I just picked up an IBM Correcting Selectric III, but now I've run
into a little problem. The guy said he had it cleaned/checked out just
before he stopped using it 10 years ago, but of course a lot can
happen over 10 years in storage.
I rolled in a piece of paper to give it a test, worked great, but
after a couple paragraphs it has hit a problem. Basically, the
ribbon/ball head seems to no longer do newlines properly. It will
advance the paper but not return the head to the left margin. If I try
typing anything after hitting Return, the keys are in the stiff state,
like when the machine is off. If I Backspace all the way back to the
left margin, the keys seem to unlock, until I hit Return again.
Any Selectric Grand Masters around that can help me figure out what's
gone wrong? The machine seems to be in really great shape, EXCEPT for
this problem.
Thanks
John
--
Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn
A Sharp HC-4500A hand held pc, unable to test it as no ac adapter was with
it. Also picked up a TurboGrafx 16 CD system card. Not tested yet either.
John
>
>Subject: Re: VAXstation/MicroVAX 2000 CPU/FPU overheating?
> From: ard at p850ug1.demon.co.uk (Tony Duell)
> Date: Sat, 01 Mar 2008 00:46:23 +0000 (GMT)
> To: cctalk at classiccmp.org
>
>>
>> At 9:26 -0600 2/29/08, Dave wrote:
>> >Yes, I'm wondering if it's something like that, however how likely is it
>> >that both devices would experience the same fairly-uncommon failure mode
>> >at the same time?
>>
>> I'm chiming in very late and probably not very helpfully, but is
>> there any way a decoupling cap in the vicinity of the FPU/CPU could
>> either load them or generate heat itself by beginning to short to
>> ground? My only VAX (4000VLC) had a fault like that in the reset
>
>Interesting idea.... I've worked with chips that had connectiosn for
>decoupling capacitors for particualr secitons in the chip (the most
>ovious being the Transputer which needs a 1uF capacitor between 2 of its
>pins to decouple the clock multiplier PLL). In general, these components
>are not conencted to a power line or ground other than through the chip.
>
>I have no idea if the VAX 2000 chips are like this, but if they are, then
>a leak in one of those cpacitors would certainly cause thigns to run hot.
The 78032 chip is 1986 surface mount (gull wing) tech. No cap on the
chip, same for the FPU. At the time it was pushing the limit for NMOS
for power and density, they plain just run hot.
If you don't like them that hot adding another set of fins to radiate
that heat helps.
Allison
>-tony
> You could have, for example, four RL02s each capable of being
> assigned a "pack" from the card.
> What were the biggest non-MSCP-attached drives?
> How hard would they be to emulate?
While RL02's would probably be easy to emulate,
at 10MB a pop, you don't get alot of bang for your buck.
Note that some operating systems only support 4 drives
per controller, so that will need to be a consideration
as well, when drives are being partitioned.
Note: The capacities mentioned below are approximations.
The largest non-MSCP drive that I'm aware of is the RP20, at 929 MB.
However, I think that was only supported on the KL10. ;-)
For the rest of the world, you'll be looking at MASSBUS devices -
The RP07 is next in line at 504MB, but not supported by all operating
systems.
The RM05, at 256MB . . . definitely supported by RSTS/E;
not sure about smaller operating systems like RT11 though.
I think the RP06 was something like 176MB, although you're still into
MASSBUS.
Once you move below the MASSBUSS level, I think you're looking at an
RK07,
which is what? 25 or 26MB ?
I'm sure someone may chime in with more. . .
T
Hello all,
as I'm trying out some "new" old computers I got during the last few weeks, I'm of course encountering new problems. I have spent some time with search engines without major success, so I figured it would be okay to ask here.
Case one concerns the SGI O2 workstation. I pulled three of those out of a dumpster; they only had a piece of the blue case plastic left on top and the base trays were broken as well - even the CD bezels are missing. The chassis look pretty battered but the machines power up, play their happy notes and enter the resident menu. Each has one disk tray but the disks were probably ruined by being flung into the container. They also all have an A/V module with the O2cam connector in the back panel. The connector is broken in one of them and I'll probably remove it altogether since I don't have a cam anyway but... the S-Video and Composite I/O jacks in the side panel are covered with a square sheet of textured self-adhesive plastic. The PCB silkscreening states they are Moosehead A/V modules and it looks like no major components are missing from the boards so I hope the video I/O will work once I pull the stickers off?
TIA,
--
Arno Kletzander
Student Assistant // Studentische Hilfskraft
Informatik Sammlung Erlangen
www.iser.uni-erlangen.de
Ist Ihr Browser Vista-kompatibel? Jetzt die neuesten
Browser-Versionen downloaden: http://www.gmx.net/de/go/browser
At 9:26 -0600 2/29/08, Dave wrote:
>Yes, I'm wondering if it's something like that, however how likely is it
>that both devices would experience the same fairly-uncommon failure mode
>at the same time?
I'm chiming in very late and probably not very helpfully, but is
there any way a decoupling cap in the vicinity of the FPU/CPU could
either load them or generate heat itself by beginning to short to
ground? My only VAX (4000VLC) had a fault like that in the reset
circuit which would sometimes hold it in reset, as you may remember
>from a couple of years ago.
--
- Mark, 210-379-4635
-----------------------------------------------------------------------
Large Asteroids headed toward planets
inhabited by beings that don't have
technology adequate to stop them:
Think of it as Evolution in Fast-Forward.
> Date: Thu, 28 Feb 2008 19:51:10 +0000 (GMT)
> From: ard at p850ug1.demon.co.uk (Tony Duell)
> Subject: Integral RAM upgrade
> To: cctalk at classiccmp.org
> Message-ID: <m1JUomf-000J3kC at p850ug1>
> Content-Type: text/plain
>
> I recently bought another HP Integral on E-bay, and after the normal
> cleanup on the floppy drive it works fine. The expansion slots both
> cotnained boards, one was a 512K RAM board, the other an RS232 oard
> (which is the main reason I watned this machine!).
>
> Anyway, the RAM board was clearly identical to the 1M board,
> just with
> only have the RAM chips fitted and the links set differently.
> Having got
> a lot of 41256 chips on old PC memory boards, I spent the afternoon
> upgrading it to 1M.
>
[snip]
>
> In my machine, wioth no RAM boards fitted. there's 264K free.
> With the
> 512K board, it reports 764K free. And with the 1M board, 1264K free.
>
> My question is what's happening to the other 12K of each half-meg? Or
> deos 'status' have an odd definition of a kilobyte?
>
> -tony
>
Don't know where the 12K is going to - maybe address space reserved for
I/O - but I have to say I was extremely impressed by the upgrade -
almost exciting reading!
