Date: Thu, 21 Oct 2010 13:27:43 -0400 From: Henry Olyer <henry.olyer@gmail.com> To: RW <rwmaillists@googlemail.com> Cc: freebsd-questions@freebsd.org Subject: Re: Greybeards (Re: Netbooks & BSD) Message-ID: <AANLkTik9micq=nJJR5B=b8ENgCVL-CXNtOO6vefT52iJ@mail.gmail.com> In-Reply-To: <20101021155724.0eb1c5a1@gumby.homeunix.com> 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> <20101021133844.235fdc72@gumby.homeunix.com> <4CC040E7.7090404@qeng-ho.org> <20101021155724.0eb1c5a1@gumby.homeunix.com>
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My first machine was an IBM 1620, but hey, at least we had an actual disk. A couple of 2311's. To quote a fellow I used to consult for, two days' I had solved a particularly nasty programming problem for his company, "But what have you done for us lately?" On Thu, Oct 21, 2010 at 10:57 AM, RW <rwmaillists@googlemail.com> wrote: > On Thu, 21 Oct 2010 14:32:23 +0100 > Arthur Chance <freebsd@qeng-ho.org> wrote: > > > On 10/21/10 13:38, RW wrote: > > > On Wed, 20 Oct 2010 21:10:28 +0100 > > > Arthur Chance<freebsd@qeng-ho.org> wrote: > > > > > > > > >> 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. > > > > > > I wonder why it was brass/ferrite rather than brass/empty or > > > ferrite/empty. > > > > Dredging up physics unused for 30+ years, ferrite is ferromagnetic > > and intensifies magnetic fields so a coil of wire with ferrite inside > > is a massively bigger inductor then an empty coil. I vaguely remember > > that brass is slightly diamagnetic, but could be mistaken. If it is, > > then it would have the opposite effect and reduce the inductance, so > > you'd get a better difference in signal between brass/ferrite than > > air/ferrite. > > Possibly. I'm wondering if there might be three states, where the third > state is writable. > > > Air/brass would give very small differences in signal, > > I was thinking in that case it would be open/short circuit. > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to " > freebsd-questions-unsubscribe@freebsd.org" >
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