IBM Thinkpad T21 2647-8BS memory
Maximum Memory: 512mb
Base Memory: 128mb (Removable)
Upgrade Sockets: 2 (2 banks of 1)
64Mb Part Number: 20L0254, 20L0264
128Mb Part Number: 20L0255, 20L0265
256Mb Part Number: 33L3069, 33L3070
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