So what was the custom ROM you mentioned in your earlier post. I.e., how did you modify the ROM?

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I'm just messing around. If I do anything interesting, I'll post it.

But, going through the exercise is similar to what the OP wanted to do.

OP: PM me if you want the ROM splitting code or anything else. Seems like either a 27c256 with the pin lifted or a 27c512 with the rom image duplicated should work for you.