> For context, i'm using mame-rr-0144-test0 for debugging and whatnot, please let me > know if it's impossible on that revision or how i can go about doing this if not.
If the "0144" is indicative of the version of MAME that it was built off of (0.144), then that version of MAME came out approximately a decade ago. There have been a number of improvements to the CPS3 driver since then that you're going to be lacking.
Is there a particular reason why you're not choosing to edit the source of the latest official version of MAME instead?
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