Memory Type: SDRAM, PC133, SDRAM (non-ECC)
Maximum Memory: 288MB
The 256 MB module can be used only if the iBook Firmware Update has been installed; otherwise, a 128 MB module is the largest capacity.
Memory or DRAM is the "working" memory of the computer. It's used to store data for programs (sequences of instructions) on a temporary basis.
video - installing memory