On 02/11/20 18:00, cctech-request at classiccmp.org wrote:
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> Today's Topics:
> 1. looking for: fairchild model 8200 manual (Adrian Stoness)
> 2. Opening a MicroVAX 2000 (Antonio Carlini)
> 3. RD53 failure modes (Carlos E Murillo-Sanchez)
> 4. PC3XC manual? (Paul Koning)
> 5. Re: Old IBM magnetic media (cctalk at emailtoilet.com)
> 6. Looking for info - Computer Extension systems WE-VM8E8 board
> (Bob Smith)
> 7. Re: RD53 failure modes (Fred Cisin)
> 8. IBM Type 31 Alphabetical Duplicating Keypunch available,
> Seattle area (Josh Dersch)
> 9. Re: IBM Type 31 Alphabetical Duplicating Keypunch available,
> Seattle area (William Donzelli)
> 10. Re: IBM Type 31 Alphabetical Duplicating Keypunch available,
> Seattle area (Tony Aiuto)
> 11. Re: IBM Type 31 Alphabetical Duplicating Keypunch available,
> Seattle area (Lyle Bickley)
> 12. Making use of Panda dist TOPS20 (David Griffith)
> 13. Re: Making use of Panda dist TOPS20 (Ethan Dicks)
> 14. Re: Opening a MicroVAX 2000 (Josh Dersch)
> Message: 1
> Date: Sat, 8 Feb 2020 18:50:25 -0600
> From: Adrian Stoness<tdk.knight at gmail.com>
> To: "General Discussion: On-Topic and Off-Topic Posts"
> <cctalk at classiccmp.org>
> Subject: looking for: fairchild model 8200 manual
> <CAA3rs201WpX8iERnhTYv1EKksaR8-UTTHAPeTE6S1FieNY6N7Q at mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
> trying to find a manual for a fairchild universal counter timer model 8200
> circa 1968?
> got one i found like to see if i can get it working for the rack.
> can only find this sales catilog from 68
> hasnt been powered up since prolly 1986 has a tag on it about channel B not
> was found in a rack sitting out in 40below temps prolly been sitting there
> for 20-30yrs in a storage shed the guts are realy clean on it so proly has
> potential to get working again.
> Message: 2
> Date: Mon, 10 Feb 2020 11:17:03 +0000
> From: Antonio Carlini<a.carlini at ntlworld.com>
> To: "General Discussion: On-Topic Posts"<cctech at classiccmp.org>
> Subject: Opening a MicroVAX 2000
> Message-ID:<7d2cf42b-03c1-b514-d8aa-b85c0af83695 at ntlworld.com>
> Content-Type: text/plain; charset=utf-8; format=flowed
> I'm trying to non-destructively open up a MicroVAX 2000.
> I've removed the bottom "dressing" section (which holds some of the I/O
> connectors)? but the next step isn't obvious. None of the manuals I have
> cover dismantling and the net doesn't have an IPB or similar available.
> Other people have managed to get inside (I can see their results) so I
> must be missing something obvious ...
From memory, the 2000 case covers are really tight and may need a bit
of leverage to remove, assuming all the screws have been removed. Very
close fitting rfi shields + several years of light corrosion etc...
definitely you should be able to fix it.
This kind of problem is caused by the missing thickness of the rubber
stoppers of the positioner, which became goo in the years.
You have two ways to solve this problem.
First of all, remove the disk top cover plate in clean room, locate the
positioner and note that is full of black goo. Remove it at best with
isopropyl alcohol, sticks, paper, whatever, but be SURE not to spurt /
touch on the disk surface.
- method 1, easier: locate two screws at the sides of the positioner coil
which hold on position left and right stoppers.
You should loosen the left one (head on the center of the disk) and move
just slightly to the right, then tight the screw again.
As you must repeat some times to find the right position, my advice is to
have a PSU connected to the disk, and try before really tightening the
screw if it is enough / too much / good.
In this way you compensate for the thickness of the missing rubber stopper,
but the head will receive some more shocks at start and during operations.
-method 2: you will replace the missing rubber with a new one. You should
find a piece of rubber sheet, thickness around 1mm. You cut a small chunk
and somehow glue it to the stoppers again.
Of course you need to clean it very well before, otherwise glue will not
Let me know if you manage to fix it.
I'm trying to wrap my head around getting Mark Crispin's Panda
Distribution of TOPS20 set up such that I can actually make use of a
TOPS20 environment. I keep finding lots of manuals through Google
searches, but I'm missing a few critical things. Things that are evading
me are as follows:
1) How do I get networking set up, preferably such that it'll work on a
host that's given a DHCP address that could vary? I'd like to be able to
ssh to a specific port and then be connected to a terminal on the emulated
2) How do I set or alter a regular user's disk quota?
dave at 661.org
A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
Q: What is the most annoying thing in e-mail?
My Pro has a PC3XC 4-line serial interface, and I know I once had a manual for it because the driver code I wrote mentions it. But I can't find it -- it may have been lost or it may have been a DEC document I did not take with me.
Is there a PC3XC-BA programming manual anywhere?
I have 3 of these omnibus boards, all fully populated with 8K 12 bit
words of 2102 static ram.
What I don't have is the documentation that describes the way the
jumpers need to be set up for each 8K field.
The set up seems to involves what looks like a 3 parallel 8 pin
sockets that look like one and a half 16 pin DIP socket.
Any hints or pointers toward docs would be greatly appreciated