The Macintosh IIsi was the first Macintosh to have at least 1MB of RAM soldered onto the main logic board. Additionally, the IIsi, code named "Ericson" and "Raffica", was also the first Mac to include built-in circuilty for recording your own sounds. These features, amongst others, all fit into a slim, elegant, never-before-seen and never-again-used gray plastic case! Current used market value of a 5/80 configuration: $150