INT 15 - SYSTEM - READ/MODIFY PROFILES (CONVERTIBLE)
	AH = 40h
	AL = subfunction
	    00h get system profile in CX and BX
	    01h set system profile from CX and BX
	    02h get internal modem profile in BX
	    03h set internal modem profile from BX
Return: CF clear if successful
	    AH = 00h
	CF set on error
	    AH = status (80h = profile execution failed)