (I have not
> looked at the power supply in the gray model, but it seems to run pretty cool
> already).  Otherwise, it is well worth the $4.95, if you can still find one.
> -- 
> 
> Steven Karasek				sfk@wucs.UUCP 
> Box 1045 Washington University		(ihnp4!wucs!sfk)
> St. Louis, MO 63130   USA		(314)-889-5098

*** REPLACE THIS LINE WITH YOUR MESSAGE ***

     I am the person asking if the RS power supply runs cooler than the TI
supply.  In August 1984, my TI's -5V supply overheated and shut down, taking
out EVERY chip that uses -5V.  This includes the CPU, RAM, GROMS ("proprietary"
ROMS) and, I'm sure, many more that I can't remember right now.  TI gladly
exchanged it for a new/reconditioned one for $28.50, but it was a hassle being
without my computer for a week.  So, when I got the new console, I promptly put
a "muffin(tm)"-type fan on my computer table pointing into the console.  Ah,
the wonders of duct-tape!  The fan is a klugy set-up at best, and rather
hazardous at worst without a fan guard.  So when RS advertised their supply, I
snapped one up.  Unfortunately, I haven't put it in or powered it up yet, so I
don't know about its operating temp/voltage yet.  I've heard that switching
supplies generate more RF noise than linear supplies do; can someone
verify/disprove that?  In a sense, that does not concern me, because I do not
use a TV as my display any more, but I still don't want the Feds to come
pounding on my door.

     I will post a note telling how to connect a monitor to your TI 99/4A, or
at least how I did it.  Also, I will try installing the supply in my computer
and let the net know how it works out.


					Kchula-Rrit
					!menlo70!nsc!nessus


P.S. John, I haven't forgotten; I've just gotten my schematic-drawing software
     up and running with "reasonable" reliably.

					K-Rr