What Apple does differently:

alef-damma is A and M

your p is their B

your S is their c

your D is their C

your d is their d and V

your dh is their D and v

your ' is their e and their G

your gh is their E and their g

your q is their F

your H is their h and X

your kh is their H and x

ya without the dots is their I

your i is their i

the 'che' sound is their J (che as in ahmad chalabi)

the 'gaf' sound is their K

your th is their N and [

your h is their o

ة is O and p

your t is their t and P

ے is U

your sh is their w

the pause diacritical (I can't remember their names) -- ّ -- is their W

your T is their y

your Z is their Y and ]

the persian 'r' with three dots -- ژ -- is their Z

hamza is shift-2. heck, here's 1-8:

١ ! ٢ ء ٣ أ ٤ آ ٥ إ ٦ ئ ٧ ؤ ٨ ى