Misc: In computing terminology, what does D.P.I. stand for?

Questions

In 1977 Pope Paul VI makes 19th-cent bishop John ---------- first US male saint.?

In 1978---------- , famous cat (big fat hairy deal), born.?

In 1986 Artificial heart recipient Murray P. Haydon died in---------- , KY.?

In 1402 Battle of ---------- (Ankara)-Tatars defeat Turkish Army.?

In 1791 King Louis ---------- caught trying to escape French Revolution.?