>From: "Roy J. Tellason" <rtellason at blazenet.net>
>
>On Friday 20 January 2006 02:57 pm, J.C. Wren wrote:
>> <URL: http://www.cs.pdx.edu/~harry/Relay/index.html >
>
>What's missing there is sound files, for when the thing is operating... :-)
>
>
Hi
I don't think he mentions the memory size.
Dwight
Great! Thanks Al, and the person that provided them!
I will download them tomorrow and print them.
I have a day off, to pick up an 11/34 with a LAB-11 and ... an RK07!
BTW, I have uploaded the RK07 printset in 4 parts, total 100 Mb.
- Henk.
________________________________
Van: cctalk-bounces at classiccmp.org namens Al Kossow
Verzonden: wo 25-01-2006 04:41
Aan: classiccmp at classiccmp.org
Onderwerp: RK611 schematics
now up at
http://www.bitsavers.org/pdf/dec/unibus/MP00105_RK611_schem_Aug77.pdf
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Thank you for your cooperation.
While looking for my cache of PMC MO disks, I stumbled on a box with some
NOS memory modules. I think I got these when I bid on a mixed lot of old
memory modules that had one that I really wanted.
I found 2 2MB and one 8 MB module for what I believe should be a Compaq
LITE4. These are about the same size as a PCMCIA card, but with offset
contact rows (in contrast to a PCMCIA card).
I've also got a 4MB and an 8MB short (about 2" long) 72-contact SIMM. One
is labeled "21xx Memory" if that's any help.
I've also got another small 8MB memory module about 2"x1" with two 30-pin
female headers on each end of one side.
Anyone have a need for these or even know what they are?
Cheers,
Chuck
>From: "Chuck Guzis" <cclist at sydex.com>
>
>On 1/24/2006 at 10:18 PM ard at p850ug1.demon.co.uk wrote:
>
>>How about using uniselectors and having decimal (or octal) memory ?
>
>I suppose you might also include some Strowger switches for address
>decoding...
>
>Back when I was in high school (a very long time ago), a fellow built a
>tic-tac-toe "computer" using stepping relays and other telephone gear,
>including a rotary dial where one input one's move. (only 9 possibilities,
>so that was convenient). The contraption would make its own move in
>response. Readout was a 3x3 grid of 25W incandescent lamps.
>
>It was fun to watch.
>
>Cheers,
>Chuck
Hi
A fellow I know named Ed McLaughlin built one that took him
to the national science fair. I don't know if it is the same
one but this was in the early 60's some time.
Dwight
Marty
I saw your posting regarding 990/10A boards, do you know of anyone who
can repair or supply these boards. We have a number of faulty ones.
Regards
Richard Norman
hi -by name is rdewan --do you still have the manual for heathkit 3400
trainer i am looking for one -please let me know at rdewan at crh.org-thanks
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All,
way behind on my digests, sorry for the time-warped reply.
At 12:00 -0600 1/5/06, Chuck wrote:
> >Why not Shockley diodes? Anyone remember the Shockley demo of a diode-only
>>audio amplifier back in the 60's?
...and my nomination for hobbyist research is: Balanced
trinary! (Possibly using superconductors and SQUID detectors.)
Balanced trinary means place values go up by three each, but instead
of each place containing symbols worth 0, 1, or 2 times the correct
power of 3, the symbols are worth (-1), 0, or 1 times that power.
Using the letter n for the (-1) symbol, a short counting table is:
BT Decimal
...
nn -4
n0 -3
n1 -2
0n -1
00 0
01 1
1n 2
10 3
11 4
1nn 5
1n0 6
1n1 7
10n 8
100 9
101 10
...
No need for a negative sign bit, it's built in. Each memory
cell needs to hold 3 states, which for superconducting loops should
be clockwise, no, or counterclockwise current.
Of course, you could simulate this using 2 binary gates to
carry each trinary digit - thus wasting 25% of the practical power of
your computer (compared to implementing it as base-4). But if Moore's
law holds up, that'll only set you back about 3 months compared to
conventional binary computers....
Hope at least some of you are laughing by now.
Practical applications *do* exist. You can get a long way
with just a few weights (one each power of 3) and a balance scale
using this system, for example. "n" weights go on the platform with
whatever's being weighed, "1" weights go on the other side.
--
- Mark
210-522-6025, temporary cell 240-375-2995
Hello,
Erlangen University in Northern Bavaria, Germany, is about to
dispose of some old computing equipment from the departments
of Electrical Engineering and Materials Science:
-several (10 +-) HP 700/RX colour X-Terminals, complete with
HP Sync-on-Green monitors, cables, HP-HIL Keyboards and Mice.
Comes with tower stand.
-some (5 +-) HP 712/100 Workstations, complete with
HP (VGA?) Monitors, cables, HP PS/2 Keyboards and Mice.
Comes with tower stand.
-a couple HP apollo 9000/? (600? 700?) Workstations
(narrow tower or wide pizza box), complete with
HP Sync-on-Green monitors, cables, keyboards and mice.
These are all upgrade throws and therefore were working until shut
down (except for one 712/100). Software to boot the X-Terminals is
available on http://www.cb3rob.net/~sven/xterm/, for example.
I'll be saving some of the stuff for the museum and some more for
myself, but of course I can't take the whole load. However as I
don't want it crushed, I offer to put aside and store what you
promise to pick up. Shipping may be possible, but we're trying to
avoid it at the moment.
ATTENTION: even if the X-terminals and HP 712/100 have VGA style
monitor connectors, DON'T try any ordinary VGA screen on them!!!
My personal 700/RX (b/w variety) has blown one of my fairly modern
VGA monitors (although it worked with a different one), so be sure
to check the supported frequency ranges! Best take a monitor that
comes with it.
Hope to hear from you,
--
Arno Kletzander
Stud. Hilfskraft Informatik Sammlung Erlangen
www.iser.uni-erlangen.de
10 GB Mailbox, 100 FreeSMS/Monat http://www.gmx.net/de/go/topmail
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Sridhar Ayengar <ploopster at gmail.com> wrote:
> Mark Tapley wrote:
> <SNIP>
> > Of course, you could simulate this using 2 binary gates to carry
> > each trinary digit - thus wasting 25% of the practical power of your
> <SNIP>
>
> I think you need to call it something other than "trinary digit" because
> that contracts to "tit".
>
> Peace... Sridhar
Hmm, not quite. According to the documentation of Malbolge (an esoteric
programming language specifically designed to be difficult to program
in and using trinary "arithmetic"), that's "trit".
The specification is here: http://www.antwon.com/other/malbolge/malbolge.txt
So long,
--
Arno Kletzander
Stud. Hilfskraft Informatik Sammlung Erlangen
www.iser.uni-erlangen.de
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