Kingston KVR266X64SC25/512 DDR266 512M/64x64 SODIMM Notebook Memory
Specifications:

Mfr Part Number: KVR266X64SC25/512
Type: DDR SODIMM
Capacity: 512 MB
Speed: PC2100 266MHz
Size & Bit: 64M x 64
Pins: 200pin
ECC: No
Registered: No
Chip: Kingston
Cass Latency: 2.5