All, I received this request from Matthew who isn't subscribed to either
the TUHS or cctalk lists. He knows how to read the lists archives. Many
thanks for any help you can provide.
Cheers, Warren
----- Forwarded message from Matthew Whitehead -----
Date: Mon, 15 Oct 2018 08:25:39 -0400
From: Matthew Whitehead
Subject: Ultrix Tape Blocks
Warren,
I wonder if you can give me a referral. I want to install Ultrix-32
on my MicroVAX II using the ancient TK-50 tape drive. I know the tape
files are on your archive, but I need to know the block size for each
of the many files; it can vary a lot.
Who might be able to help me with this?
Matthew Whitehead
----- End forwarded message -----
> From: Bill Gunshannon
>> From: Jerry Weiss
>> Note: Apparently the RY emulation won't load if more than 256K memory
>> is specified ... I'm entirely not sure why SIMH has to enforce this
>> as its possible to work around .. Anyone know how to override and load
>> in SIMH?
> If it didn't it wouldn't be emulating real PDP-11 hardware. ...
> RX02 systems and they do not work with more than 256K.
Right, the hardware only has 18 bits of 'buffer address' (in both UNIBUS and
QBUS versions). But one can still plug one into a QBUS system with more than
256KB, and use it - you just can't use memory above 256KB for transfers
to/from the RX02, since it cannot physically create those addresses.
If sounds from Jerry's description as if SIMH refuses to emulate an RX02 if
the emulated system is configured with more than 256KB - which would be a
bug, if so.
Noel
Josh -
You may want to contact Denis Kohlhagen, at Butler Winding. IF this is for the preservation of an HP terminal in the museum, they may wish to assist in rebuild/rewinding that flyback. There are US firms that can perform this work, and publicity of preserving history is desired by some corporate marketing dept.
Butler Winding
7426A Tanner Parkway; Arcade, NY 14009 USA
http://www.butlerwinding.com/
Phone: 1-716-532-2234
Fax: 1-716-523-2702
==
?I poked around a bit more this morning and it's looking like part of the flyback is shorted out -- we have a 2382 at the museum and I popped it open just now and I verified that it measures differently (i.e "not shorted" :)) at the same points. So that's likely my problem. Drat.
- Josh?
Sent from iPad Air
I know some of our members are into phones...
I am tossing the following in a skip to go to a recycler. I'd rather not
ship the units, but am willing to pull any boards if someone needs them.
Toshiba Strata DX
Toshiba CIX200
Toshiba CIX40
The will be sent off to recycler Monday or Tuesday.
J
> From: Guy Dunphy
> The mechanics has no adjustment or spring tension on the pinch roller
> positions. ... all the spring is in the rubber of the rollers.
> But how much squish?
> ...
> I'm hoping someone might have some knowledge of how much punch card
> reader pinch rollers should press against capstans. Does 0.2mm squish
> seem right
To produce a given force on the card, the dimensional amount of squish needed
would depend on the rigidity of the material, no? A stiff material would
need/want less than something soft, I would think.
Noel
Does anyone have the user, technical and/or service manual for the original
10MB Iomega Bernoulli drives? Bitsavers has the manuals for the later
half-height 10.0/10.5 MB "Alpha-10H", but I'm looking for docs for the
original model, which was full-height with a SASI (pre-SCSI) interface.
I have the drives, about 20 cartridges that I want to image, and some
additional scratch cartridges.
I've never used Bernoulli drives before. These drives and cartridges were
last used around 1986. I'll disconnect and test the power supply before
powering up the actual drives, but is there anything else I should be
concerned with?
Does anyone have known-working 8-inch Bernoulli drives?
On 10/15/18 1:00 PM, cctech-request at classiccmp.org wrote:
> From: Michael Brutman <mbbrutman at brutman.com>
>
> Hi Eric,
>
> I have working 10MB and 20MB units here being driven by a PC XT with the
> Iomega specific card for them.
>
> I've had to puts lots of effort into cleaning the heads on them. I'm not
> sure if there is an oxide shedding problem or just 30 years of dust that
> I'm fighting, but they do seem to be very finicky at this stage. It also
> could be a media formatting problem; I think they have servo tracks that
> were laid down at manufacturing time, so if you have a read error on the
> servo track there is no way to fix it.
>
>
> Mike
I've got a collection of 1/2 height 8" drives, and one among them (a 20
MB unit) is able to come online with a cartridge inserted. Maybe head
cleaning is what is troubling the others - but I have no idea how I'd
jam a cotton swab in there and find the heads to attempt a cleaning.
I have a Bernoulli card in a PC that will lift the bits from
DOS-formatted cartridges, and I hook the drive up to an old Mac with a
SCSI card in it to image other arbitrary types (I've seen them used as
audio recording devices as well as external storage for HP equipment).
- David
Folks,
Yay, I was wrong! The IC seems to be OK, the issue was a stuck-on kb
switch. A quirk of the Apple design causes the last-pressed key to repeat
continuously if any key is being held 'on'.
That leaves me needing two kb switches and possibly one 'tilde' key. This
is the beige IIe kb with small black print.
Thanks for the space,
Bill