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1987-07-22
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238 lines
July 13, 1987
Sparta PCBoard
Hard Drive Conference
(201) 729-7056
Sparta PCBoard recently began using and selling an advanced RLL Hard
Disk Controller made by a company caller Perstor Data Systems, Inc. We
are offering this controller at substantial savings over the suggested
retail price, along with telephone support, and our usual 24 hour a
day support through the Sparta PCBoard Hard Drive Conference. Below is
a description of the controllers, along with a list of drives that
have been certified by the manufacturer to work with the controller,
and, lastly, a list of those drives known not to work with the
controller.
Perstor Data Systems, Inc., currently offers one line of
controllers... the Perstor 200 Series. In this line of controllers
there are two models, the PS180 and PS200. Both models utilize the
Advanced Run Length Limited 2,7 encoding method.
The Perstor PS180 Controller has a data transfer rate of 9 megabits
per second to increase hard disk capacity by at least 90% and provides
format of 31 sectors per track. The PS200 Controller has a data
transfer rate of 10 megabits per second to increase hard disk capacity
by at least 100% and provides 34 sectors per track. Both controllers
are ROM residence selectable and port address switchable to allow you
to have more than one BIOS ROM controller. In addition, the PS180 and
PS200 are multi-layer controllers, reducing electronic noise in the
circuitry.
The Perstor 200 Series Controllers will work with virtually any high
quality Winchester disk drive compatible with the IEEE specifications
for the ST506/412 interface. Perstor has conducted successful
qualification tests on most of the popular fixed disk drives in the
market today, including Miniscribe, Seagate, Maxstor, Newbury Data,
CDC, LaPine, Rodime, and other models (listed at the end of this
article).
The PS180 Controller works with MFM and RLL approved drives, plated
and oxide media, and the PS200 Controller works best with RLL approved
plated media drives, whether installed in a PC, XT, or AT or any of
their compatibles. Both controllers use a IBM compatible BIOS, so
they are compatible with MSDOS, PCDOS, UNIX, XENIX, and CPM, as well
as Novell Netware.
Both the PS180 and PS200 Controller are capable of supporting drives
with 15 heads or less and 2048 cylinders or less. They come with an
Advanced Error Checking and Correction capability using a 56 bit code
to allow twice the bit dropout factor of normal controllers. In
addition to this 56 bit ECC, both models have a 25 megabit data
recovery circuit, and on both controllers is a sector buffering RAM
chip to overcome speed differences between the drive and the
controller.
On both models, you have your choice of mounting hard disk drives
internally or externally, and using the controller as a primary, co-
resident, or multiple controller. Plus, you have the option of setting
up the controller for BIOS or non-BIOS use, and can have either Direct
Memory Access or programmed input/output.
DiskExpander, a compaction software program packaged with the Perstor
Controllers as a no-cost option, provides another 50% increase in
capacity above the doubling provided by the controller. DiskExpander
is enhanced by a cache access method that lowers the average access
time to about 15ms when used. However, this compaction software
program needs a DOS 3.1 or higher environment.
Approved Drive List
The following drives have been successfully tested by the manufacturer
with the Perstor 200 series controllers.
Miniscribe Seagate Maxstor Tandon Rodime
MS3212 ST225 XT1065 TM362 3055
MS3425 ST225-003B XT1085 352
MS3438 ST238 XT1140
MS6032 ST251
MS6053 ST4038 Newbury CDC Lapine
MS6085 ST4096
MS8425 1140 WREN 2 Titan 30
MS8435
Additionally, I have personally tested and helped format the Fujitsu
72MB drive, the Maxstor XT2150, and several CDC Wren I drives. The
Maxstor XT2190 Drive has also been successfully formatted and operated
on a network under heavy usage and has performed flawlessly.
Some of the experiences so far have been:
1) The Seagage 4096 and Maxstor XT1085 are being used on Sparta
PCBoard 24 hours a day. MACE and Norton's DT have been run on the
drives every single day for the past month and neither have picked up
a single soft sector or hard sector error that was not picked up
initially by Disk Manager or Vfeature.
2) Chuck Ammann is running a Maxstor XT2140 that is currently
formatted on a PS200 10mbits per second controller and he was able to
get 196MB on on 1024 cylinders out of a possible 1224 cylinders that
the drive has. We had a chore formatting his drive until we got the
right ROM BIOS table burned and installed.
3) Other Sysops running the Perstor Controller
Paul Kopit - Software Society
Neil Leder - Doctor's Office BBS
Paul Waldinger - Sound of Music BBS
Gary Thurlow - Wilmington Delaware BBS
Lee Windsor - Hounds Haven BBS
Eric Green - ELCO Base BBS
Miles Lester - Xignals PCBoard - Auburn Alabama
4) Our experiences so far have been from almost flawless installation
to hair-pulling teeth-knashing sessions that took several hours. Why
the differences? Beats the heck out of me. We have the controllers
installed in a mixed bag of machines such as 12mhz Clone, Olivetti
M28, AST Research Premium 286, Multitech Accel 900, IBM PC-XT and a
stock IBM AT machine.
5) Problems reported so far..
1.. Does not work real great with SpeedStor prior to 4.02 since
Speedstor up to this version would not support 34 sectors per
track needed by the PS200. If you do use the PS200, you cannot
use an even interleave such as 2, 4, 6, or 17, though the
controller supports interleave all the way up to 30.
2.. Appears to hangs for unexplainable reason during a low level
format using Vfeature Deluxe. Though you can then start the
process over and usually will go completely through the second
time.
3.. Will not work with some Seagate ST4038. Will find out what
revision.
4.. Will not work at all with a CMI Drive. But then what does work
well with this drive?
5.. Will not work with older Priam Drives. Though seems to work AOK
with current production run of the Priam. Priam does a test to
track 0 after receiving a positive indication that it has done
a seek to track 0. Current software does not support the extra
test. Will do so in the future.
6.. Limited size BIOS Tables. Though there are only four drive type
types in the current BIOS, with the next production run, the
BIOS will support 16 drive types in each table and the two
drives on a card can be of two different types.
7.. Does not currently have any way of hooking up the activity
indicator light on AT type machines. I have drawn up a circuit
design that will allow your controller to be modified if you
need an activity indicator light on the front of your AT.
What is the ideal interleave to use? That is a tough question to
answer and depends a lot on your mix of drive, speed of machine, speed
of RAM, etc. I have devised a very good method of only formatting the
first 100 tracks of any drive until I have tested it at several
different interleaves. Only after I have found the right interleave
for my hardware combination do I format and partition the entire
drive.
How does this controller co-exist with the floppy/hd controller in an
AT? Good question. It is simply a matter of running your setup program
and telling the setup that you do not have any HD installed. Plug the
Perstor in, hook up the hard drive and let er rip.
Perstor plans in the near future to have a combination floppy/HD
controller that will give the same blazing fast performance as their
current 8 bit line of controllers. Should you wait til then? That is a
decision only you can make. Are you running out of room? Need some
cheap additional storage in a hurry at a very reasonable price. The
Perstor Series 200 is the way to do it.
What 32MB barrier software has been tested on it. We have used Speed
Stor, Vfeature, and Disk Manager. Favorites at this point? Vfeature
seems to the the favorite. Disk Manager version 3.01 works superbly
with the disk controller also. That is what I am currently running at
Sparta PCBoard. Though I own and have tried all three of the above
mentioned packages.
Pricing!
Suggested Retail My price
Perstor 180 - 9 Mbits Per second $395.00 $295.00
Perstor 200 - 10 Mbits Per second $495.00 $395.00
Disk Manager 3.01 (or current version) $99.00 $60.00
Telephone Support (corporate) $50.00 Per Hour $50.00
Telephone Support (individual) $50.00 Per Hour $Free
Bulletin Board Support $Free $Free
You pay the phone bill is all that is required. Shipping will be at
your direction, surface UPS or overnight. Fedex Saturday Delivery if
you have an account with Federal Express. You pay the shipping.
Need Special ROM burned to fit your particular drive combination?
Let me know. I can burn an eprom with whatever table you need in
the BIOS ROM.
Method of payment?
Since I don't do this for a living and am just trying to help people
get some more storage at a cheap price, I am only looking at a modest
profit on this deal. Therefore, I need the money up front to keep my
cash flow going. Money Order or certified funds preferred unless I
know you and have done business in the past. Hey, at these prices, I
cannot afford funny money, right?
Address where I can be reached
Richard Driggers
47 Conestoga Trail
Sparta, NJ 07871
Phone Number where I can be reached
(201) 729-9409 Home
(201) 729-7056 BBS
Thanks in advance.