Interchangeability of a 6809(P) & 6809(EP)?

joemagiera

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From what I've read, the 6809EP has some clock circuit and the 6809P doesn't, so if you have a game that uses a 6809EP, you can't replace it with a 6809P.

But what about the opposite direction? Can you substitute in a 6809EP for a game that originally used a 6809P? I can't find any reference to this situation.
 
6809(P) has XTAL/EXTAL inputs for a crystal oscillator and outputs the E and Q clocks.

6809E(P) requires an external clock generator, so E and Q are inputs.

They're most definitely not interchangeable.
 
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