>From: "Jay West" <jwest at classiccmp.org>
>
>I'm not sure what these things are called... but I need some. I'm calling
>them plastic "push rivets", where a plastic plunger pushes through a collar
>with 3 or 4 plastic legs. These legs break off.
>
>All the ones I've seen so far are a pretty common size. However, the ones I
>need two of at the moment are slightly smaller than that. Specifically,
>these are the two plastic push rivets from an HP 264X terminal that hold the
>metal cover over the CRT.
>
>Anyone ever find a source for these? Both my local electronics places came
>up empty.
>
>Regards,
>
>Jay West
Hi Jay
Look at the one in the online McMaster-Carr catalog
on page 3054. I think these are the right ones.
http://www.mcmaster.com
I think they may have a minimum order but I'm sure
that with a few minutes looking you'll find enough
things to make an order.
Later
Dwight
------------------Original Message:
Date: Wed, 13 Apr 2005 17:23:57 -0700 (PDT)
From: "Dwight K. Elvey" <dwight.elvey at amd.com>
Hi
I'm looking for a DP8303 but with some software
changes I could most likely get a DP8304 to work.
Dwight
------------------Reply:
Hi
I should have a couple of DP8304BNs (apparently
equivalent to INS8208BNs). If you're still looking,
email off-list & I'll look for them.
mike
A few words about the older (500 series) scopes, which have had a few
mentions in the main thread:
they do suffer from switch failure, usually due to poor maintenance, and the
switches are specials, the only source is another scope, and it usually has
to be one of teh same model. The Paxolin wafers are also susceptable to
insulation breakdown ( the insulation has to be good, some of the trigger
switches have 500V potential difference between adjacent contacts), though
this is often caused by the use of inapropiate switch cleaner, or excessive
lubricant - NEVER spoary WD40, Duck Oil or the like on a switch! Use the
proper cleaner, and contact lubricant, sparingly. Clock oil is useful for
lubricating the bush part of the switch (where the spindle goes through the
frame), and a light grease for the detent mechanism. I have had some luck at
recovering these switches when contaminated, but it involves removing them,
>from the scope, soaking in de-greaser, drying, and then lubricating
properly - not for the faint hearted.
The all valve (tube) scopes are usually fairly easy to get parts for (545,
545A, 535, 535A etc), and fairly easy to maintain and repair (I know 100
valves looks daunting, but they can be broken down into small sections for
fault finding. The hybrid scopes like the 545B can have some strange
transistors in them, which are very difficult to source, and expensive to
buy.
Some of the later models (including the 545B and 547) have an EHT
transformer that is prone to failure - it can be re-wound, but it will cost
you $50 (more if your outside the USA).
A lot of the later, high speed units (547, 585, 453, 454 etc), as well as
some of the faster plugins (1S1, 1S2, and some of the 3 series timebases)
have tunnel diode trigger circuits. These are excellent, fast, stable
trigger circuits, but the tunnel diodes are now very rare and expensive.
Having said that, I have several of these beasts (535A, 545A & B, 547, 585,
561, 564 and 564A), in various states of repair. The 535A gets used
regularly, and is currently at work, as I needed a scope with a stable low
frequency trigger, and a differential input - our modern Philips scopes
don't like triggering at 25Hz! The 564 is a useful analogue storage unit,
though it only has a 10MHz bandwidth. The 547 is a good 50MHz scope (with
the right plug-in), and the 585 should go to 100MHz (but only for the first
5 minutes after calibration, 85MHz is more like it - still not bad for an
all valve scope!). They are all good scopes to use, but you do need to
understand them and play with them before you try to do serious work, the
have lots interesting little idiosynchrasies.
Jim.
Please see our website the " Vintage Communication Pages" at WWW.G1JBG.CO.UK
Scott Stevens said:
>
> Remember, eBay all started because of Pez dispenser collecting. Regular
ISTR that this is not true; that story was created for marketing
purposes with no basis in fact.
I am looking for the origional GW-Basic Compiler what would you like in
trade I do have a great deal in my research Archives here.
Dr. Pentecost
paul-pentecost7 at juno.com
I have been contacted by someone who has
" two working IBM System 34 1980 vintage mainframes. Complete with
all documentation and operator console."
There is no dock, but the units are on casters and will roll up the
loading ramp of a uhaul truck or similar.
He wants them to go to a good home otherwise I will have to send them
to a metal recycler for crushing.
They are located in Ottawa Canada.
For anyone needing a reminder of what these look like you can look here
http://www.chd.dyndns.org/IBM/
--
Collector of vintage computers http://www.ncf.ca/~ba600
>From: "Allison" <ajp166 at bellatlantic.net>
>
>>Subject: Re: Navtel 9460 Protocol Analyzer info?
>> From: Scott Stevens <chenmel at earthlink.net>
>> Date: Wed, 13 Apr 2005 22:50:15 -0500
>>
>>>
>>> How about one Z8530? :-) [it's a DUART, for the Zilog-impaired]
>>>
>>
>>The 8530 is a useful part for dedicated purposes, but isn't it severely
>>bandwidth cramped? I am thinking that it's the serial chip in the
>
>Nope, it's a 2mb/s part thats what the DMA is for. Even the Z80 dart
>a earlier part was good for more than 800kb/s.
>
>>Sparcstations, correct me if I'm wrong. A few years ago I was pondering
>>making a 'dialup connecting system with NAT server' out of a
>>SparcStation Classic (the little lunchbox type Sparc). I discovered
>>quickly that the serial ports on the Sparc are VERY speed constrained
>>because of the 8530 chip. It would have been impossible to connect my
>>USB Courier V-everything modem to it at, say 57,600 baud, because the
>>8530 just plain won't go that fast.
>
>That was implmentation not the part.
>
>Allison
Hi
As I recall it was the selection of the crystal frequency.
Dwight
I hope this is Davids address, i was reading some old information in a news
group and i wanted to let you know that i run across all types of older
computer equipment on a daily basis, and i deal with 20-30 different scrap
dealers as well, so anything you need cplease contact me iit would help to
even send a wish list and feel free to give out my contact info to anyone
that may need my help.
best regards,
Jeff Silverman
Select Computer Technology Inc.
774 Charcot Ave, San Jose, Ca 95131
Tel: 408-944-9475 Fax: 408-944-9476
One use of a protocol analyzer.
In one of my previous lives I worked for AT&T Western Electric. I
arrived just as Ma Bell and the Babies were splitting, around 1983-1984.
We used a protocol analyzer all the time when troubleshooting our Gerber
photo plotter. The Gerber plotter used a series of collimated apertures
to generate lines in the photoresist of master circuit masks. We were
making masks for circuits and the plotter would have issues with some of
the plots we generated.
The Plotter ran in a dark room over a granite table to make the master
mask. One problem was that occasionally on very long lines the plotter
had timing issues. We found that plotting several shorter lines worked
better. Also we had problems when drawing "circles" which were actually
many sided polygons. We used a HP protocol analyzer and found that we
could create and try different sets of test cases very rapidly. We
would also store up the entire set of plot commands and replay them
trying different permutations.
We generated the production plot commands using a "C" program on an AT&T
3B2 or on one of our PDP-11/70's. All of our production systems were
dual PDP-11/70's. Each unit had its own pair of disks and a connection
to a shared dual ported drive that we used as a swap drive for backups.
We could tweak commands using the protocol analyzer, change plot line
widths, plotter speed, and select a different aperture, and modify
acceleration and deceleration rates.
Kind of like playing with HPGL commands.
I can't remember if I went to the week long class to learn how to
operate the unit. I know that Western Electric was big on training
classes.
Mike
