Is there any books or files that tell what each opart of memmory does? like Dos or apple monitor....I know where certain soft switches are and certain calls..but I want to get down to the heart of the matter and know things like....how exactly does Prodos os Dos3.3 calls work also who are these people when you run this program ? 10 PRINT CHR$(4);"IN#1" 20 INPUT A$ 30 PRINT A$ ?