[musashi5150]

Originally Posted by pbareges

but in the above code, it says dc.l 1 reserves 1 long variable...it is not consistent with your explanation right? or to be more precise what is the difference between constant and static vars ?

EQU is used for contants that never change
DS.x is used to Define Storage (uninitialised) - you can change this when running
DC.x is used for Define Constant (initialised) - you can change this when running

Example:

        ds.b    4    ;Reserves 4 bytes storage (contains random trash data)
        dc.b    4    ;Reserves 1 byte storage and puts the value '4' into it
beefy   equ     4    ;Reserves NO storage, but you can use the word 'beefy' to mean 4 in your program code...