On Sun, Oct 20, 2019 at 10:45:27AM -0400, Nigel Johnson via cctalk wrote: > I remember an IBM engineer talking about this at our ham radio club. The
de VA3DB > wire was coiled inside a drum and pulses were sent down the wire. The > 'read head' was a magnetic pickup at the other end of the coil - and This sounds like delay line memory. Lot's of info on this on web. > access time was however long it took the pulse to arrive at the other > end. Therefore storage capacity was inversely proportional to data > quantity, however at that time I was working with 660kB Univac FH330 > drums for swapping and the 2-ton Fastrand for 164kB of long-term > storage, so it has to be taken in context! > > Although the read was actually non-destructive, the pulse had to be > regenerated to go around agaiun. > > Is that maybe what you are thinking of? > > cheers, > > Nigel > > > On 20/10/2019 10:35, dwight via cctalk wrote: > > I was just listening to a video on the Voyager space craft. It used an > > interesting type of memory, called magnetic wire memory. There is only a > > little bit of information of it on the web. It is clever in that has a > > non-destructive read. I just wondered if any one else was familiar with > > this type of memory. > > Dwight > > > > > > > -- > Nigel Johnson > MSc., MIEEE > VE3ID/G4AJQ/VA3MCU > > Amateur Radio, the origin of the open-source concept! > > > You can reach me by voice on Skype: TILBURY2591 > > If time travel ever will be possible, it already is. Ask me again yesterday > > This e-mail is not and cannot, by its nature, be confidential. En route from > me to you, it will pass across the public Internet, easily readable by any > number of system administrators along the way. > Nigel Johnson <nw.john...@ieee.org> > > > Please consider the environment when deciding if you really need to print > this message > > -- - d...@freebsd.org d...@db.net http://www.db.net/~db
