The characteristic operating memory consisted of 162 trits ( ternary bits ) with an additional 1944 trits on magnetic drum ( total of about 3.3 KB ).
42.
A feature of the Executive operating system was its ability to multi task, using dynamic memory allocation enabled with a magnetic drum as an intermediate random access device.
43.
A consequence of this design was that, unlike other computers with magnetic drums, the G-15 does not retain its memory when it is shut off.
44.
For this role, the delay line was not usable, and the magnetic drum, recently introduced, provided a convenient and easily controlled variable-delay system.
45.
In early computers the number of hours would likely be held on a punch card and the pay rate in some other form of memory, perhaps a magnetic drum.
46.
The prototype machine used 3, 800 vacuum tubes and finally to 30, 000 . } } and stored data for up to 500 objects on a magnetic drum.
47.
When the decision was made to use MAgnetic Drum memory ( MAD ) for the DIDA, the name was lengthened to MADDIDA ( pronounced " Mad Ida " ).
48.
The write-once-read-many optical disk memory would be updated monthly, and recently changed data is held on the re-writable magnetic drum memory.
49.
Karlqvist published his discovery in the 1954 paper " Calculation of the magnetic field in ferromagnetic layer of a magnetic drum " at Royal Institute of Technology ( KTH ).
50.
The Binson Echorec, another popular unit, used a rotating magnetic drum or disc ( not entirely unlike those used in modern hard disk drives ) as its storage medium.
