Supported System Software: 7.0.1, 7.1, 7.1.1, 7.5, 7.5.1, 7.5.3
SCSI: DB-25
Serial Ports: 2
Sound Output: mono 8 bit.
ADB: 1
Ethernet: none
Machine Gestalt ID: 23

Minutiae:

The Classic II can only be upgraded to 10MB.

Serial Port A supports synchronous modems, with handshaking supported on the output, not the input.

Has 512KB ROM and a 1.44MB SuperDrive.