Thanks Haze. I use MAME infequently and didn't know about the romident option, it certainly would have made things easier. I was doing manual comparisons, but I must have compared incorrectly to the base set, which set me off on a tangent. I've re-checked, and as you say this matches the existing "hangon" romset, just with different names. The board does seem to have been converted at some point, but it was HangOn originally as shown by the board labels. I guess it must have been converted back at some point, just with incorrect EPROM labels. Quite odd. At any rate, it's still the case that the current hangon2 set has the IC positions swapped for 6838 and 6839, probably worth fixing up sometime.
By the way, one of the reasons I'm dusting off my arcade collection is I'm planning to start doing some hardware testing on these machines in the near future, to help improve emulation. I did quite a bit of work on the Mega Drive a few years back now, but I'm interested in branching out. My general impression is that a lot of drivers in MAME have been written more by bashing away against the games than from testing and verifying behaviour on the hardware. I'd like to start more fully documenting some of these physical chips, and mapping out all their behaviour in various corner cases by constructing test programs to run on the physical systems, and publishing notes of my findings. At this point I've got most Sega arcade systems starting from the System 1 through to the Naomi 2. I've got a bit of an affinity for the 68000-based platforms, but out of curiosity, if you could pick any Sega arcade hardware to more fully verify its behaviour on the physical hardware, which one would you pick?
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Re: Undumped earlier Sega Hang-On revision
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