Need NS MM5740AAE/N keyboard encoder

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Joined: May 28 2005
Posts: 1

I tried replacing the dead National Semoconductor MM5740AAE/N keyboard
encoder chip on this Datanetics keyboard with an MM5740AAC/N thinking the
C might just be some minor revision or whatnot and shouldn't make a
difference. Well, I'm not sure if there is some greater thing wrong with
this computer, but the keys don't map properly:

Key => 1 2 3 4 5 6 7 8 9 0 : -
Chr -> R F ^ A I U Y M C O S K

D'oh! I can't find any data for this chip. Does anyone know if in fact
the AAC is different from the AAN? Anyone got data?

Anyone got a spare MM5740AAE/N?