From owner-freebsd-smp Mon May 1 15:34:25 2000 Delivered-To: freebsd-smp@freebsd.org Received: from freeway.dcfinc.com (cx74889-a.phnx3.az.home.com [24.1.193.157]) by hub.freebsd.org (Postfix) with ESMTP id A15C937B970 for ; Mon, 1 May 2000 15:34:18 -0700 (PDT) (envelope-from chad@freeway.dcfinc.com) Received: (from chad@localhost) by freeway.dcfinc.com (8.8.8/8.8.8) id PAA18008; Mon, 1 May 2000 15:33:58 -0700 (MST) (envelope-from chad) From: "Chad R. Larson" Message-Id: <200005012233.PAA18008@freeway.dcfinc.com> Subject: Re: hlt instructions and temperature issues In-Reply-To: <200005011814.LAA01684@gndrsh.dnsmgr.net> from "Rodney W. Grimes" at "May 1, 0 11:14:39 am" To: freebsd@gndrsh.dnsmgr.net (Rodney W. Grimes) Date: Mon, 1 May 2000 15:33:57 -0700 (MST) Cc: dr@dursec.com, kpielorz@tdx.co.uk, djb@ifa.au.dk, smp@csn.net, smp@FreeBSD.ORG Reply-To: chad@DCFinc.com X-Mailer: ELM [version 2.4ME+ PL40 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-freebsd-smp@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org As I recall, Rodney W. Grimes wrote: > Right along with the chain breaking/hammer bank smoking code for the > 1403 printers.... basically a very specific sequence of lines with > very special character sequences could cause 1/3 of the hammer bank to > fire every 14uS or so, do that for more than 10 cycles or so and you > could litterly break the print character chain. De-optimize it for > chain breaking and run it for 10 minutes and you would start smoking > the hammer coils.... Ah, yes. I had one that would play "The Iowa Fight Song" (I was working for Collins Radio in Cedar Rapids at the time--circa 1969). Worked best with a single sheet of paper, and the paper thickness set for 6-part forms (very rattley). And the feed clutch open, so you could use "line feed" as a drum-beat. We had a printer controller (built by Collins, the 8401 I believe) that would allow you to gang printers, in case you needed more than 6 copies. Get five or six printers going and you could hear the song all over the building. I seem to remember one of my cow-workers wrote "On Wisconsin" as well. But shattering the chain was pretty spectacular. You'd want to be sure the covers were down or someone could get hurt. The IBM CEs loved us. Sometime I should tell you about making the Bryant disk drives walk across the floor... -crl -- Chad R. Larson (CRL15) 602-953-1392 Brother, can you paradigm? chad@dcfinc.com chad@larsons.org larson1@home.net DCF, Inc. - 14623 North 49th Place, Scottsdale, Arizona 85254-2207 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message