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From: edw@cbnewsc.att.com (Edwin.D.Windes@ATT.COM)
Newsgroups: sci.electronics,comp.periphs.printers
Subject: Need help identifying RAM for printer buffer
Keywords: uPD61680
Message-ID: <1990Sep20.151043.4778@cbnewsc.att.com>
Date: 20 Sep 90 15:10:43 GMT
Followup-To: poster
Organization: AT&T Bell Labs, Naperville, IL
Lines: 13

I'm trying to expand the buffer in a Citizen MSP-10 printer.
I popped the cover last night, and there is an empty 28-pin
socket labeled "option buffer" (so far, so good), with a part
number "uPD61680".  The closest part I can find is a NEC 8Kx8
pseudo-static RAM, uPD6168C2.  (I suppose that I could have
misread the number on the board.)

Assuming this is the right part, could I substitute 8Kx8 static RAM?  
Else, where can I get one of these buggers?
And, assuming I fill the socket, do I have to flip some DIP switches?
Does anyone have a manual, or better yet, a schematic for this printer?

thanks.