Archived posting to the Leica Users Group, 2015/10/20
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]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 >