Date: Wed, 20 Oct 2010 14:58:40 -0700 From: David Brodbeck <gull@gull.us> To: FreeBSD Mailing List <freebsd-questions@freebsd.org> Subject: Re: Greybeards (Re: Netbooks & BSD) Message-ID: <AANLkTi=ZO1oJZcqS4xYEZvMkonmt6Uv_VMQKi0HiKiua@mail.gmail.com> In-Reply-To: <4CBF4CB4.6070902@qeng-ho.org> References: <op.vj5o9ixxhtl4zj@ack5833s2.ad.service.osu.edu> <20101017143901.GA71132@current.Sisis.de> <alpine.BSF.2.00.1010171215030.96626@wonkity.com> <20101019074615.GA2183@current.Sisis.de> <alpine.BSF.2.00.1010191448390.6689@wonkity.com> <20101020022946.GA23035@thought.org> <20101020052601.GA1977@current.Sisis.de> <4cbe9e9a.3qT7q8JUqJxSD8/V%perryh@pluto.rain.com> <20101020165526.GA25310@thought.org> <4CBF21EB.1080003@tundraware.com> <20101020194605.GA78565@stainmore> <4CBF4CB4.6070902@qeng-ho.org>
next in thread | previous in thread | raw e-mail | index | archive | help
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.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?AANLkTi=ZO1oJZcqS4xYEZvMkonmt6Uv_VMQKi0HiKiua>