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From: rrw@naucse.cse.nau.edu (Robert Wier)
Newsgroups: sci.electronics
Subject: PROM <-> EPROM cross ref?
Message-ID: <2654@naucse.cse.nau.edu>
Date: 9 Oct 90 22:13:19 GMT
Organization: Northern Arizona University, Flagstaff AZ
Lines: 37


 The campus observatory here has asked for help with the 
 following problem:

 Due to a close lightning strike, a number of pieces of equipment
 were zapped (telescope guidance, etc).  Things have been put
 back together except for a PROM which is suspect.  There are
 two other similar PROM sets can be compared against, IF we
 can get parameters on how to read it.  We have an EPROM programmer
 which could possibly be used to read the old PROM and program
 a new EPROM.  However, other than the pin out, we don't have
 a clue as to compatibility between the old PROM and currently
 available EPROMs.  I've tried checking the IC Master, but
 have drawn a blank there.  I wonder if anyone can come up
 with a cross reference on the following:

        MMI 6336 (believe its 256 x 8)
                and now may be an AMD part

                63S285 which is supposed to be equivalent
                to the 6336...

 I'd GREATLY appreciate any help in getting a cross reference to
 a EPROM (if one exists...) that would be a drop in replacement
 for the PROM.

 THANKS!


 - Bob Wier

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                      College of Engineering
         Northern Arizona University / Flagstaff, Arizona
  Internet: rrw@naucse.cse.nau.edu | BITNET: WIER@NAUVAX | WB5KXH
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