Konami 051316 reverse-engineering (Patreon)

I've just finished reverse-engineering the Konami 051316 chip.

This one is a ROZ (rotation/zoom) plane generator, which is visually equivalent to the SNES' famous Mode 7. It was used by:

* Ajax
* Bottom of the Ninth
* Chequered Flag (in pair)
* Dive Bomber Squad (in pair)
* Hot Chase / WEC (in pair)
* Over Drive (in pair)
* Rollergames
* Tail to Nose
* Ultraman (3 of them !)
* '88 Games

It's a rather simple chip for such a remarkable video effect.
MAME had everything right except for two undocumented configuration bits that enable tile flipping. These are apparently used by some games since MAME's source mention their existence.
Some other undocumented configuration bits are present but they're either timing or test related, so they really have no use for emulation.

The first half of the new project's goal is now complete. Next is the k053260 sound chip, on which I'll start working in November.

The svg trace, complete gate-level schematics and a verilog implementation along with a simple testbench can be found here: https://github.com/furrtek/VGChips/tree/master/Konami/051316