The ds is not totally pin for pin so some pins need swapping around, just connect pins of the same label to each other such as a16 to a16. It's also offset, there are a few unused pins on the memcal, one being the rw pin which you now use. The ds does not have vpp as its programmed via 5v.
If you don't want to make it up I do sell kits minus the ds1245.