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From: halkoD@batman.moravian.EDU (David Halko)
Newsgroups: comp.os.os9
Subject: Re: TC-70 vs MM/1
Summary: QT
Message-ID: <2658@batman.moravian.EDU>
Date: 14 Feb 91 16:08:18 GMT
References: <1990Dec28.012907.24001@davidge> <2535@batman.moravian.EDU> <172@blars>
Distribution: usa
Organization: Moravian College, Bethlehem, PA
Lines: 54

In article <172@blars>, blarson@blars writes:
>> halkoD@batman.moravian.EDU (David Halko) writes:
> >The TC-70 comes with more memory than the MM/1 (from what I last remember...)
> >
> >Because of the extra memory, the TC-70 is slightly faster than a stock MM/1.
> 
> Extra memory does not, in general, speed up an osk system.  (Ghost
> modules are kicked out if memory is tight, and putting more stuff on
> ram-disk can speed a system, but if your system has enough memory,
> adding more will not speed it up.)

The slowdown I am speaking of occurs when 68070 and VSC's working memory
overlaps, taking up the same address space. That little bit of extra memory 
(from what I understand) is allocated outside of the VSC space, since the
VSC only addresses 1 Meg, thus is accessable faster to the 68070, speeding
the machine up... as long as the total ammount of memory is over 1 Meg in 
any VSC/68K combination, memory access outside of the initial video 1Meg will
be faster than outside the 1Meg... I remember a few people saying that this
is the case with many graphical based computer systems (including the Amiga.)
 
> >The TC-70 will act as a direct mother board replacement for owners of
> >QT systems,
> 
> Only K-Bus systems.  My QT+ and QT20x are not K-bus based.

From what the literature read, the TC70 card was supposed to fit into the same
case & mounting holes of the previous QT's... I could be wrong, but I distinctly
read this. Literature is sometimes wrong, sometimes there are misprints. But
then again, would you feel that the graphics would be that big of a difference
in your case, to drop a 68020 CPU for a 68000 based CPU?
 
> >FHL has been around for quite a few years (over a decade) and delivers 
> >excellent support! He has delivered me nothing but the greatest support 
> >over the past couple of years with technical assistance for the 
> >equipment that I had purchased from him. 
 
> Frank is a nice guy, but don't make any purchases based on "this will
> be available".  (His plans quite often don't become reality.) If you
> want info on os releases, new boards, etc. in a timly fassion, you
> have to call him and ask.  The extra software he supplies is porly
> documented, and at least one program he gave me had a real nasty bug.

His documentation quite often needs help... that is a definite fact from past
experiences! As an experienced user, I really have no problems, but a starting
user may be inclined to be a little confused about things! (One friend...
well, that is another story...) 
 
> 
> -- 
> 		C news and rn for os9/68k!
> -- 
> Bob Larson (blars)	blarson@usc.edu			usc!blarson
> 	Hiding differences does not make them go away.
> 	Accepting differences makes them unimportant.


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