Boot up the router, go to the enable prompt (at the "Router>" prompt, type in "enable" and press enter, the prompt should change to "Router#" --- or it may have a name asigned, the important part is the "#" is enable mode).
At the Router# prompt, type in "Show Version".
The output wil give you memory count (flash and ram) and the hardware list (how many of what kind of interfaces).
If you don't understand the output, cut & paste it into another post here.
Good Luck
Scott