PCA problem in R

Dear all:

When I have more variables than units, say a 195*10896 matrix which has 
10896 variables and 195 samples. prcomp will give only 195 principal 
components. I checked in the help, but there is no explanation that why 
this happen. Can we get more than 195 PCs for this case? Thank you very 
much.

Best!
Alan
Aug-12-2005