You need a 168 pin pc 133 ram for the apple serviced slot (internal slot)
for the user ram slot its a 144 pin pc133 ram ..Max ram is 1 GB installable 😱
The internal slot is a PC133 SDRAM DIMM slot that can accept up to 512 MB of RAM. The external user accessible slot is PC133 SDRAM as well but takes a SO-DIMM with a 512 MB maximum.