SCSI: none Serial Ports: 1 Sound Output: mono 8 bit. ADB: see below Ethernet: see below Machine Gestalt ID: 102 PRAM Battery: service center replacement only 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” active matrix LCD - 4 bit (16 grays) Display. Has a 152-pin PDS (Processor Direct Slot) connector for connecting to the Duo Docks. Serial Port with the phone icon supports synchronous modems, with handshaking on both the output and input. Has 1 MB ROM.