>It would be nice if these could be added to MAME as a third hangon set but I don't know >whether they'd take them as they're not a full set of roms (obviously missing the >sounds and sprites).
The answer to that should be yes.....especially when he provides actual proof [and appears to have done so]. If it doesn't get added, then at least it should be documented to show an earlier version does exist in case that version needs to be added to the search list. The cab owner should look at this as helping other cab owners preserve the game in case others have same pcb version.
--- The ending sequence is identical in both mine and the hangon/hangon1 sets.
Now because I only have the CPU and control boards it's impossible to know if the sprites that would have been on the sprite board EPROMs and the sound samples/Z80 code that would have been on the sound board are identical to those of the hangon/hangon1 sets but being as though the road/tiles/sprite zoom table all match then I'd go out on a limb and say the other EPROMs would probably also have matched and it's only the main cpu/sub cpu EPROMs that differ. As the chances of mating my board set up with its original sprite board/sound board are virtually nil then I guess we'll never really know the answer (unless someone else, somewhere in the world, has got an original 4-board set with the main cpu/sub cpu code the same as mine!).
So at this point I'm thinking that I might have an early version of Hang-On and started examining the boards closer. The sub cpu EPROMs are labelled with the original Sega labels but are numbered differently than the ones from the hangon/hangon1 set. Mine are labelled epr-6838 and epr-6839 whereas the hangon/hangon1 EPROMs are labelled epr-6919 and epr-6920.
Unfortunately the original labels are no longer on the main cpu EPROMs, they've been removed at some point in their life and replaced with black sticky tape. The board itself has been repaired at some point (looks like 15/8/1995 from the repair sticker) so it's impossible to say whether the original EPROMs were removed and replaced at that time or whether just the labels were removed and black tape stuck on or what! But the fact that these roms all show good in the memory test of the service menu makes me believe this is genuine Sega code.
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