20 Oct
2019
20 Oct
'19
7:58 a.m.
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:
--
- db at FreeBSD.org db at db.net http://www.db.net/~db
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!
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