[DECtec] [HECnet] VAXstation 4000/VLC clock battery?

[Maciej W. Rozycki]

On Sat, 24 Jan 2015, Mark Wickens wrote:

Yes DS12887A is the right part number. Or search online how to cut the 
top off and add your own battery. These are generally available on eBay 
from China as well.

NB the original is actually a DS1287A rather than a DS12887A.   While 
being pin compatible they are not identical and the difference between the 
two is the latter has 128 bytes of internal addressable locations while 
the former only has 64 bytes, and consequently ignores the value of bit #6 
written to the address register.   So hope that no clever software relies 
on that bit being ignored before assuming a DS12887A can replace a 
DS1287A!

  Maciej

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