From owner-freebsd-questions@FreeBSD.ORG Thu Oct 21 09:51:18 2010 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 80A32106564A for ; Thu, 21 Oct 2010 09:51:18 +0000 (UTC) (envelope-from jhs@berklix.com) Received: from tower.berklix.org (tower.berklix.org [83.236.223.114]) by mx1.freebsd.org (Postfix) with ESMTP id 09F278FC15 for ; Thu, 21 Oct 2010 09:51:17 +0000 (UTC) Received: from park.js.berklix.net (p549A756C.dip.t-dialin.net [84.154.117.108]) (authenticated bits=0) by tower.berklix.org (8.14.2/8.14.2) with ESMTP id o9L9pFvw085968; Thu, 21 Oct 2010 09:51:16 GMT (envelope-from jhs@berklix.com) Received: from fire.js.berklix.net (fire.js.berklix.net [192.168.91.41]) by park.js.berklix.net (8.13.8/8.13.8) with ESMTP id o9L9p5bm019405; Thu, 21 Oct 2010 11:51:08 +0200 (CEST) (envelope-from jhs@berklix.com) Received: from fire.js.berklix.net (localhost [127.0.0.1]) by fire.js.berklix.net (8.14.3/8.14.3) with ESMTP id o9L9p9OD072604; Thu, 21 Oct 2010 11:51:14 +0200 (CEST) (envelope-from jhs@fire.js.berklix.net) Message-Id: <201010210951.o9L9p9OD072604@fire.js.berklix.net> To: David Brodbeck From: "Julian H. Stacey" Organization: http://www.berklix.com BSD Unix Linux Consultancy, Munich Germany User-agent: EXMH on FreeBSD http://www.berklix.com/free/ X-URL: http://www.berklix.com In-reply-to: Your message "Wed, 20 Oct 2010 14:58:40 PDT." Date: Thu, 21 Oct 2010 11:51:09 +0200 Sender: jhs@berklix.com Cc: freebsd-questions@freebsd.org Subject: Re: Greybeards (Re: Netbooks & BSD) X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 Oct 2010 09:51:18 -0000 Hi, Reference: > From: David Brodbeck > Date: Wed, 20 Oct 2010 14:58:40 -0700 > Message-id: David Brodbeck wrote: > On Wed, Oct 20, 2010 at 1:10 PM, Arthur Chance wrote: > > On 10/20/10 20:46, Bob Hall wrote: > > Getting back to reality, although I never did it (fortunately), a friend of > > mine who was about a decade older than me (I'm mid/late 50s) had the > > experience of programming microcode on a machine by inserting brass slugs > > for 0s and ferrite slugs for 1s on a pin board. Anyone got any idea what > > that was? He was (UK) military so maybe it wasn't a generally known box. > > Don't know about that one, but some early desktop calculators (and I > think some early computerized phone switching systems) used etched PC > boards as ROM. The HP 9100 had 32K of ROM on a 16-layer PC board > using this method. Some Hasler (a Swiss co.) leased telegraph message switching systemss M150 had that too. I designed some cards with DIL switches, After 1975 I think. Cheers, Julian -- Julian Stacey: BSD Unix Linux C Sys Eng Consultants Munich http://berklix.com Mail plain text; Not HTML, quoted-printable & base 64 spam formats. Avoid top posting, it cripples itemised cumulative responses.