X61, still a great writing/ second machine after all these years : r/ thinkpad
Lenovo ThinkPad X61 Hard Drive Replacement - iFixit Repair Guide
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2GB Memory RAM Upgrade for the Lenovo Thinkpad R61 Series, T60 Series, T61 Series, X60 Series and X61 Series Laptops (DDR2-667, PC2-5300, SODIMM) at Amazon.com
How/Where to place 3G - SIM Card in Lenovo X61 tablet pc? - video Dailymotion