Supported System Software: 7.1, 7.1.1, 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
Machine Gestalt ID: 89

Minutiae:

Apple sometimes advertises this as a 50 MHz machine, since the clock speed is doubled inside the processor chip.  However, all I/O to the processor is done at 25 MHz. 

Requires symmetric memory.  This is only an issue when dealing with SIMMs which use 16Mb chips.  SIMMs built with symmetric chips are indicated by an "L" suffix on the part number.

Original Enabler: 065

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.