Williams Solved PIN·BOT (Williams, 1986) cpu board U51 I.C. needed

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integrated circuit U51 is bad on my pinbot cpu board. have searched marco and pbresource for replacement. IC on board has '8707 9' and 'EF6821P' stamped on it. looks like schematics list U51 as parts # 6820/6821. couldn't find any 40 pin IC's that reference the #'s i have. Anyone know if there is an IC available as a replacement for my Williams system 11a board - U51. Appreciate any help. Thanks, Phil.
Never mind. I found it at Marco. DUH!!! #6821 IC.
 
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