> There's an unmapped write to address $e803 in Super Locomotive.
Good sleuthing! Since Super Locomotive is an early-80s game, these writes may have something to do with "cabinet enhancements" seen more often in the early days of arcades than the later ones. Think of things like lamps (maybe behind a marquee) that may flash when a bonus round is completed, or coin lockout switches once a game starts. Schematics would be best, but if you can find an image of the cab, maybe something will stand out?
Also, Zsolt seems to document some unusual behavior with the video chip (the part about a single bit messing with the palette for red / purple cars) - these bits you've found could also do funny things to a palette chip, so another possibility is looking for unemulated video features on a real board versus what happens in MAME. Bits like these sometimes come in the form of wire-mods on limited-run PCBs as well, so the info may not even be in the schematics.
Unfortunately the rarity of this board makes that tough, but guessing is part of the fun  .
/Andrew
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