Looking at some old arcade platformers, I never noticed before how nasty the scrolling is in Bionic Commando (1987), 30fps is nasty for scrolls, blurs whenever you move, this looks like jerky 20fps or lower. Running on a 10MHz 68000 at only 256*224 too, would expect 60fps.
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As an afterthought, there appear to be 8 bytes of scroll registers, handled by the handler "scroll_w", mapped at 0xfe8010. Sounds promising, but it must be in src/mame/video/bionicc.cpp, as it's not in the driver source itself. https://github.com/mamedev/mame/blob/master/src/mame/drivers/bionicc.cpp#L173 …
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Here we have the meat and potatoes of the video, but pretty stingy meat and potatoes they are indeed - other than the PROM-based priority mixer, it seems pretty straightforward, including scroll_w: https://github.com/mamedev/mame/blob/master/src/mame/video/bionicc.cpp … You're right - the game is probably just badly coded.
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