Int 15 Fn 22 - System - Later Ps/2s - Locate ROM BASIC [B] AH = 22h Return: CF set on error AH = status (86h if function not supported) CF clear on success AH = 00h ES:BX -> ROM BASIC Note: if this function is not supported, ROM BASIC is at F600h:0000h See Also: INT 86"BASIC",INT F0"BASIC"