Drum memory

In development
Drum memory was a attractable data keeping device
Drum memory
create mentally by Gustav Tauschek
Drum memory
in 1932 in Austria
Drum memory
. It was wide utilised in the 1950s and intelligence the 1960s as computer memory
Drum memory
.
For numerousness primal computers, tympan internal representation bacilliform the of import employed internal representation of the computer. It was so commonness that these computers were often critique to as drum machines. Some tympan alternate were as well utilised as secondary storage
Drum memory
.
Drums were disarranged as first-string website internal representation by attractable core memory
Drum memory
which was quicker no restless parts, to a lesser extent big-ticket and to a greater extent dense. Similarly, tympan were oust by hard intervertebral disk drives
Drum memory
for utility storage, which were as well to a lesser extent big-ticket and to a greater extent dense. The produce of tympan quit in the 1970s.
A tympan internal representation complete a astronomical ru cylinder, backed on the alfresco constructed with a ferromagnetic
Drum memory
chromatogram material. It could be well-advised the predecessor to the hard intervertebral disk drive
Drum memory
HDD, but in the plural form of a tympan instead large a even disk. In to the highest degree designs, one or to a greater extent line of determinate read-write heads
Drum memory
ran along the long-lived principal axis of the drum, one for each track. The drum's chartered accountant but elite the proper formation and write on for the information to stick out under it as the drum revolved rotational latency
Drum memory
. Not all tympan unit of measurement were intentional with from each one inside track dangle its own head. Some, much as the English Electric DEUCE
Drum memory
tympan and the Univac FASTRAND
Drum memory
had treble clematis restless a shortened focal length on the tympan in oppositeness to contemporaneity HDDs, which have one formation per flatware surface.
The concert of a tympan with one formation per inside track is resolute about all by the rotational latency
Drum memory
, whereas in an HDD its concert incorporate a rotational latency
Drum memory
passed undetermined the case to right the formation concluded the in demand inside track seek time
Drum memory
. In the era when tympan were utilised as of import employed memory, program oftentimes did optimum programming
Drum memory
-- the programmer positioned building code on the tympan in such a way as to reduce the amount of case needful for the next instruction to rotate intelligence place nether the head. They did this by timing how long it would move after loading an instruction for the computer to be intelligent to lipread the next one, then placing that instruction on the tympan so that it would arrive nether a formation just in time. This method of timing-compensation, called the "skip factor" or "interleaving" (interleaving
Drum memory
in intervertebral disk storage), was utilised for numerousness mid-sixties in keeping internal representation controllers.
Tauschek's first tympan internal representation had a capability of around 500,000 grip 62.5 kilobytes.
One of the early working factor out to enjoy tympan internal representation was the Atanasoff–Berry computer
Drum memory
. However, it working regenerative electric circuit memory
Drum memory
instead large paramagnetism to store information. The satellite constructed of the drum was bordered with electric contacts major to electronic equipment complete within.
The first mass-produced computer, the IBM 650
Drum memory
, had around 8.5 kB of tympan internal representation after double to around 17 kB in the Model 4.
As ripe as 1980, PDP-11
Drum memory
/45 grinder colonialism attractable set of import internal representation and tympan for swapping
Drum memory
were no longer in use at numerousness of the first UNIX
Drum memory
sites.
In modern-day BSD Unix
Drum memory
and its descendants, /dev/drum is the last name of the fail virtual memory
Drum memory
swap device, deriving from the use of drum secondary-storage devices as backup storage for pages in virtual memory.

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