10 Jul
2002
10 Jul
'02
5:10 a.m.
From: "Bill Bradford"
<mrbill(a)mrbill.net>
Lastt call on the following parts, or they will probably end up at Goodwill
ComputerWorks or in a box in the back corner of my garage:
Sun VME boards:
http://www.mrbill.net/~mrbill/freestuff/
Heath H11 dual-8" floppy drive:
http://www.pdp11.org/pics/parts/thumbs/eight-inch-floppys-front.jpg.html
http://www.pdp11.org/pics/parts/thumbs/eight-inch-floppys-switches.jpg.html
http://www.pdp11.org/pics/parts/thumbs/floppys-zenith-logo.jpg.html
I've also got a SPARCstation 10 chassis and a SPARCstation 20 chassis
(both with power supply, motherboard, and case - you'll need CPU/RAM/HDs
to get them operational). I need these out of the way as well.
Free for pickup in Austin, TX. Contact me if interested.
Bill
--
Bill Bradford
mrbill(a)mrbill.net
Austin, TX
Hi Bill
I would vary much like to have the H11 floppy ( actually to use
on my MDS-800, Intel developement system ). I don't think the drives
care what machine I use. Anyway, I'm in California but I have friends
in Austin. Can you let me know your address and I'll contact
someone there that should be able to pick up the drives.
Dwight
10 Jul
10 Jul
5:36 a.m.
New subject: H-11/H-27 (was Re: LAST CALL: Free Parts/Stuff in Austin, TX)
--- "Dwight K. Elvey" <dwightk.elvey(a)amd.com> wrote:
http://www.pdp11.org/pics/parts/thumbs/eight-inch-floppys-switches.jpg.html
Hi Bill
I would vary much like to have the H11 floppy ( actually to use
on my MDS-800, Intel developement system ). I don't think the drives
care what machine I use.
I forget what the drives are inside the box, but just keep in mind that
the H-27 (the drive sub-system for the H-11) is an intellegent drive
that talks to the Qbus through a 40-pin cable that is its own standard.
The RX01 is also a (semi-)intellegent drive on a 40-pin cable, but they
are not cross-compatible from a cable/drive/controller standpoint.
They _are_ compatible at the controller register/device driver level.
I suspect you need a raw 50-pin SA800-style interface for your Intel
MDS-800. You could probably use the H-27 case and PSU if you bypass
the controller board inside the H-27. I suspect you could probably
pull the drives (if they are physically and electrically compatible)
and drop them into the MDS-800, presuming it doesn't have its own
external arrangement for its drives (not sure; never seen one, only
heard of them).
If you do get the H-27 and you don't need bits and pieces of it (like
the enclosure or PSU or internal controller), let me know. I have
a working H-11 and a working H-27 box with a not-totally-working Qbus
controller card (problems with the interrupts*). I would like to have
spare parts.
-ethan
* I have consulted some scans of docs from people and I've been unable
to deduce what's wrong. At the moment, I think I need to learn what
the purpose of the configuration jumpers are and get them set right.
The previous owner cut and rejumped them a couple of times and I don't
know that they are correct. The board is all sockted ICs and I have
run each TTL chip through an IC tester. The Nat'l Semi bus drivers
and receivers can't be tested that way, so I have analyzed the schematics
to figure out which 8837 or whatever else is related to the interrupt
chain, but with no positive results as of yet. I don't need to format
and blank media, so I can get along with a real DEC RX01/RX02 and a
real RXV11/RXV21, but I'd like to be able to use the H-27 with the H-11
since that's what it goes with and it should all work.
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5:50 a.m.
New subject: H-11/H-27 (was Re: LAST CALL: Free Parts/Stuff in Austin, TX)
At 10:34 AM 7/10/02 -0700, Ethan Dicks wrote:
--- "Dwight K. Elvey"
<dwightk.elvey(a)amd.com> wrote:
> Hi Bill
> I would vary much like to have the H11 floppy ( actually to use
> on my MDS-800, Intel developement system ). I don't think the drives
> care what machine I use.
[...]
You could probably use the H-27 case and PSU if you
bypass
the controller board inside the H-27. I suspect you could probably
pull the drives (if they are physically and electrically compatible)
and drop them into the MDS-800, presuming it doesn't have its own
external arrangement for its drives (not sure; never seen one, only
heard of them).
If you do get the H-27 and you don't need bits and pieces of it (like
the enclosure or PSU or internal controller), let me know. I have
a working H-11 and a working H-27 box with a not-totally-working Qbus
controller card (problems with the interrupts*). I would like to have
spare parts.
This is painful to read.
I also have an H-11 with a partially working paper tape punch and have
been looking for the floppy drive subsystem. If it's at all possible I'd like
to keep the H-27 intact, even if it ends up with Ethan.
I have several eight-inch floppy drives along with a Cromemco system
if you need floppy drives, but I'd hate to see the Heath subsystem pulled
apart just for the drives.
Cheers,
Dan
8206
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8206
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2 comments
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participants (3)
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dan＠ekoan.com -
dwightk.elvey＠amd.com -
erd_6502＠yahoo.com