The Bernoulli drives I have are all more or less the same, irrespective of
their generation. The PC interface card.cable uses a 37-pin (DC37) sub-D
connector and that's essentially a SCSI cable with the unused conductors
omitted. This makes for fewer conductors in the cable, but, if you look
inside the drive, the attachment to the controller is via a 50-conductor
ribbon cable, an adapter to which is attached to the bulkead at the rear of
the box. The interconnections between the drives are 50-conductor ribbon,
and, depending on the generation of the hardware, but for most of the 10 MB
8" drives, the controller is generally a separate card to which the drives
attached. It is more or less standard SCSI, though it doesn't work well
with other adapters or with ASPI drivers under DOS. I doubt the MAC uses
different internal hardware or cabling, though the BERNOULLI drives hung on
for a longer time in the MAC environment because of the MAC's smaller size
requirement. I have an old Xebec drive which uses precisely the same
cabling arrangement as the various BERNOULLI systems I have, and it also is
terminated at the drive/controller end in a 50-pin cable from its external
37-pin version. One of the BERNOULLI arrangements I have came with an
adapter to the more or less standard Amphenol (looks like a big Centronics)
50-conductor "Blue-Ribbon" connectors. This works because the controller
board on the Bernoulli's controller has soldered-in terminations.
I'd speculate that if you open a box and attach a typical SCSI-1
device-attachment cable not necesarily with both of the female connectors
attached, it will work with standard SCSI cabling. You'll have to make/buy
whatever the necesssary adapter from your MAC to the "SCSI-1" cable happens
to be, however.
Dick
-----Original Message-----
From: Bill Pechter <pechter(a)pechter.dyndns.org>
To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org>
Date: Tuesday, March 21, 2000 7:45 AM
Subject: Re: Mac to Bernoulli Cable
>> > I am looking for a cable to attach a Mac SE (DB25?) to an 8"
>> >Bernoulli Drive (Amphenol?) John Sowden
>>
>> Chances are I have it, but I don't know what it is. The SE SCSI port is
>> DB25F (so the cable is DB25M), explain the other connector in more
detail.
>> The three common ends are;
>>
>> DB25M, most older mac SCSI devices.
>> Centrontics50M, most SCSI devices.
>> HD (high density) C50M, compaq and some sony.
>>
>
>Anyone know anything about Centronics to DB50 pin typecables having
problems
>with termination or termpower on Suns...
>
>Was there multiple versions of the 50 pin pinout in the early days.
>
>Symptoms -- hung scsi bus on Sparcstations... inability to probe SCSI
>when used.
>
>Bill
>>With all this talk of PDP11/23's I am looking at my BA23 with I think an
>>11/73 CPU inside it.
>>I haven't powered it up because it is set for 110v and we have 230v here.
>>There's a switch on the back but a big sticker on the PS itself says to
>>refer to the operating manual . . . sort of like there must be other
>>things to do also.
>I would be very surprised if there was anything else to do but to toggle
>the power supply to 220 volt. The switch will also change for your 50hz
>cycle.
There isn't anything to change inside the power supply for 50Hz vs 60Hz.
All your software should be built or set to expect a 50 Hz line clock, too,
of course... (unless you like having your clock run at 5/6ths run
at actual speed!)
--
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
With all this talk of PDP11/23's I am looking at my BA23 with I think an
11/73 CPU inside it.
I haven't powered it up because it is set for 110v and we have 230v here.
There's a switch on the back but a big sticker on the PS itself says to
refer to the operating manual . . . sort of like there must be other things
to do also.
Does anyone here know about these things?
Thanks,
Hans
Does anybody know if IBM still prints up copies of their famous (infamous?)
corporate songbook? Furthermore, can anybody buy one. That is someting I
want to do: Buy a IBM Corporate Songbook, & go to a *Macintosh Expo*, & bust
out singing! (I know, I'm sadistic. Thank you. I've worked very hard to
become so!)
____________________________________________________________
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
>Anyway, the machine works. I would like to format some floppies and get a
>restorable backup of the drive. The two floppies respond to DIR/Bad, and
>Init/Bad as devices DU1 and DU2:. But I get 'bad sector in system area'
>when I try to init. How do I low-level floppies?
Are your floppy drives RX33's or RX50's?
A RX50 is a two-drive-in-one unit, grey faceplate, two orange marks
showing you how to insert the bottom floppy in upside down. You can't
format a RX50 on your RQDX controller, you have to do it elsewhere. PUTR is
a common choice on a PC, get it at ftp.dbit.com.
A RX33 is a TEAC 5.25" HD disk drive. Put a 1.2Mbyte disk in, tell
it "FORMAT DU1:", and you'll have it formatted as a RX33. A RX33
can also read/write RX50's, but it can't format them on a DEC RQDX
controller.
Note that there are third-party Q-bus controllers that let you format RX50's,
and if you're running RT-11 5.7 you can use FORMAT/SINGLE on these
controllers to make RX50's.
--
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
>OK, I got a 6.4 GB laptop drive hooked up and right now the iOpener is
>running DOS/BATCH V10-01A on an emulated PDP-11/40+RK05 system. I love
>it!!!
>It's going to take some real butchery to get the case closed, but I guess
>that's to be expected. The low-profile 3M connector barely fit under the
>CPU heat sink w/o needing it to be clearanced, that was nice.
>BTW the CPU seems to be 200 MHz, not 180 MHz. But it still gets only
>about 80 BogoMIPS, pretty slow.
I heard last night that Netpliance is making modifications so that people
can no longer do this... they are apparently losing a LOT of money selling
the machines, having expected to recoup it in the service charges...
Can someone confirm this... and maybe confirm the change that they
have done (which I understand is simply removal of the cable connector
for the drive).
Oh, and supposedly back-ordered units will have the mod...
Megan Gentry
Former RT-11 Developer
+--------------------------------+-------------------------------------+
| Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry!zk3.dec.com |
| Unix Support Engineering Group | (home): mbg!world.std.com |
| Compaq Computer Corporation | addresses need '@' in place of '!' |
| 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ |
| Nashua, NH 03062 | "pdp-11 programmer - some assembler |
| (603) 884 1055 | required." - mbg |
+--------------------------------+-------------------------------------+
On Mar 24, 18:42, Tony Duell wrote:
> > White (A) output to printer
> > Red (B) input for PX1000 and power
> > Screen (C) mass
> ^^^^
> Most likely to be 'ground', based on the fact that it's the screen, and
> that I've seen words like 'Masse', 'Massa', etc in foreign manuals for
> the ground/0V connection.
Yes, it does mean "ground". I translated it with a little help from a
colleague (thanks, Karsten!) but Wim beat me to it...
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
I also had problems with a IBM 0661 disk. I was unable to get it to 512
byte sectors from 524/sector using either RZDISK (VMS) or TEST 75 on my
3100-M76.
I was able to format it on my RS/6000-220 using the diag program's service
aids/disk media service aid/format disk option in AIX.
Although there were no command parameters and no information from AIX on
what is was doing, when it was done the disk was reformatted to 512 bytes
and I was able to use the disk on the VAX and later make a spare bootable
unix system disk on my DEC mips machine.
Perhaps the IBM format also turned off the "target initiated sync
negotiation" for AIX in the saved config code page in the drive.
Paul
On Mon, 20 Mar 2000 jkunz(a)unixag-kl.fh-kl.de wrote:
> > Run the PROM based formatter on the drive using "TEST 75" to the
> monitor. I never did this and had no problems connecting various disks
> from Fujitsu, Seagate, Quantum, IBM (including a 1,8GB 0664), ... to a
> VS3100m76. The only problematic disk I found is the IBM 0661. This
> disk is knowen to be problematic due to the SCSI implementation of the
> firmeware of the disk. (e.g. target initiated sync negotiation) --
TU58 emulator on a PC, connected to a serial line of a real PDP11
Wim Hofman
----------
> From: healyzh(a)aracnet.com
> To: classiccmp(a)classiccmp.org
> Subject: Re: PDP-11/23 deskside machine -DAMN
> Date: Friday, March 24, 2000 12:21 PM
>
> I just realized something. Is this a PDP-11 emulator, or are you using a
PC
> to emulate a TU58 drive? I just realized you're probably talking about a
> TU58 emulator.
>
> Zane
>
>
> > The program was distributed by the author (Sytze Zijlstra) at the PDP11
Sig
> > Decus Holland. It is very easy to use and works well.
> >
> > Wim Hofman
> >
> > ----------
> > > From: healyzh(a)aracnet.com
> > > To: classiccmp(a)classiccmp.org
> > > Subject: Re: PDP-11/23 deskside machine -DAMN
> > > Date: Friday, March 24, 2000 8:27 AM
> > >
> > > > I boot a XXDP+ disk image from an emulated TU-58 on a PC running
the
> > > > emulator program from Sytze Zijlstra This emulator is also very
useful
> > to
> > > > transport data between PC and PDP-11.
> > > >
> > > > Wim Hofman
> > >
> > > What emulator program? I don't believe I've heard of this one.
> > >
> > > Zane
> >
>
<Well, the word from Netpliance is that they've locked out the ability to
<modify them. It looks like this is at least in part in the form of the
<following blurb, "Modification of the i-opener in any way is in violation o
<our terms and conditions". To which my answer is, sorry I don't buy that.
Same here since is was changed to say "against the terms and conditions".
To say the other is patently stupid.
<My guess is they made one of two changes, either the OS is better locked
<down, they removed the Hard Drive connector, or both. Of course it's also
<been theorized they did something nasty to the BIOS, that seems unlikely
<to me, but unfortunatly is possible.
Well the bios is AMI 4.51 and that easy to get, the connector is no big
deal and is the flash was converted to plain rom the introduction of an
IDE device defeats it. In fact from reports the interoduction of TWO
IDE devices elimintes it.
The rumor mongers have to do better.
I really want dos/MYZ80 running on one.
Allison
