-----Original Message-----
From: Tony Duell <ard(a)p850ug1.demon.co.uk>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Date: Thursday, 29 October 1998 8:54
Subject: Re: Microvaxen bits etc.
>[Using the transceiver section of an ethernet card]
>
>> I think it needs +-12v and +- 5v, but that's not a big problem. (Diskless
>> workstation PSU)
>
>Well, the card might, but the transceiver section will almost certainly
>only need one supply rail. It runs off an _isolated_ (to 1.5kV I think)
>PSU on the card (there'll be a DC-DC converter on the card for this).
>I've never seen such a converter than needs more than one supply voltage
>input.
Yep. Dead right. 12-15v dc to feed a dc-dc xvtr that produces 9v to run
the NE8392C xcvr chip.
>> > Did I mention that you'll need the data sheets on the transceiver chip?
>>
>> You did. Know a source? Online one preferably?
>
>Sure. Try the semiconductor manufacturers. AMD, National Semiconductor,
>Philips, possibly. They should have the data sheets in pdf format to
>download. I remember downloading the National Semiconductor
>8390+8391+8392 data sheets about a year ago.
Exactly as you recalled. I have the PDF files with data for the lot.
Amongst other things, there is a page with a "Typical Application" which is
a cct diagram of a what amounts to an AUI-Thin cable transceiver. Complete
with pinouts of a typical pulse xfmr. Exactly what I needed.
So I'm gonna build me a couple or three from bits of network cards. Should
be able to do it on
a piece of veroboard in about an hour or so. Cabling can be avoided by
connecting the pins of
a male 15pin d directly to the veroboard, then the whole thing can plug in
to the ethernet AUI port on
the back of the VAX.
This has basically solved my problem, as I have several elcheapo ethernet
cards laying about
that can supply all the parts except the 15 pin male d.
Thanks for your help.
Cheers
Geoff
Computer Room Internet Cafe
Port Pirie
South Australia.
netcafe(a)pirie.mtx.net.au
On Oct 29, 18:23, Daniel T. Burrows wrote:
> Subject: Re: Microvaxen bits etc.
> Now I get complaints
> that I am never down at the house, but when I bring things down there to
> work on they are in the way.
Liz got quite shirty about the 20" monitor and the printer in the dining
room. She seemed to think that ten printers was excessive, even when I
pointed out that that was only one for every 3.5 systems.
> take over one of the bedrooms and put a system in there. I even have a 4
> inch conduit running the 350 feet from the office to the house. It is
> buried in the same trench as the power, phone, water, and sewer feed to
the
> office. It has been there for 4 years and I still have not run the coax
> down to the house.
That's OK, it took me two years to run the two serial lines from my room to
the garage, and four more to do the coax. Now I have to run Cat5 as
well... sometime.
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
Hi Doug and all,
At 02:22 AM 10/29/98 -0600, you wrote:
>On Wed, 28 Oct 1998, dave dameron wrote:
>
>> In a recent "Electronic Design" magazine, the column "40 years ago", there
>> was an article about IBM and digitized speech. It is an interesting column,
>> as well as Bob Pease's.
>
>Can you summarize the article? I can imagine a lot of ways to digitize
>speech without a lot of RAM, but I'm curious about what they were doing in
>the 50's with the data. I seem to remember things like "formant"
>decomposition and analysis to be reasearch topics in the 70's. Come to
>think of it, I don't even know when things like the FFT were invented, but
>I thought even that was not until the 60's or so.
>
I don't have it anymore, it had a lot to do with sampling and compression,
as they had only 32k memory. It appeared in the last 4 months, so the
original article was in 1958. Maybe someone else can find it easily?
-Dave
At 12:34 PM 10/25/98 -0800, you wrote:
>When I was a kid I tho't that the keypad was incredibly lame because it
>didn't have a comma key. The only thing I would ever use it for would have
>been typing in numbers in DATA statements so it seems like a dumb idea.
Well, as someone who learned 10-key touch before I learned to type, the
idea of a comma on the keypad does not seem so obvious. More important was
the plus, minus, and period keys, for true data entry.
--------------------------------------------------------------------- O-
Uncle Roger "There is pleasure pure in being mad
roger(a)sinasohn.com that none but madmen know."
Roger Louis Sinasohn & Associates
San Francisco, California http://www.sinasohn.com/
>So, to come back on topic, the best for a TRS-80
>emulator is still DOS. Install it, or even boot
Dunno if this link is still up, or if it's old news, but try
http://www.agate.net/~tvdog/emulators.htm and see what you get.
Interestingly enough, I used to have the URL for a Model III emulator that
ran on the Atari ST. You could then get the ST emulator for DOS....
--------------------------------------------------------------------- O-
Uncle Roger "There is pleasure pure in being mad
roger(a)sinasohn.com that none but madmen know."
Roger Louis Sinasohn & Associates
San Francisco, California http://www.sinasohn.com/
Briefly, here could be a solution to us inadvertently posting what should
be private replies to our whole list:
Can listproc on the U. of Wash. server be set so that the "Reply to:" field
defaults to original poster and not to ClassicCmp?
For example, Majordomo software running on a server handling a different
list I am a member of is set this way. Therefore a reply will go to the
previous sender in a msg thread. If the message is to go to the whole list
then we simply type the "r-390(a)qth.net" address into either the "To:" or
"CC:" field. Works very well it seems. FYI: 'R-390' is the military
nomenclature of a high performance military surplus shortwave receiver that
is truly a "classic" as far as its owners are concerned. I would even wager
that Wm. Donzelli may have one too.
As the reasoning that the message should always go to the list, we should
just remember to specify the ClassicCmp addr. in the "To:" or "CC:" field.
If we do not see a msg we intended for the list come up in our own email
Inbox later then we know that we accidentally forgot and then have the
option of reconsidering sending it to the whole list. This will help keep
personal stuff such as discussing a deal to buy/sell something from the
rest of the world --or those flames that get thrown around which nobody
here appreciates.
I'm still waiting for M$ s/w that works well.
Whatever happened to Bill Whitson anyway?
Regards, Chris
At 13:48 10/29/98 +0000, Julian Richardson <JRichardson(a)softwright.co.uk>
wrote:
>>> oops, that was supposed to go to Sam only.
>>> ELM needs a "reply to sender" key.
>
>*sigh*. In exchange the menu option is "reply to sender" but that
>replies to the list, despite the name of the original sender appearing
>in the "from" column. One day MS will write some software that works...
>(OK, so that's completely off-topic... but it won't be so much ten years
>from now... look at it as being ahead of its time... :)
>
>cheers
>
>Jules
>>
>>
>>
>
Christian Fandt, Electronic/Electrical Historian
Jamestown, NY USA cfandt(a)netsync.net
Member of Antique Wireless Association
URL: http://www.ggw.org/freenet/a/awa/
>
>The first paragraph sounds familiar. Liz complained about the black cable
>snaking along the landing -- even though she finally got email and remote
>printer access out of it -- because it was "ugly black" RG58, as she put
>it. She wasn't at all impressed with a bright blue AUI drop cable paired
>with bright yellow thick ethernet. I just thought she'd be pleased with
>something prettier...
I know the problem all to well. They just have no sense of humor on such
things. I moved all of my equipment to mobile homes I use for office and
storage. 4 now soon to be 7 all sandwiched together. Now I get complaints
that I am never down at the house, but when I bring things down there to
work on they are in the way. Now that the kids are off to college I plan to
take over one of the bedrooms and put a system in there. I even have a 4
inch conduit running the 350 feet from the office to the house. It is
buried in the same trench as the power, phone, water, and sewer feed to the
office. It has been there for 4 years and I still have not run the coax
down to the house.
Dan
On Oct 29, 21:26, Tony Duell wrote:
> Subject: Re: Microvaxen bits etc.
> > You guys are both lucky. I inherited 600' of _bright orange_ (day-glo)
> > 10Base2 cable that my wife will barely allow in the *garage*...
> >
>
> Oh, my parents (who own the house that's full of my little collection)
> prefer bright cables as they're less likely to trip over any temporary
> cabling I happen to have plugged together...
The first paragraph sounds familiar. Liz complained about the black cable
snaking along the landing -- even though she finally got email and remote
printer access out of it -- because it was "ugly black" RG58, as she put
it. She wasn't at all impressed with a bright blue AUI drop cable paired
with bright yellow thick ethernet. I just thought she'd be pleased with
something prettier...
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
Voice _activated_ or voice _operated_? I could easily imagine a type
writer turning on when you talk to it, but not a typewriter that can
understand speech. Though, with a housefull of tubes, it could
probably be done...
>
>I saw a reference to a voice-activated typewriter that was patented in
1916.
>(No, that is not a typo.) Unforunately the site isn't in my bookmark
file
>or if it is, the reference isn't easily accessible.
>
>-- Derek
>
______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com
> > P.S.: has anybody som OSI stuff for sale ?
> And for years I thought, based on responses from a.f.c,
> that I was the only person in the world who cared for
> OSI equipment!
> Since there are some interested people, let me repeat
> a question that I have asked on the net before:
> Does anyone have a complete working copy of OS-65u,
> the multi-user OS for the C3 and C4 series? If you do,
> please contact me!
No. Anything I have is a C1P Board (build nicly
in a Childrens school desk :) and a fitting
OSI video board and some casette soft. I wanted
to have one when OSI was a big thing, but I hadn't
the money - and now I can't find any.
Gruss
H.
--
Ich denke, also bin ich, also gut
HRK
