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- 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.