Quick laptop memory chip compatibility question -- should be easy

Hey all,

I have a quick question. I have an extra 256mb chip for my HP
Pavillion zt1175. According to the chip, it's "256mb of DDR 266mhz
PC2100". I have a friend who has a IBM ThinkPad T21. It looks like
the IBM takes sdram I just wanted to know if there is any way that my
memory will work in his laptop (as far as compatibilty goes). . I
looked at several websites, but I don't know about any backward
compatibility issues, or anything like that.....it gets comfusing.
Here are a few links that may help:

Memory specs for HP zt1175:
http://reviews.cnet.com/HP_Pavilion_...8.html?tag=dir

Memory specs for IBM ThinkPad T21:

http://www.unitedcomputers.com/ibm_t...t21WIN2000.htm

http://www.shoplaptop.net/3-ibtht281-64.html


Thanks guys, we appreciate it!

M
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