Installed on an IBM ThinkPad T60 laptop recently “upgraded” to 2GB of RAM. Catching up on updates since my retail copy is the day 1 release and does not include SP1. :
T60 after CPU upgrade : r/thinkpad
ThinkPad T series - Wikipedia
IBM Thinkpad T60 RAM Replacement - iFixit Repair Guide
Lenovo ThinkPad T60 15.4" Mobile Workstation - Intel Core 2 Duo T7600 2.33 GHz - Black - Newegg.com
Does the ThinkPad T60 support a maximum of 3 or 4GB RAM? - Quora
Tutorial: Upgrade ram in IBM T42 Thinkpad - YouTube
Lenovo IBM T60 SSD, RAM, and CPU Upgrade - YouTube
IBM Thinkpad T60 RAM Replacement - iFixit Repair Guide