Toshiba Portege M400-3G143 Tablet PC (Intel Core 2 Duo T5500 1.66GHz, 512MB RAM, 60GB HDD, 12.1" TFT, Windows XP Tablet PC Edition 2005) : Amazon.co.uk: Computers & Accessories
How to upgrade RAM in Toshiba Portege M400 – Inside my laptop
4GB (2GBx2) Team High Performance Memory RAM Upgrade For Toshiba Portege M400-S933 M400-ST4001 M 400-ST4035 M400-ST9113 Laptop. The Memory Kit comes with Life Time Warranty. at Amazon.com