Re: PDP-11/24 CPU later version

[Paul Anderson]

The M7133 is etch D or earlier.  The M7133-YA  is rev E or later.

I'll put it on my look for list.

On Tue, Feb 7, 2017 at 4:41 PM, Noel Chiappa 
wrote:

> So I was recently provided (thanks!) with a copy of the later rev of the
> PDP-11/24 Tech Manual (EK-11024-TM-003), which I have had scanned for a
> while
> now (waiting for a quite period on the list ;-), and is now available for
> upload here:
>
> http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/EK-11024-TM-003.pdf
>
> (Bitsavers et al, please pick this up and distribute.)
>
> So it has an Appendix D, which described the -YA later rev of the CPU card
> (in which a bunch of gates were replaced with a couple of custom gate
> arrays.
> Does anyone have one of these? I'd love to get a photo of one, if so.
>
> Thanks!
>
> Noel
>

PDP-11/24 CPU later version

[Noel Chiappa]

So I was recently provided (thanks!) with a copy of the later rev of the
PDP-11/24 Tech Manual (EK-11024-TM-003), which I have had scanned for a while
now (waiting for a quite period on the list ;-), and is now available for
upload here:

http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/EK-11024-TM-003.pdf

(Bitsavers et al, please pick this up and distribute.)

So it has an Appendix D, which described the -YA later rev of the CPU card
(in which a bunch of gates were replaced with a couple of custom gate arrays.
Does anyone have one of these? I'd love to get a photo of one, if so.

Thanks!

Noel

Re: The Biggin Hill Omnibus

[Ethan Dicks]

On Tue, Feb 7, 2017 at 1:46 PM, Tony Duell  wrote:
> As for motors, I had to strip the punch motor in the PC04 today...
> ...the motor was solid. The bearing oil had turned to something rembling tar.

I recently did that with a Model 19 Teletype motor.  The goo wasn't as
black as tar, but I would call it something between "caramel" and
"treacle".

Bit of cleaning, bit of manipulation, and a bit of new oil and the
motor spins smooth as silk.

-ethan

Re: The Biggin Hill Omnibus

[Paul Berger]

On 2017-02-07 2:46 PM, Tony Duell wrote:

On Tue, Feb 7, 2017 at 6:32 PM, Paul Koning  wrote:

On Feb 7, 2017, at 4:54 AM, Tony Duell  wrote:

No, not Transport For London routes 246, 320, 464, R2 or R8 :-)

Some of you might like the photos here ...

https://www.flickr.com/photos/tony_duell/albums/72157677925921112

Wow.  Disassembling and rebuilding motors... not so crazy if it's a fan motor 
but then
a bit later I see you took DECtape reel servos apart.  And I haven't seen 
someone
take apart and rebuild a contactor before.

I'll dismantle (and often reassemble ;-)) just about anything.

As for motors, I had to strip the punch motor in the PC04 today. I
fitted the step-down
transformer so I could run said unit, then found the motor was solid.
The bearing oil
had turned to something rembling tar. I will try to get photos of that
uploaded soon.

I have seen that happen to running motors that have sintered bronze 
bearings.  On some old systems I serviced that had 8" diskette drives 
turned by an AC motor that ran all the time the system was powered on, 
customers rarely used the diskette drive, but we had to in order to run 
diagnostics on the system.  We would often find the motor seized  solid 
and   hot enough to fry eggs on.   We would of course replace the motor, 
but while I waited for the replacement, I would take out the motor pump 
a little oil into the bearing, and turn the motor with vice grips.  The 
oil would dissolve that black gunk and you could get the motor going 
again and get on with the job while waiting for parts.  I usually found 
that once that gunk was cleaned out the bearing had some play in them.


Paul.

Re: The Biggin Hill Omnibus

[Tony Duell]

> I still remember the DEC field service tech repairing an RC11/RS64 fixed head 
> disk
> drive with a bad motor.  He disassembled the drive to take out the spindle 
> motor
> (which is also the platter spindle), sent it off to Appleton Electric Motors 
> for new
> bearings, then put it all back together.  Worked just fine, didn't even lose 
> any data.

I think I'd be the one who strips the motor, pulls off the old
bearings and presses on
the replacements.



>
> Clearly you're working at that level, which even by the standards of 1974 
> professional
> computer technicians is right at the top of the field.

But I've not learnt to swap oiut the alternator when I can't find the
tyre that is flat yet...

-tony

Re: The Biggin Hill Omnibus

[Tony Duell]

On Tue, Feb 7, 2017 at 6:22 PM, jos  wrote:
> On 07.02.2017 10:54, Tony Duell wrote:
>>
>> No, not Transport For London routes 246, 320, 464, R2 or R8 :-)
>>
>> Some of you might like the photos here ...
>>
>> https://www.flickr.com/photos/tony_duell/albums/72157677925921112
>>
>>   -tony
>>
> Now there is  a nice P850 !

Is there any other sort :-)

A few other machines crept into the photos. An RK07, the P850 (with Trend Paper
Tape Station), a VAX11/730, Acorn System, a Creed 7E and Creed 444 teleprinters,
Versatec V80 electrostatic printer, etc.

-tony

Re: The Biggin Hill Omnibus

[Paul Koning]

> On Feb 7, 2017, at 1:46 PM, Tony Duell  wrote:
> 
> On Tue, Feb 7, 2017 at 6:32 PM, Paul Koning  wrote:
>> 
>>> On Feb 7, 2017, at 4:54 AM, Tony Duell  wrote:
>>> 
>>> No, not Transport For London routes 246, 320, 464, R2 or R8 :-)
>>> 
>>> Some of you might like the photos here ...
>>> 
>>> https://www.flickr.com/photos/tony_duell/albums/72157677925921112
>> 
>> Wow.  Disassembling and rebuilding motors... 
> 
> I'll dismantle (and often reassemble ;-)) just about anything.
> ...
> The only motors I am a bit careful with dismantling are permanent
> magnet DC ones.

I still remember the DEC field service tech repairing an RC11/RS64 fixed head 
disk drive with a bad motor.  He disassembled the drive to take out the spindle 
motor (which is also the platter spindle), sent it off to Appleton Electric 
Motors for new bearings, then put it all back together.  Worked just fine, 
didn't even lose any data.

Clearly you're working at that level, which even by the standards of 1974 
professional computer technicians is right at the top of the field.

paul

Re: The Biggin Hill Omnibus

[Tony Duell]

On Tue, Feb 7, 2017 at 6:42 PM, Mouse  wrote:
>> Wow.  Disassembling and rebuilding motors... not so crazy if it's a fan moto$
>
> If I had to pick anyone as someone capable of it, though

I learnt something very important about 40 years ago. And that is not to be
afraid to try something because you might not be able to do it. And heck, motors
are not complicated really. I have an HP9125 plotter (for the 9100
calcualtor), when
I got it, both motors had open-circuit windings. I rewound them. It
took me a couple
of tries, but there was no alternative.

-tony

Re: The Biggin Hill Omnibus

[Tony Duell]

On Tue, Feb 7, 2017 at 6:32 PM, Paul Koning  wrote:
>
>> On Feb 7, 2017, at 4:54 AM, Tony Duell  wrote:
>>
>> No, not Transport For London routes 246, 320, 464, R2 or R8 :-)
>>
>> Some of you might like the photos here ...
>>
>> https://www.flickr.com/photos/tony_duell/albums/72157677925921112
>
> Wow.  Disassembling and rebuilding motors... not so crazy if it's a fan motor 
> but then
> a bit later I see you took DECtape reel servos apart.  And I haven't seen 
> someone
> take apart and rebuild a contactor before.

I'll dismantle (and often reassemble ;-)) just about anything.

As for motors, I had to strip the punch motor in the PC04 today. I
fitted the step-down
transformer so I could run said unit, then found the motor was solid.
The bearing oil
had turned to something rembling tar. I will try to get photos of that
uploaded soon.

The only motors I am a bit careful with dismantling are permanent
magnet DC ones.
The field can demagnetise if you don't fit a 'keeper'. But I will do
those when I have to.
See the photos in my VAX11/730 album on the same site for the insides
of the TS05
motor.

As for the cabinet fan, the old bearings were rusted solid, but the
windings were
perfect, and a pair of ball races are a lot cheaper than the entire
fan. Strangly
said bearings were metric dimensions (which made them easier to get for me).

-tony




>
> Nice photos, indeed.
>
> paul
>

Re: The Biggin Hill Omnibus

[Mouse]

> Wow.  Disassembling and rebuilding motors... not so crazy if it's a fan moto$

If I had to pick anyone as someone capable of it, though

/~\ The ASCII Mouse
\ / Ribbon Campaign
 X  Against HTMLmo...@rodents-montreal.org
/ \ Email!   7D C8 61 52 5D E7 2D 39  4E F1 31 3E E8 B3 27 4B

Re: The Biggin Hill Omnibus

[Paul Koning]

> On Feb 7, 2017, at 4:54 AM, Tony Duell  wrote:
> 
> No, not Transport For London routes 246, 320, 464, R2 or R8 :-)
> 
> Some of you might like the photos here ...
> 
> https://www.flickr.com/photos/tony_duell/albums/72157677925921112

Wow.  Disassembling and rebuilding motors... not so crazy if it's a fan motor 
but then a bit later I see you took DECtape reel servos apart.  And I haven't 
seen someone take apart and rebuild a contactor before.

Nice photos, indeed.

paul

Re: The Biggin Hill Omnibus

[jos]

On 07.02.2017 10:54, Tony Duell wrote:

No, not Transport For London routes 246, 320, 464, R2 or R8 :-)

Some of you might like the photos here ...

https://www.flickr.com/photos/tony_duell/albums/72157677925921112

  -tony


Now there is  a nice P850 !


Jos

Re: The Biggin Hill Omnibus

[Jonathan Katz]

On Tue, Feb 7, 2017 at 9:54 AM, Tony Duell  wrote:
> Some of you might like the photos here ...
> https://www.flickr.com/photos/tony_duell/albums/72157677925921112

Better than Coronation Street Omnibus, that's for sure.

-- 
-Jon
+44 7465 605833

The Biggin Hill Omnibus

[Tony Duell]

No, not Transport For London routes 246, 320, 464, R2 or R8 :-)

Some of you might like the photos here ...

https://www.flickr.com/photos/tony_duell/albums/72157677925921112

 -tony

tu58fs - PDP-11 file sharing with TU58 tape emulator, now RT-11

[Jörg Hoppe]

Next milestone reached:

tu58fs 1.0 now supports the RT-11 file system, additional to DOS11/XXDP 
(phew!)


And its easier to use: I also precompiled binaries für Linux x64, Win32 
Cygwin, ARM Beaglebone Black and RPi.
Also some batch files show typical usage, XXDP/RT-11 tape and disk 
images are included.


Docs on http://retrocmp.com/tools/tu58fs
Precompiled releases at https://github.com/j-hoppe/tu58fs/releases

The RT-11 filesystem has the special features of "extended directory 
entries" and "file prefixes". These are fully supported by tu58fs, but I 
never heard of real-life usage. Anybody can talk about it, or has RT-11 
images with dir extension and/or file prefixes?


best,
Joerg