Return-Path: Received: (qmail 4028 invoked from network); 23 Jan 2002 16:34:07 -0000 Content-Transfer-Encoding: 8bit Received: from unknown (HELO warrior.services.quay.plus.net) (212.159.14.227) by exhibition.plus.net with SMTP; 23 Jan 2002 16:34:07 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 26896 invoked from network); 23 Jan 2002 16:33:40 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior.services.quay.plus.net with SMTP; 23 Jan 2002 16:33:40 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 16TQAO-0001pG-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 23 Jan 2002 16:22:28 +0000 Received: from tomts8.bellnexxia.net ([209.226.175.52] helo=tomts8-srv.bellnexxia.net) by post.thorcom.com with esmtp (Exim 3.33 #2) id 16TQAN-0001pA-00 for rsgb_lf_group@blacksheep.org; Wed, 23 Jan 2002 16:22:27 +0000 Received: from server1.sympatico.ca ([216.209.138.142]) by tomts8-srv.bellnexxia.net (InterMail vM.4.01.03.16 201-229-121-116-20010115) with ESMTP id <20020123162137.UYQG16860.tomts8-srv.bellnexxia.net@server1.sympatico.ca> for ; Wed, 23 Jan 2002 11:21:37 -0500 Message-ID: <5.1.0.14.0.20020123111503.00af6ec0@POP2.sympatico.ca> X-Sender: b1aemm59@POP2.sympatico.ca X-Mailer: QUALCOMM Windows Eudora Version 5.1 Date: Wed, 23 Jan 2002 11:21:19 -0500 To: rsgb_lf_group@blacksheep.org From: "Larry Kayser" Subject: Re: LF: RE: SMT Devices In-reply-to: <7D653C9C42F5D411A27C00508BF8803DCB9976@pdw-mail-r1.dstl.go v.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: >Andy: >There was a techniques described a couple of years ago for using these chips >dead bug style. Mount the chip upside down on a piece of unetched PCB. >Bend the grounding pins down and solder directly to the groundplane. This is how I built my first Intel 4004 back in 1972. My list of opcodes was a type written list and it took three months work to get this little darling to print out the first "A" on an ancient Chicago Teletype Corp Model 33 printer. Three more months and some additional memory it was controlling the OSCAR VI satellite for me (which I did for over 5 years hi). We had raging debates in a local eatery on the use of the different opcodes. We set the clock with 74121's with a scope and pots, with the two phase overlapping timing used to drift and eventually the thing would stop working at times. Dead bug work here goes back a long way hi. It takes a lot of courage to work for weeks and then turn it on to see if you "got it right"!!!! Larry VA3LK