 The machine came standard with 64 KB RAM, with the equivalent of a built-in Apple Language Card in its circuitry, and had a new special "Auxiliary slot" (replacing slot 0, though electronically mapped to slot 3 for compatibility with earlier third-party 80-column cards) for adding more memory via bank-switching RAM cards.Through this slot it also includes built-in support for an 80-column text display on monitors (with the addition of a plug-in 1K memory card, via bank-switching of 40 columns) and could be easily doubled to 128 KB RAM by alternatively plugging in Apple's Extended 80-Column Text Card.As time progressed, even more memory could be added through third-party cards using the same bank-switching slot or, alternatively, general-purpose slot cards that addressed memory 1 byte at a time (i.e.