Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!swrinde!cs.utexas.edu!sun-barr!newstop!texsun!letni!rwsys!merch!cpe!hal6000!nemesis!uhclem
From: uhclem@nemesis.UUCP
Newsgroups: comp.sys.tandy
Subject: Re: Tandy 1000 TL upgrade
Message-ID: <-31055@nemesis>
Date: 18 Mar 91 11:42:06 GMT
References: <24811@iitmax.iit.edu>
Lines: 31
Nf-ID: #R:iitmax.iit.edu:24811:nemesis:-31055:000:1379
Nf-From: nemesis.UUCP!uhclem    Mar 17 11:02:00 1991


<>
>My question in mind is this:  Will the 1000 TL have at least a 10% increase
>in performance if I replace the memory with 120 or 100 ns chips,

Only if you reconfigure the bus timing to eliminate any wait states.
Note that the upper 256K is driven via the video controller, and depending
on the video mode you are in, you can have up to 12 wait states on each
access (Mode E is the worst).

> and/or replace the 80286-8 with a 80286-12?

Won't do a thing unless you change the master clock up to 24 MHZ (to drive
a 12 MHZ part), and replace most of the support chips including the custom
ones.  They were all designed to work at 8MHz, and if they happen to work
as 12MHz, you are just lucky, that's all.  Nobody designing those parts
said "someone might bump the speed up to 12 MHz, better improve the
design to handle it".   :-(

If you change the CPU speed, then you really will have to put faster RAM in.

>Also, if anyone has the Technical books for the 1000 TL, please, I need to
>ask you a few things about the motherboard.

Tandy does have a technical reference that is ok.  You can order it from
a store or directly from National Parts.


Frank Durda IV <uhclem@nemesis.lonestar.org>|"How do I know?  I make that 
...letni!rwsys!nemesis!uhclem	            | silly machine hoot and whistle
...decvax!microsoft!trsvax!nemesis!uhclem   | for the customers, that's how."