>> In fact I didn't find any reference to the chip numbers you
>> mentioned. But be aware of the possibility that the codes 9051 and
>> 9052 can be production data, i.e. the weeks 51 and 52 of 1990.

SK> It's 9051, so you're suggestion that these are production dates makes
SK> sense.
SK> There's a few more numbers on each chip - I doubt it'll help a lot if 
SK> these are custom chips, but who knows...

SK> NEC:
SK> 9051PD
SK> 7538AC044 1380753801

SK> National Semiconductor:
SK> +B9052
SK> MM58241N

You are not lost, there is a datasheet for the second one, which is
the actual display driver:
http://www.national.com/pf/MM/MM58241.html



Uwe

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