How do ya get the code?

[ECMnut at aol.com]

Hey gang,

 My friend is having "CHECK ENGINE" light blues on a 94 GrandAmm.
The Diacom doesn't work with the 94 & newer OBD stuff.

Can someone tell me how to get, and interperate the
 error code that is stored?  If it means sending me to a website
somewhere, that's okay.  I know you can get it to blink the 
check engine light, and count the flashes, then look the up the
code, yada...

Not sure how to do it on a vehicle that is this new.
TIA
Mike V.