On Monday 26 November 2007 13:26, Randy Dawson wrote:
> Date: Mon, 26 Nov 2007 13:15:02 -0500> From:
ray at arachelian.com> To: >
> Subject: Re: *updating* 8088's> > Roy J. Tellason wrote:> > On
Friday 23
> November 2007 19:05, dwight elvey wrote:> > > >>> From:
> rtellason at verizon.net> >>>> >>> I notice that even those
guys that are
> building relay computers "cheat"> >>> and use a single small
solid-state
> chip for RAM. :-)> >>> > >> Hi> >> I've been
thinking about how one could
> make a reasonable> >> memory, using small reed relays. If one puts a
> magnet close> >> to one end, it will cause the reed to close. Move it
> back> >> some and it will hold until the field is too weak.> >>
> ..> >>
> > Dunno if they still sell them or not, but Radio Shack used to sell a
> pack of > > 20 reed switches for only a couple of bucks...> >> >
> >
> Hmm... Wonder if it's possible to build a relay without a spring on the >
> switch. That is, you have to send current with one polarity to set the >
> switch to a 1 and reverse polarity to set a zero - sort of what core >
> memory does with rings... I suppose this could instead be done by >
> attaching a magnet to the switch, or using magnet as the thing inside >
> the switch body, or better yet maybe a relay with a ball with a set of >
> contacts as the switch and two magnets, one on each opposite side... >
> you'd energize one coil for a "1" and the other for a "0"
> > Hmm, could
> even be done with a solenoid and use the mechanical part of > it to touch
> a wire for output. :-) Wouldn't really be a relay, but > pretty close.>
>
Ack! :-)
Teledyne makes a 'non volitale' relay. its
tradename is Maglatch.
They did some pretty impressive stuff. I had some one time that were in an
8-leaded TO-5 Can, DPDT with a transistor driver and diode in there with it.
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin