Archived posting to the Leica Users Group, 2015/10/21
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Having not known much (if anything) about Babbage until this series of posts, I listened to a programme on BBC Radio 4 yesterday about Ada Lovelace who was closely associated with him, although maybe not as closely as she would have liked. Strange how these things suddenly come together. Gerry > On 20 Oct 2015, at 23:04, Herbert Kanner <kanner at acm.org> wrote: > > Hi Larry, > > If you?re local to the Computer History Museum, maybe we can meet there > some time. I?ve been volunteering there since about 2003 or whenever it > was that they moved from Moffat Field to the ex-Silicon Graphics building. > I?m a docent, and do the talking part of the Babbage Engine demo at 1 pm > on almost every Saturday. > > Herb > > Herbert Kanner > kanner at acm.org > > Question Authority and the authorities will question you. > >> On Oct 20, 2015, at 12:25 PM, Larry Zeitlin via LUG <lug at >> leica-users.org> wrote: >> >> Herbert,From Wikipedia?s article on magnetic core memories: >> "Two key inventions led to the development of magnetic core memory in >> 1951. The first, An Wang's, was the write-after-read cycle, which solved >> the problem of how to use a storage medium in which the act of reading >> erased the data read enabling the construction of a serial, >> one-dimensional shift register of o(50) bits, using two cores to store a >> bit. A Wang core shift register is in the Revolution exhibit at the >> Computer History Museum. The second, Jay Forrester's, was the >> coincident-current system, which enabled a small number of wires to >> control a large number of cores enabling 3D memory arrays of several >> million bits e.g. 8K x 8K x 64 bits.? So I guess we are both right. >> >> >> Now back to the Leica S. A toy for the very rich. >> >> >> Larry Z >> >> >> _______________________________________________ >> Leica Users Group. >> See http://leica-users.org/mailman/listinfo/lug for more information >> > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information