SCSI: DB-25 Serial Ports: 2 Sound Output: stereo 16 bit. ADB: 1 Ethernet: none Machine Gestalt ID: 512 PRAM Battery: 4.5V alkaline (Rayovac 840) Minutiae: Upgraded with one DIMM at a time. Can be accelerated with Newer Technology's 512KB Cache DIMM, part # 7CC512C. Although you will not derive any performance benefits by using EDO DIMMs, they can be used in this machine. The part numbers in the GURU ram configuration table are for EDO DIMMs. Has 4MB ROM and a 1.44MB SuperDrive.