Reading, writing, erasing flash (16F88)

[RussMartin]

Did you mean AND?

Either AND or NOR...one of the two. Either way, in the end, it looks to me like something is broke

Now I get it; you're testing me, right?

Nope, sorry; NOR won't do it, either. To repeat my earlier examples, if $F is the "erased" value in the location and the value $A is to be written:

%1111 OR %1010 returns %1111, so the value in the location is unchanged.

%1111 AND %1010 returns %1010, which is the desired result.

But . . . since the only case when NOR returns 1 is as the product of two 0s:

%1111 NOR %1010 gives %0000 (!)

In fact, anything NORd with $F or $FF or $FFFF is going to be . . . 0!

The winner, still the reigning champion, is AND