Supported System Software: 7.1.1, 7.5, 7.5.1, 7.5.3 SCSI: HDI-30 Serial Ports: 1 Sound Output: stereo 16 bit. ADB: 1 Ethernet: AAUI-15 Machine Gestalt ID: 72 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. 9.5” color active matrix LCD - 16 bit (thousands colors) 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. Original Enabler: PowerBook 500 series enabler 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.