Supported System Software: 7.1.2P, 7.5, 7.5.1, 7.5.3
SCSI: DB-25
Serial Ports: 2
Sound Output: stereo 8 bit.
ADB: 1
Ethernet: use Newer Technology 7ET-L10, 7ET-L10/100, 7ET-C10 or 7ET-C10/100
Machine Gestalt ID: 98

Minutiae:

Apple sometimes advertises this as a 66 MHz machine, since the clock speed is doubled inside the processor chip.  However, all I/O to the processor is done at 33 MHz. 

Has a Communication Slot for network cards and modems.

Has a Video System Slot for a video capture card.

Has a Video/TV System Slot for a cable-ready television tuner.

Serial Port with the phone icon supports synchronous modems, with handshaking on both output and input supported.

Has 1MB ROM and a 1.44MB SuperDrive.