Bad EEPROM on 11/84

John A. Dundas III dundas at caltech.edu
Tue May 24 09:59:15 CDT 2005


I could use the collective wisdom of the list.

I have an 11/84 (M8190) with what appears to be a bad configuration 
EEPROM.  [The symptoms are that at boot the system attempts to boot 
and immediately drops into ODT rather than testing memory and the 
setup menu.  Replacing the EEPROM with a known good one from another 
board cures the problem.]  I'm trying to learn more about the EEPROM 
but haven't had a lot of luck yet.  It appears to be a Xicor X2816AP, 
24-pin, DIP.  This seems to be a 2k x 8bit EEPROM, but I haven't 
found out much else yet.  I would like to find a replacement for the 
EEPROM.

Two questions:

1) Any recommended sources for such parts out there?

2) Any suggestions on how to initialize it?  Perhaps just leave it 
zeroed?  Or copy a known good one?

Thanks,

John



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