The Dungeonmaster (1984)

"Paul, a computer whiz who spends more time with his machine than with his girlfriend, finds that he has been chosen as a worthy opponent for Mestema, an evil wizard who has spent centuries searching for a challenging foe. After having his computer changed into a wristband weapon, Paul battles with a variety of monsters before finally coming face to face with the ultimate adversary."

RIP Richard Moll

https://www.imdb.com/title/tt0089060/?ref_=ext_shr_lnk

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