SCSI: HDI-30
Serial Ports: 1
Sound Output: stereo 16 bit.
ADB: 1
Ethernet: AAUI-15
Machine Gestalt ID: 72
PRAM Battery: service center replacement only

Minutiae:

40 and 56 MB configurations are possible only when a Newer Technology NUpowr with 8 MB onboard, part # 7NU167-8M, or a NUpowr with 24 MB onboard, part # 7NU183-24M are installed.

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. 

9.5” active matrix LCD - 8 bit (64 grays) Display.

One of the configurations sold by Apple contains 12MB of memory.  This configuration requires the removal of the factory-installed 8MB memory module in order to upgrade to a larger capacity memory module.

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

Has 2 MB ROM and a 1.44 MB SuperDrive.