It is the other way round. The AD&D computer games were build after the PnP-roleplaying game. The first PnP was D&D, and it was designed long before crpgs were even heard of (ok, may be some early programs for some guys on unix-computers). After D&D the AD&D rules were published. There are 2 Editions, and the game system is almost identical to the D&D-system.
The last edition (its number is 3rd) now is called D&D again, but the game system has almost nothing in common with the old one.
Chris
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