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opt2not

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I have a Lifeforce US pcb that I’m looking to convert to the Japanese version.
From what I’ve read there are 6 ROMs needing to be replaced: 1x 27C128, 1x 27C256, 2x 27C512s and 2x mask ROMs (TC531000P) that are 28 pin 1Mbit that is hard to find.
System11 has a good solution for substituting the 2x mask ROMs with 1mbit flash TSOP32 format ROMs on an adapter board. http://blog.system11.org/?p=1871

But I was wondering about the other ROMs, what are the locations for these?
Anyone know?
 

ShootTheCore

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The System 11 Link you posted has a picture of the final converted board and where the new EPROMs are installed.

EB5132D7-B079-4EE8-8A28-543A0556F3F1.jpeg
 
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