Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.1 6/24/83 (MC830713); site vu44.UUCP
Path: utzoo!linus!decvax!genrad!wjh12!harvard!seismo!mcvax!vu44!jack
From: jack@vu44.UUCP (Jack Jansen)
Newsgroups: net.lsi,net.wanted
Subject: Re: HELP!  What are these chips?
Message-ID: <495@vu44.UUCP>
Date: Thu, 15-Nov-84 11:15:29 EST
Article-I.D.: vu44.495
Posted: Thu Nov 15 11:15:29 1984
Date-Received: Sat, 17-Nov-84 05:34:37 EST
References: <357@mako.UUCP> <1636@wateng.UUCP> <251@spp2.UUCP> <3373@rochester.UUCP>
Organization: The Retarded Programmers Home, VU, Amsterdam
Lines: 30

Well, about the use of chips found in Radio Shack collections :
The best use for them is usually either an Inclusive-Allways
or an Exclusive-Never gate.
Below is a print layout for use with 14 pin chips. I leave it to
your own imagination how to make a print for chips with another
number of pins.

Gnd  o---+-+-+-+-+-+-+---o (a)
	 | | | | | | |
	 O O O O O O O
		     (b) o----o Output
	 O O O O O O O
	 | | | | | | |
Vcc  o---+-+-+-+-+-+-+---o (c)
By inserting a jumper from (a) to (b), the circuit functions as
an Exclusive Never gate, and by inserting one from (b) to (c)
it is an Inclusive Allways gate.
Another use is to put a jumper from (a) to (c), in which case
the circuit becomes a Protected power supply protection tester.

By the way: It doesn't really matter where you put pin 1 of the
chip, since the design automatically adapts to IC's that are
put in backwards.
-- 
	Jack Jansen, {seismo|philabs|decvax}!mcvax!vu44!jack
	or				       ...!vu44!htsa!jack
  "Only the great masters of style ever succeed in being obscure"
			Oscar Wilde, 1894.
  "Most unix(tm) programmers are great masters of style"
			Jack Jansen, 1984.