Question about Apple ][ ROM chips!

[sark314@hotmail.com (Charles Forbin)]

I recently acquired two original ]['s.  The motherboard on one is
copyright 1978 and starts in Applesoft BASIC even with the Language
Card removed.  The motherboard ROM chips are also copyright 1978
(there are tiny stickers on them).  I once read that the presence of a
certain single pin in the upper right corner of this board makes it a
"Revision 1" board, so I think that's what this is.  The handwritten
number in the upper left corner is 8001.

The second ]['s motherboard is copyright 1979 and looks slightly
different from the other board.  There's a lot less green and more
brown.  In the '78 motherboard, there were a few chips alongside the
left side that each said "16K 16K 16K" (under the label "MEMORY
SELECT"); they are not present here, nor does it look like there ever
was a place for them.  The single pin I mentioned from the other board
is also not here.  The number in the upper left is 8031.  I haven't
tested this unit to see if it starts up in Applesoft without the
Language Card.

Basically, I'm trying to verify the authenticity of these machines.  I
know that, on an original ][, one could access Applesoft from the
Language or Firmware Cards, or load it from disk or cassette, but was
it possible to physically replace the motherboard Integer BASIC ROM
chips with Applesoft chips?  I'm also wondering what the chance is
that either motherboard is in fact a ][+ motherboard.  I know the ][+
was released in 1979, but does that mean its motherboards would only
have copyright dates from '79 onward?