Laptop,IBM ThinkPad T42, Pentium (R) M Processor. @1.70GHz ,512 MB RAM, No HDD, DVD-ROM , Windows XP Professional Licence Sticker, No Charger, Appears To Function [92882+23]
IBM ThinkPad T42 Memory Replacement - iFixit Repair Guide
How to upgrade memory in IBM ThinkPad T40 T41 T42 – Inside my laptop