There were two version of the Portable. The original Portable, released 9/89, came equipped with a non-backlit passive matrix 1-bit (B&W) display. The second Portable, released 2/91, came with a backlit active matrix 1-bit dsiplay.
One memory card expansion slot. In the non-backlit model, upgrades were with 2MB, 4MB, 6MB & 8MB memory cards. In the backlit computers, upgrades were with 1MB, 3MB, 5MB & 7MB cards.
Contains 256K ROMs and the Apple 1.44MB SuperDrive.
Serial Port with the phone icon supports synchronous modems, with handshaking on both the output and input.