INT 15 - DOS/V - FONT SUBSYSTEM ACCESS AH = 50h AL = which function address to retrieve 00h "read font" function 01h "write font" function BL = 00h BH = character size (00h single-byte, 01h double-byte) DH = width of character cell DL = height of character cell BP = code page (see #00470) Return: CF clear if successful AH = 00h ES:BX -> requested function's address CF set on error AH = error code (see #00471) SeeAlso: AH=49h