SCSI: DB-25 Serial Ports: 2 Sound Output: mono 8 bit. ADB: 2 Ethernet: none Machine Gestalt ID: 49 PRAM Battery: 3.6V lithium (Maxell ER3S, Radio Shack 23-026) was used in some revisions of the logic board. 4.5V alkaline (Rayovac 840) was used in later revisions of the logic board. Minutiae: Upgraded two SIMMs at a time. Although up to 12MB of RAM may be installed, only 10MB is usable. Serial Port with the phone icon supports synchronous modems, with handshaking supported on the output, not the input. Has 1MB ROMs and a 1.44MB SuperDrive.