One memory expansion port. Special adaptor is required for memory modules.
The PowerBook 150 appears to be a rather typical all-in-one notebook until you examine the motherboard. The PB 150 eschews the standard Apple all-in-one motherboard, using in its place a slight variation of a Duo 230 motherboard. It uses standard PowerBook Duo memory modules, but it employs a standard PowerBook all-in-one AC power adaptor.
Contains a modem expansion slot, SCSI Port (internal hard drive is IDE), and one serial port.
Does not contain an ADB port, video-out port, or ethernet port.