SCSI: DB-25
Serial Ports: 2
Sound Output: stereo 16 bit.
ADB: 1
Ethernet: AAUI-15
Machine Gestalt ID: 100
PRAM Battery: 3.6V lithium (Maxell ER3S, Radio Shack 23-026)

Minutiae:

Upgraded with two SIMMs at a time.

Has the Apple 486SX PDS card (see PC Compatibility Card section in GURU for details).  

Has 4MB ROM and a 1.44MB SuperDrive.