Slot Machine 85c64-20

Cmndr Brain

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What is a 85c64-20 by NDK. It looks to be an eprom or a security chip. Anyone know? Pinout?
 
I picture or some more information might help. Sometimes digits can be mis-read (S vs 5, 8 vs B, etc.) and/or faded.
Other information can also be of value narrowing things down, like what eqiupment it is in (or came out of), any date code or other information on the IC. The size and type (DIP, QFP, etc., number of pins).

If it came up with a simple google search, I'm sure you wouldn't already done that. This may take a little more effort.
 
Needless to say, I don't have the machine anymore. I have since found the problem and fixed it. Although here is a similar chip. Everything I've research is all in Japanese or restricted access. I did find one screenshot on a Japanese auction site that showed hex code. Seems as though it should be "readable". Still don't know. Now, it's more of just curiosity.
hollup_899_1_d_20221112121425
 
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