Date: Thu, 21 Oct 2010 11:51:09 +0200 From: "Julian H. Stacey" <jhs@berklix.com> To: David Brodbeck <gull@gull.us> Cc: freebsd-questions@freebsd.org Subject: Re: Greybeards (Re: Netbooks & BSD) Message-ID: <201010210951.o9L9p9OD072604@fire.js.berklix.net> In-Reply-To: Your message "Wed, 20 Oct 2010 14:58:40 PDT." <AANLkTi=ZO1oJZcqS4xYEZvMkonmt6Uv_VMQKi0HiKiua@mail.gmail.com>
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Hi, Reference: > From: David Brodbeck <gull@gull.us> > Date: Wed, 20 Oct 2010 14:58:40 -0700 > Message-id: <AANLkTi=ZO1oJZcqS4xYEZvMkonmt6Uv_VMQKi0HiKiua@mail.gmail.com> David Brodbeck wrote: > On Wed, Oct 20, 2010 at 1:10 PM, Arthur Chance <freebsd@qeng-ho.org> 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.
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