In order for a 2620XM ro recognize 256MB DRAM, you need BOOTROM version 12.2(8r) and IOS version 12.3(11)T. For upgrading from 96MB to 256MB DRAM, you would need two 128MB DRAM DIMM and a bootrom w/12.2(8r) if your current bootrom is lower then this version.
Basically, your current 96MB DRAM can not be used as the 2620XM motherboard has 2 DRAM slots only and you would need 2 x 128MB DIMMs.
Here are the part numbers:
1. MEM2600XM-128D= 128 MB DIMM DRAM for the Cisco 2600XM Series
2. MEM2600XM-128DBOT= 128 MB DRAM and Boot ROM for Cisco 2600XM Series
(This is required if your current bootstrap code is lower then 12.2(8r). Upgrade the IOS to atleast 12.3(11)T aswell).
Upgrading System Memory, Internal Flash, and Boot ROM in Cisco 2600 Series Routers
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