When you do a show hardware in 3800 router,
you get one line like:
Cisco 3825 (revision 1.0) with 487424K/36864K bytes of memory.
What is these two number accurate meanings?
The First Number : 487424K
It represents the "main memory"
The Second Number : 36864K
It represents the "IO memory" ( shared memory)
So it has total of : 512 MB of memory .
HTH...rate if helpful..