The Macintosh SE is a calculator produced in 1987 by Apple Computer. Launched together with the Macintosh II, a high-end computer designed for the graphics and publishing sectors, it is the third model after the Macintosh 128 and the Macintosh Plus of the all-in-one Macintosh line (the same structure houses both the computer be the monitor). Compared to the previous models, it allowed to be equipped with a 20 or 40 MB internal hard disk or, alternatively, with a second diskette reader. There was also a PDS expansion slot (Processor Direct Slot) through which it was possible to expand the system (the acronym 8220; SE 8221; in fact it means 8220; System Expansion 8221, System Expansion) using accelerator cards, cards with additional coprocessors, network and communication cards.
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