AVR-Chat

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>Will the code writen for the AT90 be almost the same as the code for 
>the AVR ?  Is my using an assembled boards based on the AT90S2313 a 
>good idea ? or should I be more interested in using AVR devices ?

The AT90 is an AVR.  The 2313 is a lower end AVR, but capable.
My favorite starter chip is the 2343, a little of everything.


>Is there a basic that will handle both ? would a C program need a 
>simple alteration, or a major re-write ?

Basic, C, and assembler are all very different animals.