Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!jgreco
From: jgreco@csd4.milw.wisc.edu (Joe Greco)
Newsgroups: comp.sys.cbm
Subject: Re: SEQ file access speedup
Message-ID: <955@csd4.milw.wisc.edu>
Date: 14 Feb 89 02:35:29 GMT
References: <913@csd4.milw.wisc.edu>
Sender: news@csd4.milw.wisc.edu
Reply-To: jgreco@csd4.milw.wisc.edu (Joe Greco)
Organization: Starbase 74 - Starfleet Operational Support Services
Lines: 27

As promised, here are some access times for various sequential mode
disk accesses.  The files were not all identical, but I am including a
CPS rating to account for that.

Device(s)		Time	Filesize CPS	%speed
----------------------- ------- -------- ------ ------
Regular 1541/C64        01:35.2    33453    351    100
C64/BusCard II/8050     00:31.8    30234    952    271
C64/Custom MSD/8050     00:17.3    30234   1745    497
C64/RAMDOS 3.2/1750     00:12.2    38760   3188    908

The "Custom MSD" interface pushes the IEEE bus much closer to
Commodore's specifications than the BusCard II.  Actually, I'm
suprised at the huge difference there.  The RAMDISK is nearly ten
times as fast as the standard serial bus access.  It would seem to me
that it would well be possible for a more efficient design to be
implemented.
 
As a side note:  The way my memory recalls, the IEEE bus is actually
capable of megabyte/second rates.  Of course, my magnetic media is
probably flaking again....

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