Finished off Metal Freezer driver, started during the 0.173 dev cycle. It is a 1989 game by Seibu, which used Dark Mist HW as base with more tiles / colors and some minor address lines swapping (a cliché for this manufacturer, so for example you won’t ROM swap between boards).
There are still few bits not understood in the video registers section, and how rowscroll/raster effect really works is a mystery. Latter is assumed to divide the status bar from the main playfield during gameplay, I’ve assumed that a bit is directly correlated but can’t say for sure due of the limited use that the game does.

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