What engineers will do to avoid one 74138. On Tue, Nov 19, 2013 at 9:51 PM, Clay Cowgill <c.cowgill@comcast.net> wrote:

I was blowing off the Mask ROM possibility thinking that there was no way Who Dunnit had enough of a run to merit mask, but now that I think about it that makes sense-- although it's not mentioned in the MAME driver comments, Who Dunnit 1N is actually the same as Crossbow, Combat, and Catch-22... So that makes sense to be mask after all. (And it'll probably be identical to those.)

-Clay

-----Original Message----- From: techtoolslist-bounces@flippers.com [mailto:techtoolslist-bounces@flippers.com] On Behalf Of Rodger Boots Sent: Tuesday, November 19, 2013 6:02 PM To: Technical Tools Mail List Subject: Re: [Techtoolslist] Can anyone identify this chip?

OK, here we go. Teeray nailed it. Datasheet attached, just need to strap pins 26 & 27 to whatever the game uses to access this part and read it as a 2764.

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