Unidentified Integrated Circuit - NEC 24 Prong

Question

Today I was taking apart an old typewriter and I have this IC that was in a socket. I took it out and started searching online to see what this IC does. I spent 20 minutes and nothing showed up about it. It is a

 NEC 833IE9
 D2364EC 071.  

Any Help?

Answer 1

The question has insufficient information for a definitive answer, a photo would help.

Going by the description of it being a 24-pin device, and that it was socketed (which implies DIP, and also suggests replacement being a maintenance option), it could be this NEC ROM device: nMOS μPD2364, 64 kilobit, 5 Volt TTL ROM, programmed at fabrication by the manufacturer.

Answer 2

A little more info might be helpful. What package? What does it seem to be doing in the circuit? Without really any more detail my first guess would be a.
http://www.alldatasheet.com/datasheet-pdf/pdf/125068/NEC/UPD2364E-1.html
In other words I think it's a rom. I can't find anywhere selling them so nec may not manufacture them anymore. Is it near a micro or an fpga or something?