Microchip AT28C256-15PU, 256kbit Parallel EEPROM Memory, 150ns 28-Pin PDIP Serial-2 Wire

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EEPROM (E²PROM) memory is non-volatile RAM that has individual byte addressing for data write, unlike Flash which has to be written/erased in blocks . It does have a limited life in terms of number of write cycles and tends to be used for program storage that is infrequently changed.