Atari's first portable version of the Atari ST line of computers, the STacy gave Atari users the freedom to carry (ok, lug...) their work with them.   Although monsterous by todays 2.6lb to 5lb average laptop weight, the STacy was loaded with a lot of features.   One important feature was its built-in MIDI ports.   The STacy became the musicians choice of computers because of its size and features.