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<br />The storage section of the Model 1604 is a large-
<br />capacity magnetic core storage system providing
<br />hign-speed, non-volatile, random-access storage
<br />for 32,768 48-bit words. One 48-bifi word may
<br />contain either a 48-bit data word or two 24-bit
<br />instructions. The read access time, i.e., the time
<br />from request of data to delivery of data from stor-
<br />age, is 2.2 microseconds.
<br />The 32,768 48-bit word magnetic core storage
<br />section of the 1604 computer is controiled by a
<br />t.vo-phase timing system, each pF ase controlling
<br />one-half (16,384 — 48-bit words) of the total stor-
<br />aoe. All odd storage addresses reference one stor-
<br />age unit, and al► even addresses reference the
<br />other storage unit. The read access time of each
<br />section is 2.2 icroseconds after which, without
<br />delay, the ne,�. arithmetic operation is in�tiated.
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<br />Each unit has a total storage cycle time of
<br />6.4 microseconds. The storage cycles of the two
<br />sections overlap one another in the execution of
<br />a program, with the result that the effective cycle
<br />time is 3.2 microseconds when addresses of al-
<br />ternate memory banks are referenced. Average
<br />effective cycle time for random addresses is about
<br />4.8 microseconds for a representative program.
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