SCSI: DB-25 Serial Ports: 2 Sound Output: stereo 16 bit. ADB: 1 Ethernet: AAUI-15 Machine Gestalt ID: 40 PRAM Battery: 3.6V lithium (Maxell ER3S, Radio Shack 23-026) Minutiae: Upgraded with two SIMMs at a time. Level 2 cache is upgradable. Upgrades are no longer available from Newer Technology. Serial Port with the phone icon supports synchronous modems, with handshaking on both output and input supported. Has 4MB ROM and a 1.44MB SuperDrive.