Japanese model which is functionally a 540c with a cool jet black case. One memory expansion port. 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. This Mac contains 2048K ROMs, and the Apple 1.44MB SuperDrive. Serial Port with the phone icon supports synchronous modems, with handshaking on both the output and input. Sound output is 16-bit stereo. Contains an international power supply. Contains an LC-style Processor Direct Slot (PDS).