On Sat, Feb 9, 2013 at 4:31 PM, Jordi Guillaumes i Pons <jg at jordi.guillaumes.name> wrote: DS1287A Poking it around it looks like the DS1687 is reasonable replacement. http://www.jameco.com/Jameco/Products/ProdDS/781134.pdf http://pdf1.alldatasheet.com/datasheet-pdf/view/115535/DALLAS/DS1287A.html The 1287A was a replacement for a Moto part used in the IBM PC: There is an app note on how to replace it, which is what made me look at the DS1687. http://www.jameco.com/Jameco/Products/ProdDS/25101.pdf Dallas semi says the 1687 is SW compatible with the 1287A which I think is what you need to care about and then maybe a little HW hacking, although it looks fairly close. Needs to check any timing differences and the name of the RW/WR pin is different - but they >>might<< work the same way (might also need to be inverted). Clem