G'day Ray,
At first glance, your description of the difference between 2716 mother
boards and 2732 mother boards looks complete and accurate. The only
part that I can't say I've seen is the J10-4 to PG0 cut, but it makes
sense to me.
I think you have a flaw in your reasoning when you suggested putting
2716s into a board that was meant (or modified) to use 2732s. When you
put the 2716s into the mother board that uses 2732s, then pin 21 on
the 2716 will fluctuate between ground and +5v as the extra wiring
mods cause that pin to change state! I believe that pin 21 on a 2716
(CS2) MUST stay grounded for the 2716 to work....when I was working
with 2564s I had trouble until I tied the CSs to either ground or +5v!!
I think my assumption that the signal from the extra wiring mods
fluctuating is fair, since there's no reason that the hardware would
hold that signal steady if the code in the 2716s doesn't even realize
the extra wiring mods exist.
In any case, I think you already know what the solution to the problem
is since you read my Cinematronics conversion document. After you've
upgraded your Rev K board to run Armor Attack, you'll have to also burn
some 2732s with double copies of Rip Off (and another set of 2732s with
double copies of Star Castle if you want to plug those into the modified
Rev K mother board somewhere down the line), so that no matter what
signal is coming from the extra wiring mods, the high address line will
still select either the first copy of the Rip Off program or the second
copy of the Rip Off program....and since the programs are exactly the
same, the Rev K mother board will find what it needs!
Tell me how it goes!
Steve Ozdemir
