Memory. Im needing a memory stick for my acer travelmate 270 and Im not sure what Im looking at to

Question

Im needing a memory stick for my acer travelmate 270 and Im not sure what Im looking at to do this.

ddr is all ive been told to look for when searching for ram or something.

 

my email: [e-mail] if you could please respond to this email address.

 

regards

Mandy