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From: s_loewer
Newsgroups: comp.periphs.printers
Subject: HP Deskjet RAM module information
Message-ID: <90.248.11:01:18@ira.uka.de>
Date: 5 Sep 90 17:58:25 GMT
Sender: news@ira.uka.de (USENET News System)
Reply-To: s_loewer
Organization: University of Karlsruhe, FRG
Lines: 20


  Hello DeskJet Users !

  Does anyone have got a description of the hardware of a
  DeskJet+ RAM module (128 or 256 kb).
  Or a description of the pins of the two 40 pin connectors.
  The information that I have is, that the original RAM module
  contain static RAMs (62256/43256 perhaps).  So the glue logic
  shouldn't be too difficult.
  A cheaper approach would be simply two  mega-chip 514256 with a
  certainly more complex glue logic to build up an 256 kb RAM module.
  The essential supposition would be a REFRESH signal at the 40 pin
  connector.


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  Jochen Loewer
  internet    s_loewer@irav1.ira.uka.de
  bitnet      uk6d@dkauni2.bitnet
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