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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 …
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.
Thanks to MAME's core tilemap system, it's only a couple hundred lines long, and I'm almost 100% certain you can pretty easily infer the whole functionality of it. But if you have any questions, feel free!
I feel like trying the ZX Spectrum version again to see which has a higher framerate I'm that shocked. Not that software scrolls are easy at such low MHz. Nice to see some detective work btw :D
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