Alt-BEAM Archive
Message #01582
To: Hans Tolboom h.tolboom@stud.tue.nl, beam@corp.sgi.com
From: dennison dennlill@buffnet.net
Date: Wed, 17 Mar 1999 16:30:42 -0500
Subject: [alt-beam] Re: Why use a 4 / 6 Nv MicroCore in a walker ? (Newbie)
?Sure, for one, the Microcore is Analog. Not digital, which allows for tons
of other stuff. Also you can influence each Nv output independenlty. As far
as I know, you can play with the clock for a shift register, but not much
else.
Dennison
>Hello,
>
>I'm a bit new in the BEAM principle and I'm trying to figure
>out the MicroCore. As a starting point I've use the site of
>Andrew Miller, 'How to make a walker'.
>
>To explain it he used a 6 Nv microcore circuit like this :
> ---
>1 -| |- 4
>2 -| |- 5
>3 -| |- 6
> ---
>
>The MicroCore has 4 states :
>
>1 - saturated state
>2 - Two process state
>3 - Single process state
> '1' does 1->2->3->4->5->6->1-> etc.
> the rest is '0'
>4 - Null state
>
>For a two-motor walker all you need is a circuit with 4 Nv's.
>To walk the Microcore has to be in the single process state.
>
>To me this behaviour looks a lot like the behaviour of a 4
>bit shift register like a 74hc194 (up/down shift). If you
>you change the wiring to
> 1 = Qa 3 = Qb
> 2 = Qc 4 = Qd,
>the walker will walk in the same way as with a 4 Nv net.
>The only difference between a 4 Nv and a 4 bit shift is that
>the 74hc245 can provide itself with a puls-generator and the
>4 bit shift needs an external (NE555 ?) controlled puls-
>generator.
>
>Can anyone explain to me what the real advantage of a nervous
>net (used for a walker with 2 or 3 motors) is compared to
>something like a 4 (or 8) bit shift reg. ??
>
>
>
> thanks, Hans
>
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