MEM-2900-1GB Compatible Dram memory Upgrade for CISCO ROUTER 2901 2911 2921 1 GB - Newegg.com
Repair of a Cisco 2960G switch with amber LED via RAM chip replacement (FAIL/defect) - YouTube
Back to the basics: Cisco device Memories
CMS 512MB (1X512MB) DDR1 2100 266MHZ ECC Non Registered DIMM Memory Ram Upgrade Compatible with Cisco® 2821 Router System for Server Only - B106 at Amazon.com