2A1F:0100 1E PUSH DS 2A1F:0101 31C0 XOR AX,AX 2A1F:0103 8ED8 MOV DS,AX 2A1F:0105 BE1704 MOV SI,0417 2A1F:0108 8A04 MOV AL,[SI] 2A1F:010A 24DF AND AL,DF (Change this mask for Caps & Scroll 2A1F:010C 8804 MOV [SI],AL Lock as well) 2A1F:010E 1F POP DS 2A1F:010F CD20 INT 20