Hi! Got two FDD200, 8" drives. I revised their config with the manual handy. They seem OK for my needs (reading soft sectored IBM disks) except for a thing. They are configured for radial selection but with dedicated SELECT lines for heads/side. The first disk responds to SELECT lines 0 and 2, respectively for HEAD 0 and 1. The second disk responds to SELECT lines 1 and 3, for HEAD 0 and 1. This can easily be reverted moving a soldered wire jumper. I'd like to know why they were configured that way. I'll use the FDADAP adapter, BTW. Thanks!
> From: Jacob Ritorto
> 2) Assuming H7681, do you know how to wire a chassis that expects H768
> to work with H7681? Or vice versa?
AFAIK, there is nothing to it.
The backplane normally used with the H786, the H9273, has exactly the same
kind of power connector as the one used with the H7861, the H9276 - a
terminal block. The pinout is, IIRC, identical. There's also a duPont
connector on a flat cable (10 or 12 pin, don't recall off the top of my
head), which carries BPOK and things like that, and that also is has an
identical pinout.
And finally they are the exact same size and shape, with the same fasteners
in the same locations.
Hence my prior assertion that "have looked at both closely, and verified that
they have the same interfaces and physical dimensions, etc, so I think this
will work, but I have yet to actually try it [to absolutely verify it]".
Although I've just noticed that the BA11-N (the H786/H9273) has an H403-A
AC control box, and the BA11-S (the H7861/H9276) has an H403-B. I don't know
what the difference is between the two: higher current rating, would be my
guess, since the H786 puts out 15A of +5V, whereas the H7861 can do 36A.
But no, the BA11-N says its max input is 12A at 120 VAC - although that
includes powering an auxilliary AC outlet. The H756 P/S alone draws 5.5A; the
H7561 is the exact same. (Wow, double the efficiency...) So the auxiliary
outlet must be the difference - sure enough, the BA11-S doesn't have one.
So I still think you're good to go! :-)
Noel
Does anyone have a description of the switch settings for a QBus MSV11-M
(aka MSV1M) memory card (M7506)?
I have one that doesn't want to play, and I can't find the manual
(EK-MSV1M-UG) or any useful notes anywhere.
--
Pete
Pete Turnbull
Hi all,
I recently picked up an HP 2640B (thanks, Josh!) and I'm restoring it. The
keyboard cable was cut - but the mainframe end was thrown away - but I
found a printer cable that uses the same connector, and I don't have a
printer adapter for it. It has bad screen mold, but I have A Plan - I'm
going to try soaking the face of the CRT face-down in acetone, to see if it
will dissolve/loosen the offending adhesive.
It's also missing the badge plate: that part behind the keyboard and below
the screen that has the HP logo and the terminal name. Is there a chance
anyone out there has a parts-beast 2640B and would part with that badge
plate? In the alternative, maybe take some really good photos so I can
have one of my friends with a 3D printer make the badge bits, which I can
fasten to something Close Enough for Folk Music?
I plan to hook this up to my HP-1000 - I also picked up a HP-IB cable so I
can connect the -1000 to a (real) floppy or (emulated) hard disk. Fun
stuff! -- Ian
PS: I'll be at VCF/e next week.
--
Ian S. King, MSIS, MSCS, Ph.D. Candidate
The Information School <http://ischool.uw.edu>
Archivist, Voices From the Rwanda Tribunal <http://tribunalvoices.org>
Value Sensitive Design Research Lab <http://vsdesign.org>
University of Washington
There is an old Vulcan saying: "Only Nixon could go to China."
Hello,
I am in the process of moving and need to pare down my spare parts
collection. I have several BA23 chassis with power supplies.
I do not know the condition as they have been stored in my shed for
years. They do not include modules or outer shells.
If you pickup in Lexington KY, they are free.
Thanks
Max
Hello,
apart from the transistors, I would check for some bad capacitor.
The analog part with the sensors needs quite clean supply to work good,
while the motor itself is a big source of spikes and pulses.
Possibly there could be some supply filter, with electrolytic capacitors
not working as expected due to age... or with excessive current leakage.
Andrea
Hi,
I have a Sun 19" monochrome Model M monitor to give away. I have no idea if
it works - it made a fizzing noise upon applying briefly applying power so
probably needs at least some work. I used to use it on a 3/60 which I no
longer have.
Made in USA
SvCd: M01
Part#: 365-1014-01
Model: M
Ser: 848F1051
Date: 29-nov-88
ElecRatings:
100-120/200-240ACV
50/60Hz 1.6/1.0A
I have a couple of photos if anyone's interested.
Free of charge. Collection only, from Sutton, south-west London, UK.
It'll be off to the dump on Saturday if no interest by then.
Pete.
> From: Cory Heisterkamp
> If someone has one for sale (this one marked H7861), please let me
> know.
Someone on eBay is selling one:
http://www.ebay.com/itm/150947900783
They are asking $125, which is not wholly ridiculous, and will probably take
slightly less. I've bought several from this seller, and they are in good
shape.
Also, at a pinch, I'm pretty sure (as in, I have looked at both closely, and
verified that they have the same interfaces and physical dimensions, etc, so I
think this will work, but I have yet to actually try it) an H786 would also
work in that system. The only difference I know of is that the H7861 puts out
a few more amps of +5V. No reasonably priced H786's on eBay at the moment,
though.
> It looks serviceable and is likely repairable by an expert so that
> could be an option, too.
I'd interested in buying the dead one from you (which should help offset the
cost if you go for the eBay one) - please contact me off line if interested.
Noel
I need another operational HP 7970E mag tape controller (13183 - 2 board
set). It appears that the spare board sets I have are 13181 which I believe
is only for the 7970A/B. All my drives are 7970E, so is there any chance
someone has a 7970A/B but has a 13183 and would like to swap my 13181 for
it? J Or if anyone has a spare 13183 they want to sell/trade...
Best,
J
OK, I think all of them have been claimed now. If not I will report. Now
to see what else is in the shed.
thanks
------------------------------ Message: 16 Date: Mon, 6 Apr 2015
11:06:31 -0400 From: Jacob Ritorto <jacob.ritorto at gmail.com> To:
"General Discussion: On-Topic Posts" <cctech at classiccmp.org> Subject:
Re: BA23 Chassis available in Lexington KY Message-ID:
<CAHYQbfBp7WuiR5qSfeR39tDMBQKGHvg2Vk8vw5FGgewSOjBzug at mail.gmail.com>
Content-Type: text/plain; charset=UTF-8 Hey Max, I'll take a couple.
You're a six-hour's drive from me, so it'll take me a sec to figure out
when. How's Friday for you? On Sun, Apr 5, 2015 at 6:47 PM,
<keith at saracom.com> wrote:
>> Hello, I am in the process of moving and need to pare down my spare parts collection. I have several BA23 chassis with power supplies. I do not know the condition as they have been stored in my shed for years. They do not include modules or outer shells. If you pickup in Lexington KY, they are free. Thanks Max
> ************************************
