INT 15 - CASSETTE - WRITE DATA (PC and PCjr only) AH = 03h CX = number of bytes to write ES:BX -> data buffer Return: CF clear if successful ES:BX -> byte following last byte written CF set on error AH = status (see #00409) CX = 0000h SeeAlso: AH=00h"CASSETTE",AH=02h"CASSETTE"