V22.0436 - Prof. Grishman

Lecture 20:  Memory Technology

Early technologies: delay line; magnetic core (dominant mid-50's to mid-70's) (text, section 7.9)

Primary technology today: transistor RAM (text, pages B-26 to B-33)

static RAM:

dynamic RAM: For some applications, memory does not have to change --- use ROM (read-only memory).

Static and dynamic RAM are both volatile: data disappears when power is lost. For some applications, data must be preserved, so a special (slow) non-volatile RAM is used.

Spring 1999