> Does anyone know of any parallel port hard drives that will work with
with
> my Sharp PC-7000? I only ask because, for some odd reason, whenever I
copy a
> DOS program to a floppy (360K) in Windows, it does not want to work on
the
> Sharp, but works flawlessly on the Windows box (in a DOS window, of
> course!). What could be happening? Is there something obvious that I'm
not
> doing right?
Are you using a 1.2MB floppy drive to write a 360K floppy disk?
<I have a full backup of the drive via COPY. I would like to graft a
<different hard disk onto this machine.
If the second slot is clear you can run two hard disks. that means pulling
the floppy to do it. You don't however wire it like a PC.
<How do connect the second drive? There are connections for a second
<drive but both are on the machine and not with the 34 pin connector
<daisy-chained to the first drive as is normal. Do I terminate each drive
<in this "Y" configuration? What drive number should it be? Drive 4 I
<suspect as the first and only hard disk is set at 3 and is terminated.
No. You use two 34s and two 22s you will see drive o and drive 1 on the
plate behind the HD/floppies. RT11 has a logical drive limit of 32mb
so a good drive is the RD52 (quantum D540) as it's both 31mb and of all
the MFM drives I've used it's rugged and reliable. The largest drivew
the RQDX3 can handle is 16hx17sectors by some 2048 cylinders (~500mb)
but the largest ever used by DEC was the RD54 (159mb, Maxtor 2190).
<How would I configure drive geometry to match the drive I am installing?
If the drive is formatted DEC compatable (PC cant!) the controller is smart
enough to figure it out. If the drive is formattet non-dec you need the
PDP-11 formatter to do it or a microvax2000 (has a formatter in rom).
<The object of installing a second hard disk is to create a bootable clone
<of the first one. A bump in disk space is allways cool but I want a
<bootable clone as a backup at least.
You can backup to floppies. RX50 is ~400kb a disk.
<Does the ST506-type controller have enough Shugart SA400 about it that it
The controller is not a the PC style of st506(which is a drive interface
standard). The RQDX controller is extremely smart and has it's own PDP-11
in the form of the T-11 chip. The controller take the MSCP protocal and
does a lot of work to translate that high level protocal to actual drive
activity. I does so basic caching and queueing as well and uses DMA to
get and put command and data. Nothing like that in your average PC that
used similar MFM drives.
<is running the floppies as drive id's 1 and 2? It would explain a lot.
Sa400, never much too small. If it is RQDX3 (dual width board) then you
can use or or two of the TEAC FD55GFV to get both RX50 (400kb) and RX33
1.2mb formats.
<How difficult is it to substitute a standard double-sided floppy mech for
<the wierd but nifty-looking floppy drives that are in it now? For those
<of you still wondering, it has an RX50-AA double-drive unit that cannot be
<formatted by the computer but can be read.
Correct, formatting is not permitted by the controller due to software and
the DEC RX50 drives were junk. You can format disks on PCs... PUTR can
but you much have dual mode 1.2mb drive like the teac mentiond.
<Will I be able to format media on the machine if I DO replace the drives?
No. Yo need the diagnostic to drive the controller.
<Can I substitute a standared 40trk X DS X DD mechanism or an 1.2mb 5.25"
NO. Both the RX50 and the FD55gfv are 96tpi.
<mech to accomplish this? The connections look standard though I have not
<opened the base enclosure for the floppy mechanism for a look at it's
<cabling yet.
The cabling and interface will run standard 5.25 96tpi drives.
Bet you got more than you wanted. But all of the burried majik is why
in 1987 11/23 (or 11/73) could support a raft of users with a cpu that
some considered a wimp compared to the mighty 386/16(which still cant)
Allison
Does anyone know of any parallel port hard drives that will work with with
my Sharp PC-7000? I only ask because, for some odd reason, whenever I copy a
DOS program to a floppy (360K) in Windows, it does not want to work on the
Sharp, but works flawlessly on the Windows box (in a DOS window, of
course!). What could be happening? Is there something obvious that I'm not
doing right?
____________________________________________________________
David Vohs, Digital Archaeologist & Computer Historian.
Computer Collection:
"Triumph": Commodore 64C, 1802, 1541, FSD-1, GeoRAM 512, Okimate 20.
"Leela": Macintosh 128 (Plus upgrade), Nova SCSI HDD, Imagewriter II.
"Delorean": TI-99/4A.
"Monolith": Apple Macintosh Portable.
"Spectrum": Tandy Color Computer 3.
"Boombox": Sharp PC-7000.
____________________________________________________________
______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com
>I have a full backup of the drive via COPY.
Onto....? Is your backup bootable?
> I would like to graft a
>different hard disk onto this machine.
>
>I have available in ST506-type is a fujitsu 40mb and a seagate st4096.
>How do connect the second drive?
The official way is with a 6-button front panel for your box... but
you've got a bigger question to ask yourself first: is your
disk controller a RQDX1 (M8639-YA), a RQDX2 (M8639-YB), or a RQDX3 (M7555)?
The answer will determine what sort of drives you can hook up.
>How would I configure drive geometry to match the drive I am installing?
You have to format the "new" drive with the appropriate XXDP formatting
program, ZRQB?? for a RQDX1/2, or ZRQC?? for a RQDX3.
>How difficult is it to substitute a standard double-sided floppy mech for
>the wierd but nifty-looking floppy drives that are in it now?
You're asking a lot of really basic questions about this sort of stuff,
enough to indicate to me that you haven't read the definitive FAQ
about the small DEC drive systems of this era. I highly recommend
that you read "third-party-disks.txt" available from ftp.spc.edu
and other places, it will answer a *lot* of your questions like this.
But, the short of it is, if you have a RQDX1 or 2 you can't put the
same drives on it as if you had a RQDX3, and we can't make any specific
recommendations until you tell us which you have.
--
Tim Shoppa Email: shoppa(a)trailing-edge.com
Trailing Edge Technology WWW: http://www.trailing-edge.com/
7328 Bradley Blvd Voice: 301-767-5917
Bethesda, MD, USA 20817 Fax: 301-767-5927
<It looks like the m7605 quarter-inch streaming tape controller has a bad
<PAL? and won't let the ram test continue. I removed it from the machine
No idea where you'd get one.
<and will look for a replacement IC to get it running. I don't have the
<drive anyway. Thanks for your quick response Allison! The machine does
<run just fine it appears even without the controller in.
Gotta love PDP-11s. ;)
<RT11 Version 5 / CTS 300 Version 8 is the system rev that posts at
<startup.
Killer, CTS300 on it! Nice, very nice! Sounds like it was configured as
a multiuser system.
Allison
Yeah, I used to maintain one of these beasts in the mid-80's.
It is a single 8086, with either 512 or 900-something k ram,
and it runs the Xenix-86 OS. The thing used a couple of Q540
disk drives, and with four users on it, swapped it's brains
out like you wouldn't believe.
The version of Xenix that was running on it at the time
couldn't decide if it was Edition 7 or System III-- fsck
said it was a System III fs, the banner on start up mentioned
something about Edition 7.
Anyways, it's amazing what some careful programming can
accomplish with <1MB ram, and an 8Mc 16 bit CPU. They
ran a cellular billing office with this thing, and they
would load subscriber data onto this thing from 7-track
(or was it 8-track ?) tape that they got from the mainframe.
I had to reload the Xenix OS once-- the default root password
is SOTLA :^).
Jeff
On Sat, 25 Mar 2000 08:09:04 -0700 "Richard Erlacher" <edick(a)idcomm.com>
writes:
> Well, this model 586 has 5-1/4" drives in the main unit and the tape
> drive
> is in a separate enclosure. These are desktop-style boxes, though I
> doubt
> theyd be used on a desktop. The hard drive is a full-height
> nominally 40MB
> 5-1/4" drive. I've left this thing alone, though it's a source of
> Z-80 type
> system parts. The HDC is a 2900-based number not particularly
> similar to
> any other that I can recognize. The tape unit hasn't been opened
> yet. I
> may get to that some day, but I see the two boxes as a source of
> parts and
> little else. They're pretty heavy, so I don't anticipate shipping
> them
> anywhere.
>
> Dick
________________________________________________________________
YOU'RE PAYING TOO MUCH FOR THE INTERNET!
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So, would any of our UK members like a VAX 11/750? Possibly one that
has a SCSI adapter?
If so, please get in touch with the fellow who originated the message
shown below. Thanks!
Attachment follows.
-=-=- <snip> -=-=-
On Sat, 25 Mar 2000 12:22:21 -0000, in comp.os.vms you wrote:
>>From: "Jonathan Hunter" <jonathan.hunter(a)stud.umist.ac.uk>
>>Newsgroups: comp.sys.dec,uk.adverts.computer,misc.forsale.computers.other.misc,misc.forsale.computers.other.systems,vmsnet.misc,comp.os.vms
>>Subject: First come first served: VAX 11/750 (UK)
>>Date: Sat, 25 Mar 2000 12:22:21 -0000
>>Organization: Totalserve Internet
>>Lines: 60
>>Message-ID: <8bib4t$ve$1(a)tcnnt0.totalserve.net>
>>NNTP-Posting-Host: jmhpc.ninja.org.uk
>>X-Trace: tcnnt0.totalserve.net 953987037 1006 195.226.56.170 (25 Mar 2000 12:23:57 GMT)
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>>Path: news.uswest.net!news-out.uswest.net!newsfeed.berkeley.edu!freenix!oleane.net!oleane!news-raspail.gip.net!news.gsl.net!gip.net!news.xtml.co.uk!news.totalserve.net!not-for-mail
>>Xref: news-out.uswest.net comp.sys.dec:9583 uk.adverts.computer:75561 misc.forsale.computers.other.misc:8472 misc.forsale.computers.other.systems:3702 vmsnet.misc:227 comp.os.vms:42164
>>
>>Hi,
>>
>>I have a vaguely complete VAX 11/750 system that I would like to get rid of.
>>The notes I have made describing the collection are as follows:
>>
>>Cabinet containing:
>>RA80 - hard disk drive
>>RA60 - disk drive unit - removeable
>>MODEL RA80-CD
>>
>>DECserver 200/MC
>>"Software Product Description" - April 1988, "The
>>DECserver 200 Terminal Server is a network terminal
>>switch for Enternet Local Area networks."
>>Ports - 8 serial ports; Ethernet AUI port.
>>Sticker with Ethernet address (08-00-2B-11-xx-xx)
>>P/N DSRVB-AB
>>C.S. REV B4 ECO C0006
>>MFG. Cloomel
>>------------
>>Model: DSRVB-A
>>
>>RM80. Built differently to rest, i.e. no seperable sides
>>etc.
>>Unit at top of cabinet; start/stop switches etc.
>>Controller unit underneath, slides out. Two massbus
>>sockets - one unconnected; presumably for cable. Other
>>has an empty connector in it. Rack full of cards, and
>>ribbon cable going to drive unit above.
>>MODEL RM80-AD
>>
>>Tape drive
>>MODEL TU81-CA
>>
>>132-column Line Printer
>>MODEL: LP25
>>VARIATION: BA
>>
>>VAX itself (11/750)
>>MODEL SV-BXWAA-AD
>>
>>Plus miscellanous tapes etc.
>>
>>There is also what appears to be a SCSI controller for the VAX, made by
>>SUMMUS Computer Systems. I understand that this is quite a rare item and
>>might be worth something.
>>
>>If anybody has a need for any of the above, I'm based in Manchester and you
>>are welcome to come and collect.
>>
>>If you don't want to make an offer for any of this, then I will allocate it
>>on a "first come, first served" basis. However if you do email me with an
>>offer (monetary, or offers of exchange for other interesting computer goods)
>>then these offers will take precedence over people wanting bits for free.
>>
>>Let me know if any of this is of interest.
>>
>>Jonathan
>>
-=-=-=-=-=-=-=-=-
Bruce Lane, Owner and head honcho,
Blue Feather Technologies -- kyrrin (at) bluefeathertech [dot] com
Web: http://www.bluefeathertech.com
"...No matter how we may wish otherwise, our science can only describe an object,
event, or living thing in our own human terms. It cannot possibly define any of them..."
I have about 120 pounds of Solaris 2.3/4/5 and Oracle 7.0/1/2
documentation for whoever wants to pick it up in Santa Monica. Not
quite classic, I know, but otherwise, they're going in the recycle bin,
with my eight new unsolicited copies of the PacBell Yellow pages.
I have left several Commodore PET 8032's for trade for those
interested.
Regards,
Eliot
.
<Linear/mains frequency supplies normally have internal links (or if
<you're lucky an external switch) to select the voltage. AFAIK, DEC
<always used transformers that were big enough to work at 50Hz (and were
<fine on 60Hz as well, of course).
Th BA23 (and 123) PS is a really wide range unit. For 120 nominal,
the working range is like 85 to 140V and for the 230 nominal it's 180
to 260 or so.
<Ferroresonant supplies (RX01, RX02, some RK02/RK03 systems) are a pain.
<IIRC, there is no way to convert the 60Hz version for 50Hz mains short of
<a new transformer.
Fortunatly they are limited and the PS can be subbed out easily. the
induction motors used are also part of the problem.
<One other thing remains. Most PDP11s have what's called a 'line time
<clock' -- basically an interrupt every mains cycle. This is counted by
<the real time clock program in most OSes, and used to keep real time,
<etc. Of course if you move a machine from 60Hz to 50Hz power or vice
<versa, the real time clock will run slow/fast until you re-SYSGEN the OS
<for the appropriate frequency. This is not a big problem -- things still
<work -- though.
If your really bugged by it you can supply your own LTC derived from
other sources.
<So in your case. The PSU will be fine if you flip the switch. The machine
<should work (everything inside the box runs off the DC outputs of the PSU
<and doesn't care about frequency). The real time clock may run slow.
Also depends on the CPU board used as some use the TOY clock for LTC.
This does not include the 11/03, 11/23 series. The 11/73 series I can
only speak on the KDJ-11A I have and that uses a traditional LTC like the
11/23. Later ones may differ.
I cheat and synclock a 300hz osc to most submultiples 50/60hz then divide
by 5 to get 60hz. Trivial circuit, predictable result. Or take a crystal
and divide to 60hz (or 50 if thats what you need).
Allison
>One other thing remains. Most PDP11s have what's called a 'line time
>clock' -- basically an interrupt every mains cycle. This is counted by
>the real time clock program in most OSes, and used to keep real time,
>etc. Of course if you move a machine from 60Hz to 50Hz power or vice
>versa, the real time clock will run slow/fast until you re-SYSGEN the OS
>for the appropriate frequency.
On many of the operating systems, you don't have to do a SYSGEN - just
tweak a number in the configuration word and viola, it's now a 50Hz machine.
For an RT-11 machine, in particular, you can tweak this on a running
system if you wish:
.type 50hz.mac
.MCALL .PVAL, .EXIT
; RMON Fixed offsets
CONFIG = 300 ;Configuration word 1
CLK50$ = 000040 ;50-cycle system clock
HZ50: .PVAL #AREA,#CONFIG,#CLK50$,BIS ;Get configuration word
.EXIT
AREA: .BLKW 4
.END HZ50
.macro 50hz
.link 50hz
.show conf
RT-11FB V05.07
Booted from DU1:RT11FB
USR is set SWAP
EXIT is set SWAP
KMON is set NOIND
MODE is set NOSJ
TT is set NOQUIET
ERROR is set ERROR
SL is set OFF
EDIT is set KED
FORTRAN is set FORTRA
KMON nesting depth is 3
CLI is set DCL, CCL, UCL, NO UCF
PDP 11/84 Processor
2048KB of memory
Floating Point Microcode
Extended Instruction Set (EIS)
Memory Management Unit
ECC Memory
Cache Memory
PMI Memory
60 Hertz System Clock
FPU support
.run 50hz
.show conf
RT-11FB V05.07
Booted from DU1:RT11FB
USR is set SWAP
EXIT is set SWAP
KMON is set NOIND
MODE is set NOSJ
TT is set NOQUIET
ERROR is set ERROR
SL is set OFF
EDIT is set KED
FORTRAN is set FORTRA
KMON nesting depth is 3
CLI is set DCL, CCL, UCL, NO UCF
PDP 11/84 Processor
2048KB of memory
Floating Point Microcode
Extended Instruction Set (EIS)
Memory Management Unit
ECC Memory
Cache Memory
PMI Memory
50 Hertz System Clock
FPU support
--
Tim Shoppa Email: shoppa(a)trailing-edge.com
Trailing Edge Technology WWW: http://www.trailing-edge.com/
7328 Bradley Blvd Voice: 301-767-5917
Bethesda, MD, USA 20817 Fax: 301-767-5927
