These new PowerBooks have two memory expansion slots for main memory expansion. The system can be upgraded, up to 384 Mb maximum. The system's memory expansion slots have a height restriction on the memory expansion boards. The bottom slot allows only a 1.5 inch low profile memory module and the top slot allows only a 2 inch high memory module. The system can be upgraded up to 384 Mb of main memory by installing 128 Mb low profile DIMM in the bottom memory expansion slot and 256 Mb high profile DIMM in the upper memory expansion slot.
Trans Intl offers 32 Mb, 64 Mb and 128 Mb low profile memory modules for the top and the bottom memory expansion slots meeting Apple's 1.5 inch height limitation and 128 Mb and 256 Mb high profile memory modules for the top slot meeting Apple's height limitation of 2 inches. (See also TIL article #58325.)