Alt-BEAM Archive

Message #06837



To: Beam Mailing List beam@sgiblab.sgi.com
From: Elmo andrewe@ilid.com.au
Date: Mon, 18 Oct 1999 13:33:10 +1000
Subject: [alt-beam] Head Questions


Hi everyone

Elmo the un-knowledgeable here again to rack your brains for
information.

I have a few questions that have popped up whilst i have been looking
into building a head unit.



1) Most people seem to be using the 74HC240(inverting octal 3 state
buffer) for their heads rather than the 74HC14(Hex inverter with schmitt
trigger input) which seems to get used a lot more in walkers. Is there a
reason why the HC420 is better for head units than the HC14?

2) Can i build a standard 74HC14 type biocore for use in a head unit?

3) Why use a biocore at all for this application. Wouldn't a simple
solar engine with phototropic abilities and a mechanism for inverting
the output to the engine so it can go in reverse, be sufficient?

4) It's hard to tell from most web pages if head units are geared or
not. Anyone know?


Thanks again for your help

Elmo

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