IBM ThinkPad R50e 15" Laptop Pentium M 1.60GHz 512MB 0HD NO PSU | eBay
IBM R52 Thinkpad: How to Remove and Upgrade RAM Memory Module - YouTube
CMS 2GB (2X1GB) DDR1 2700 333MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with IBM Lenovo® Thinkpad R50E Notebook Series Ddr1-Pc2700 - A49 at Amazon.com
IBM ThinkPad R40 15“ | Intel Pentium M 1,7GHz | 1256MB RAM | ATI Radeon 7500 | 80GB HDD : r/thinkpad