Tony Duell <ard(a)p850ug1.demon.co.uk> writes:
> [IEEE488/centronics/whatever connectors]
> >From the HP-97S user manual (I have one on loan for a demonstration in a
> few weeks...)
>
> 'Your peripheral device is connected to the HP-97S interface with a
> standard 25-pair telephone connector (Amphenol 57-30500 or equivalent)'
Ah. Yes, we used to call the 50-pin version a telephone or telco
connector because, well, that's where we used to find most of them:
going to a 5-line office phone, or on the side of a punch-block.
But HP-IB and Centronics printer connectors didn't have enough pins to
be called telco connectors. Besides, HP-IB used bigger, stackable
screws, and Centronics printer connectors had those ears. It wasn't
'til I saw the 50-pin Centronicsish SCSI connector that I started to
get confused.
-Frank McConnell
Since no-one seems to have answered this, I shall put my bit in. I am no
PDP expert, though.
> After all the discussion here recently about collecting PDP11's I have
> located one which I intend negotiating for. I haven't actually seen it yet.
>
> It is a PDP11/15, a model number that I haven't seem mentioned. Is there a
> listing somewhere on the web that describes the various models as there is
> for PDP8's ?
The 11/15 and 11/20 were two variants of the original PDP11 CPU, which
came out in 1970 (I think). The processor itself may have been called
the KA11, but I am not sure of this. The difference between them was
system configuration, AFAIK.
> This one apparently dates from about 1970, and is probably incomplete.
> There was talk of a rack, the PDP11/15 itself, some RKO5 disk drives and
> some boxes labelled PDP11/10 which may be other computers. There is no
> other IO device other than front panel switches.
PDP 11/10 is usually an 11/05 variant (again the difference is
configuration of the system), dating from c. 1974 (and full of TTL -
74XX device codes and 74XX date codes can be very confusing). But I
have heard rumours of an 11/15 variant of that name. No doubt Allison,
Tim or Tony will tell you all about this. One day I shall get my 11/10
working...
> Could this equipment be used with a more recent terminal? I have no chance
> of finding a card reader or teletype but have access to several VT220's.
AFAIK it will require a current loop interface. Some quite late
terminals had this feature - I use something called a Westward Graphics
Terminal.
Philip.
> Tony Duell <ard(a)odin.phy.bris.ac.uk> said:
>5.25" and 3.5" alignment disks are still available (but expect to pay $100
>a time...). I can't find 3" (Amstrad, etc) or 8" alignment disks anywhere,
>alas...
I don't know if anyone's responded to this yet. (I'm behind in my mail again).
But you might try Accurite Technologies Inc. here in the bay area.
They're at http://www.accurite.com
When I talked to them about a year ago, they said they believe that
they are the only ones in the world still making 8" alignment disks.
They sell both 8" analog alignment diskettes and 8" digital diagnostic
diskettes.
Don't quote me on this but, I seem to remember them saying that the
8" diskettes were $65 each.
=========================================
Doug Coward dcoward(a)pressstart.com
Senior Software Engineer
Press Start Inc.
Sunnyvale,CA
=========================================
Ha! Got it! The drive READY light had one of the little posts broken
off, that's why it never booted! It was drive 1!
But I have to wait till I'm off the clock & my boss leaves before I can
test the theory...
<> > Switch 1-2 tells it (both PC and XT) about the presence of the coproces
<> > (I do, btw, have an 8087 in my collection...only one I've ever seen! Ev
<> > rarer was the 8088 to 386 SX-16 upgrade board...the world's s-l-o-w-e-s
<> > 386.)
<>
<> K00L. How long does it take to install Linux using that? :-)}
I have an xt class machine with an inboard386 and linux is not possible
as it only has 1meg of ram and the expansion is off the inboard.
FYI the inboard386 was an 386SX/16 compared the the v20 at 4.77mhz it's
fast!
Allison
Here's something from our friend Mike. Please send all replies to him.
Sam
-------------------------------------------------------------------------------
Computer Historian, Programmer, Musician, Philosopher, Athlete, Writer, Jackass
---------- Forwarded message ----------
Date: Fri, 22 Aug 1997 10:25:30 -0400 (EDT)
From: Mikeooo1(a)aol.com
To: dastar(a)crl.com
Subject: hhc eproms
Sam,
I didn't hear from you before so can you let me know if there is going to
be any need for HHC eproms? I am sitting on approx. 5000 of them which I have
received a salvage offer of $1.25/lb for and I'm probably going to take,but I
don't want to put anyone in a position where they are requested but now not
available like before with the HHC's.So I would appreciate you letting me
know.
Thanks Mike
>
> > For Switch #1:
> > For Switch #2 (some obscure combos not typed in)
>
> It seems to me that one of the sacred switches will put the machine into
> an endless loop of reboots - just after the self tests, etc., the machine
> would boot again.
>
> I did not know about this, and had a machine that had this "problem". A
> trip to the library solved it.
You guys may be talking about Switch 1-1 -- which, for an XT, will do this.
Switch 1-2 tells it (both PC and XT) about the presence of the coprocessor.
(I do, btw, have an 8087 in my collection...only one I've ever seen! Even
rarer was the 8088 to 386 SX-16 upgrade board...the world's s-l-o-w-e-s-t
386.)
I'd like to add an 8086 motherboard to my collection...anyone have one?
Well, today I decided to repair the power supply on the Percom floppy that I have for my pair of Model I's. Then, I decided to see if a complete keyboard-EI-floppy setup worked. Therein lies the problem...
It seems like each CPU (a 4k and a 16k Level II) won't recognize either EI (a Rev 0 and Rev 1). Both EI's have 32k of RAM. All that I get on the screen is garbage. I'm turing the EI on first, then the CPU. I've also tried two types of EI cables, one buffered and one not. I can tell which cable goes to which EI because the floppy drive will initialize only with the right combo.
It sounds like I have two bad EI's, but the thing that throws me is that the floppy interface performs a floppy reset.
Does anyone have any clue?? Also, how does one refer to the floppy drive in a BASIC statement? For example, if I want to load a program, do I type LOAD "0:test.bas"? I have no manuals for these machines, and it's been a loooong time since I used one of these.
Also, on an unrelated note, the Altair scans are in, but I'm waiting for Bill Whitson's address so that I can Fedex a tape to him. Does anyone have it??
Rich Cini/WUGNET
<rcini(a)msn.com>
If any of you have need of a very decent 525 MB SCSI tape drive, check
with this fellow. This is an excellent price for what he describes, though
he does not appear to be aware that DC6525 tapes exist. ;-)
-=-=- <snip> -=-=-
I have the following for sale:
Archive Viper 2525 25583 Rev 002 SCSI tape backup units. Comes in
external
enclosure with Unisys Tape Streamer marked on it. Uses DC-6150 (150 MB
uncompressed) and DC-6250 (250 MB uncompressed) tapes. Tested with
Novastor Tape Backup and Cheyenne Tape Backup and Seagate Backup Exec.
Novastor has software compression to double capacity. Works great. The
unit has a SCSI selector switch and two large 50 pin SCSI connectors on
back of unit. $50 + shipping.
Thanks,
James (jevans2(a)sisna.com)
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
UNSOLICITED COMMERCIAL E-MAIL SUBJECT TO $500.00 PROOFREADING FEE PER ITEM SENT.
SENDING ME SUCH UNSOLICITED ITEMS CONSTITUTES UNDERSTANDING AND ACCEPTANCE OF THESE TERMS.
Bruce Lane, Sysop, The Dragon's Cave (Fido 1:343/272)
http://www.wizards.net/technoid
"...Spam is bad. Spam wastes resources. Spam is theft of service. Don't spam, period..."
Is the 7-pin power connector on certain VIC-20's the same as the power supply
on the C64?? I just got a couple VIC's of this type with no power supplies.
TIA!
+============================================+
| Rich Cini/WUGNET
| <rcini(a)msn.com>
+============================================+
