HP 3.5 discs I wonder if in the HP 150 manual?
Back when we sold the things .... I still have a maint manual for the
150... offlist mail me if you still have questions and I will dig it up.
Ed Sharpe archivist for SMECC www.smecc.org
In a message dated 2/1/2013 10:25:55 A.M. Mountain Standard Time,
cctalk-request at classiccmp.org writes:
Message: 5
Date: Thu, 31 Jan 2013 21:50:14 +0000 (GMT)
From: ard at p850ug1.demon.co.uk (Tony Duell)
To: cctalk at classiccmp.org
Subject: Re: Looking for Appendix to HP 3.5" disc drive service manual
(disc commands)
Message-ID: <m1U121T-000J4cC at p850ug1>
Content-Type: text/plain
> I was interested to read about the differences between the 9121 and
> 82901 commands, eg the 9121 supports a superset of the 82901 commands
> and so should be fully backwards compatible. One difference I have noted
I beleive it was specifically designed to be. It was intended that any
systme that supported the 82901 could also use the 9121, no matter waht
assumptions it made. In this repsect, the respose to the standard
idenmtification coammends is the same, there is one extended command that
returns a differnet value o nthe 2 drives so it is possible to tell them
apart, but a ssytsem designed fo the 82901 wouldn't use that command.
Also the total numebr of sectors per disk is the same -- IIRC the 82901
is double-sided 35 cylidner and the 9121 is single sided 70 cylinder.
-tony
------------------------------
On Thu, Jan 31, 2013 10:38 PM PST Jerry Wright wrote:
>Anyone have a stash of either card. Have a few
>micro vax machines that are missing the M7555
>and I need a couple of the M8061's for my micro
>PDP11's
>
>Also could use a 7140 Power supply or boards.
>seems like every few years one of my 11/24or44's
>machines has PS problems.
>
>
> Thanks, Jerry
>
I don't have a clue what you're looking for, but I have a MVax parts machine. Maybe that has what you're looking for...
On Feb 1, 2013, at 12:00 PM, cctalk-request at classiccmp.org wrote:
> From: Pete Turnbull <pete at dunnington.plus.com>
> To: General Discussion: On-Topic and Off-Topic Posts
> <cctalk at classiccmp.org>
> Subject: Re:
> Message-ID: <510AD86B.8020007 at dunnington.plus.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> On 31/01/2013 05:37, Charles wrote:
>> Anyhow, I figure that the OS/8 pack might have become corrupted, so I
>> attempted to reload it on my 11/23+ system (which IS working and
>> passing
>> memory tests) using VTserver, which is how I created it the first
>> time.
>> However, since I last successfully did it, I've upgraded the 11/23+
>> boot
>> ROMs to the KDF11B-BH V1.0. This is the only hardware change. Not
>> sure
>> if that has anything to do with the problem
>
>> Do I need to go back to the original boot ROM in order to use
>> VTserver
>> (i.e. is there some change made to ODT that is messing things up?)
>
> The boot ROMs have no bearing on ODT, which is in the microcode in the
> KDF11 itself. So you can eliminate at least one area of concern.
> What
> boot ROMs did you have before? Were they 2K ones (11/23+) or 8K ones
> (microPDP-11/23)? Have you changed any jumpers during the upgrade?
>
> --
> Pete
The original ones (-339, -340) are 2716 EPROMs (2k). The only jumper
changed was the J23-24 which the manual says to set for 8K proms, and
J23-22 for 2k.
I put the old ones back in (and set the jumper accordingly) and the
transfer proceeded normally. For whatever reason the new ones do not
like VTserver.
Incidentally, the problem with the 8/A & RL02 turned out to be simply
a bad ribbon cable connection (my fault) where the IDC connector plugs
into the RL8A card.
The previous OS/8 pack boots and runs normally too... now I can get
back to playing Lunar Lander in FOCAL on the Teletype, and ADVENT :)
-Charles
Steven Hirsch <snhirsch at gmail.com> wrote ..
> On Wed, 30 Jan 2013, mc68010 wrote:
>
> > I can't believe how crazy the Apple thing has got. One of Sellam's Apple II
> > just sold for almost $4k. Wow.
>
> Rev. 0 Apple ][s with low serial numbers are being sought after. Another
> unit went for > $5k the other week, but the buyer apparently reneged. If
> that was one of Sellam's, it's all the more ammunition for his legal
> action.
>
> I can accept that there may be cases where a landlord can auction items
> left on premises under a default, but I'm not aware of any situation where
> they are allowed to blindly profit from the action.
>
> Steve
>
>
> --
It's not just an Apple thing. A TI-99/8 just went for $3240 on Ebay. It seems this was the second one over $3000 in the last 6 mos., so apparently it's not a fluke. Prices on vintage stuff generally seem to be on an up-cycle, apparently unlike the value of the time and labor spent assembling and protecting collections of historical, cultural, or economic significance. Tell it to the vandals in Timbuktu, maybe.
I'm just catching up on the list after being too busy to read it the last couple of months, and I'm still digesting Sellam's situation. Been through some similar circumstances, myself, and on the other hand, I do some work for an asset management co. that handles a lot of rentals, and to my intense dislike, property left behind after sadly , no matter what you do, with owners breathing down your neck, the inevitable evictions, property we go out of the way to have the tenant come get. But they don't. Much less pay the back rent. So maybe I have a somewhat unique perspective on the matter. I'm not sure, however, that I could remain either temperate or coherent about it, so I'm going to refrain from comment just now. I can tell, though, when failure to pay rent on a timely basis is a thinly veiled pretext for theft. Good luck, Sellam.
jbdigriz
>
> I'm having intermittent problems with my Superpet. It will run fine for some
> time, but then will "glitch" for a couple of seconds (including video
> distortion), and then hang.
>
> Having done a bit of digging, I suspect that the flyback transformer is
> arcing internally. The video board is the one in this schematic
> (http://zimmers.net/anonftp/pub/cbm/s...032/321448.gif).
>
The link is mangled. I think it should be:
http://zimmers.net/anonftp/pub/cbm/schematics/computers/pet/8032/321448.gif
>
> I can hear the arcing sound from area of the transformer when the glitch
> occurs, and I see no obvious external indications of anything sparking or
> shorting. I have looked at the voltages at the various test points noted
> on the video board schematic during normal operation, and they all appear OK.
>
> I'm sort of stuck at this point. Should I replace the flyback? The part
> number is 2432641AL 25M, and it's T721 on the board; does anyone know of
> an available equivalent?
>
I'm not familiar with the the Superpet but I have had similar faults in other
equipment which were caused by failed joints on the PCB. If the problem
happens reasonably frequently, one approach is to darken the room and watch
the underside of the PCB for little sparks. If it doesn't happen that
frequently, another approach is to try tapping the PCB at various points with
a well insulated implement such as a plastic ruler or other tool to see if the
fault can be mechanically provoked.
Do not overlook the possibility of arcing at the EHT connector on the CRT or
on the CRT base.
I would hate to end up replacing a major component and finding that the
problem was still there.
>
> Alternatively, could this behaviour be caused by a bad electrolytic
> capacitor? I'm specifically suspicious of C754 (47uF/250V), but my knowledge
> of CRT theory is not deep, and I lack a good way to test the capacitor in
> circuit.
>
It's not the sort of thing I'd suspect an electrolytic capacitor of but I
suppose it is possible. Usually when they are stressed enough to make noise,
there are visible signs of stress too.
An oscilloscope connected between its negative terminal and ground it would
probably show a significant increase in ripple or reduction in voltage when
the problem happens if the capacitor is at fault.
Regards,
Peter Coghlan.
