What's the Name of That Book??? discussion

Im looking for a book i read in late 80's/early 90's in paperback. The genre was sci/fi. It was based in an arab/middle eastern setting. The protaganist had reciever slots in his head that could accept implant's that i think were called "dadis" maybe that changed his abilities and such. Thanks in advance for the help.

When Gravity Fails? From wikipedia:
Where most others have their brain "wired", for work or play, Audran's almost superstitious dread of this modification has prevented him from doing the same, and so he cannot use "daddies" (from "add-ons", software chips providing skills like languages or accounting) or "moddies" (modules that contain whole new personalities, for example those of movie stars or fictional characters).

IIRC, he gets his brain "wired" later on.

thats it! thanks