Actually, the Rayovac 840 is rated at 4.5v 800 mAh, so putting in
3*AAA is a reasonable (and "cost effective") thing to do. But the
footprint is a tad larger. There's room...
The NetBSD pages specifically mention a FCT623 as the cause of
problems but I didn't want to get into that mess unless I had to... A
Linux FAQ claimed that changing the video or serial cables could also
cause problems.
> The big minor thing is the back panel to the stand. It's missing
Bill, we have several *SR-33 "parts" machines; I'll mail you a back
panel for the stand. Send me your address in a private message.
Brent wrote:
> Some minor changes were made to the Murray encodings and it became the
> ITA #2, but referring to it as Baudot code continued for general
> reference. In other words (like so many other things), both terms would
> seem reasonable or 'correct' depending on the perspective one is coming
> from.
I will note that from an academic/historic standpoint that MacKenzie's _Coded Character Sets: History and Development_ calls it CCITT #2 and I don't think he uses the word Baudot at all.
But I also feel that MacKenzie's book is written almost entirely from a standards-committee mindset. There's occasional mention of "real world usage after the character set was standardized" but it's brief.
Tim.
> I remember my first computer experiences were in terminal rooms full of
> teletypes. You realised just how noisy they were when the machine (a
> DECSYSTEM-20) went down and all the terminals stopped at once. I would love
> to get hold of an ASR33 but they seem pretty rare these days.
Don't forget THE SMELL of a room of working model 33's. I'm not sure
exactly what the smell was - probably a mix of ozone from the motors,
warm oil on the mechanical parts, and some of the smell of oiled
paper tape - but that was part of the experience too :-)
Oiled paper tape could actually go rancid under some conditions
(that I'm unclear about today!). I wonder if that's one of the smells
I remember. In particular the smell from the hoppers that
Caught the holes punched from the tape as being not the typical
Teletype smell but something stronger and more offensive. The hoppers
Were not necessarily emptied daily :-)
Tim.
>
>> The datacenter was always at 62 degree's, after working 4-5 hours in
>> there, your knuckles started to stiffen up and you'd feel the cold from
>> the floor come up into your shins... ah.... good times, good times :-) I
>> loved the quietness, all you heard was the sounds of fans whirling away,
>> it was a deafening kind of quiet background noise, I miss that.
>
> It really is a good feeling. Only true geeks seem to appreciate it,
>though.
>
My last boss, who was from the sales end of the organisation occasionally
had to help me move stuff in our data centre. He didn't mind the heavy
lifting but he really hated being in the place. It didn't bother me at all,
especially if the office was hot and sticky.
What I miss is from 20 years ago, in a different place, the 400Hz drone of
power supplies in equipment connected to a motor-generator set. Never mind
the video - does anyone have a sound recording of that?
Regards,
Peter Coghlan.
Technology news of two days ago spoke of the Computer History Museum(a
past visitor) in Mountainview, CA(Silicon Valley) having a 2000 year
timeline and display. I hadn't realized computers have been around for
2000 years! Nevertheless, computer/electronic newsletters such as this
should relish in how people/orgaization(s)/institution(s) are
attempting to preserve computings past for all, technophiles and
technophobes. Maybe this will give encouragement to others who are
working diligently, albeit on a smaller scale, on attempts to preserve
one little aspect of computing, for example the Computer Museum of
Nova Scotia - the Kenbek machine.
Compute on!
Murray--
Regarding the charming wood/metal scale model of a "1401 Data Center" on eBay,
in addition to the 3 1401 Central Processing Units, many of the models are actually
for an IBM 7070: main frame cabinets, console (7150), and card reader (7500).
As a 1401 system, two of the 1401 CPUs are missing their mainspring! ;-)
The IBM 1402, in addition to reading and punching cards,
also delivers AC and DC power to the 1401 CPU, 1403 printer,
and 729 tape string. Technically, the model system is missing two 1402s.
Any large 1401 system would also likely have 1406 extended memory units
(12,000 characters). I suspect many 7070s also had RAMAC/disk
storage units (7300), as did some 1401 systems (1405, 20 MB).
For info and pictures about our two operational tape-based 1401 systems at the
Computer History Museum(CHM), restored by a grand team of retired IBM CE's,
checkout: http://ibm-1401.info/
- Robert
p.s. The CHM just opened to the public its new marvelous Revolution exhibit!
p.p.s. For mounting SMS logic boards, the 7000-series main frame cabinets used large
"Rolygon" sliding gates, while the 1401 used smaller pivoting gate "Cube" packaging.
On Jan 13, 2011, at 10:00 AM, cctech-request at classiccmp.org wrote:
> ------------------------------
>
> Message: 11
> Date: Wed, 12 Jan 2011 20:05:08 -0800
> From: Brent Hilpert <hilpert at cs.ubc.ca>
> Subject: Re: IBM 1401 Data Center
> To: "General Discussion: On-Topic and Off-Topic Posts"
> <cctalk at classiccmp.org>
> Message-ID: <35e182fb8e08dd69eadb310d14d7a288 at cs.ubc.ca>
> Content-Type: text/plain; charset=US-ASCII; format=flowed
>
> On 2011 Jan 12, at 7:35 PM, Curt @ Atari Museum wrote:
>
>> Okay, somebody needs to pick that up, either Al for the CHM or Sellam
>> or Evan.... put that on display, that is just too damned cool !!!
>>
> There have been links for sales of sets like this mentioned on the list
> previously but I think they were folded cardboard, not the detailed
> wood and metal of this set.
>
> The ebay page linked to this:
> http://ibmcollectables.com/360holocaust.html
> Great story, Bob. (.. now we know who to blame)
>
> And speaking therein of 360 front panels:
> ebay 150541712482
> IBM 360/50 front panel goes for $5600.
>
> ------------------------------
>
> Message: 12
> Date: Wed, 12 Jan 2011 22:54:12 -0600
> From: Jason T <silent700 at gmail.com>
> Subject: Re: IBM 1401 Data Center
> To: "General Discussion: On-Topic and Off-Topic Posts"
> <cctalk at classiccmp.org>
> Message-ID:
> <AANLkTikwnRof5-KaoJKDER6+NKnC-ugV84OE703Ny+1_ at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
>> On 1/12/11 7:10 PM, Glen Slick wrote:
>>>
>>> Short on space, power, and cooling? ?Not a problem with this IBM 1401
>>> Data Center:
>>>
>>> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=190490102075
>>>
>>> (I have no connection with this seller or listing)
>
> Awesome - I saw a set like this many years ago (let's say mid-90s) in
> the window of an "antiques" (junk) store in St. Charles, IL. I think
> they wanted around $250 for it, and those were the days I was scraping
> together $5 for meals, so it wasn't going to happen for me. I always
> assumed it was a salesman's kit, for helping to lay our datacenters
> (maybe it came with a big sheet of scaled grid paper to represent
> floor tiles?)
>
> Well, I'll be bidding...
>
> -j
> ------------------------------
