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

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 -- DECtec mailing list http://dectec.info To unsubscribe from this list see page at: http://dectec.info/mailman/listinfo/dectec_dectec.info