Oh, I should mention the Sega H1 hardware that was used for Cool Riders, it seems like it's just as capable as System 32, with some features even close to ST-V etc. and the display list system is closer to what I'd expect to see in a 3D system like Model 2.
Everything in that is a pure guess at the moment, a lot of the private buffers eg. sprite ram might actually be CPU visible, just being written indirectly as the 2 things we have on the hardware do things in rather different ways.
It seems to be one of the more fascinating pieces of Sega hardware, a possible final attempt at a Sprite Scaler board before they realised nobody wanted 2D sprite scalers any more.
I'm curious what that hardware could actually do if pushed to the limits.
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