Salve at all of you, during the compilation I obtain a warnin message. I know it is only a warning but i prefer to avoid. I have written the routine for bank switching as is written on the manual. Someone can know the way to solve this strange problem. Attached please find the source and the error file. Thanks Ciao Leonardo Content-Type: application/octet-stream; name="Ledn.err" Content-Disposition: attachment; filename="Ledn.err" Attachment converted: wonderland:Ledn.err (????/----) (00003182) Content-Type: application/octet-stream; name="Ledn.asm" Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="Ledn.asm" Attachment converted: wonderland:Ledn.asm (????/----) (00003183)