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From: korn@cory.Berkeley.EDU.UUCP
Newsgroups: comp.sys.mac
Subject: DataFrame 20/40 XP upgrade
Message-ID: <1091@zen.BERKELEY.EDU>
Date: Fri, 21-Nov-86 23:28:51 EST
Article-I.D.: zen.1091
Posted: Fri Nov 21 23:28:51 1986
Date-Received: Sat, 22-Nov-86 06:48:58 EST
Sender: news@zen.BERKELEY.EDU
Reply-To: korn@cory.Berkeley.EDU.UUCP (Peter "Arrgh" Korn)
Organization: University of California, Berkeley
Lines: 36


I just got my XP upgrade yesterday (came on the first shipment of 'em
to that store), and installed later that night.  The upgrade consists
of a new PROM chip inside the DataFrame, and a new initializer program.
The new PROM necessitates reformatting of the drive--you cannot
get just part of the speed increase by putting in the chip but not
the reformat.

However, you will see a slight increase in speed by just installing
the new "drivers" using the initializer 2.1 (to be found in the 
~/pub/mac directory of ucbvax.berkeley.edu's public ftp).  The
timings I got using DiskTimer (the older version) were as follows:

Initializer 1.5		2.1 drivers	2.1 initialized		full XP

~29.x read/write	~27.x r/w	~21.x r/w		15/14.9 r/w

So, as SuperMac claims, the XP gives about a 100% speed increase, given
32K blocks per read/write.  But, it's worthwhile noting, for folks who
have better uses for their $80-$100 than an XP upgrade, you can get
a ~30% increase JUST FROM THE NEW INITIALIZER.


With all of my SuperMac/Dataframe related postings, I believe it's time I 
made something clear...

DISCLAIMER:  I neither work for SuperMac, nor do I directly benefit from
the sale of any SuperMac products.  I'm merely a very satisfied customer,
and a non-commission salesperson who has been very happy recommending
this drive to my customers.

Peter
-----						  
Peter "Arrgh" Korn		           I know lots of honorary jews!  Why,
korn@ucbvax.Berkeley.EDU			  some of my very best friends
{decvax,dual,hplabs,sdcsvax,ulysses}!ucbvax!korn            are honorary jews!