workin on buying an eMac

[gallagb]

i'm gettin it from a guy who doesnt' know much about it

Machine Model: eMac
CPU Type: PowerPC G4 (3.3)
Number Of CPUs: 1
CPU Speed: 1 GHz
L2 Cache (per CPU): 256 KB
Memory: 256 MB

80GB HD
superdrive


not sure which machine this is-
rev b, c, or d
how do i find out?

how easy is it to add more ram to this machine?
what about boost the HD?
this one takes an airport extreme card right?
easy to put in?

any site where i can go to find out all that info? etc?

thanks!