for as many revolutions of the drum as needed by the hardware.

Hardware implementation

The logic circuitry of the 305 was built of one- and two-tube pluggable units and relays.

Related peripheral units

A basic system was composed of the following units:

* IBM 305 - Processing unit, the magnetic process drum, magnetic core register and electronic logical and arithmetic circuits
* IBM 350 - Disk storage unit
* IBM 370

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