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I have measured the M6809 and Z80 clock frequencies on an original board. Find the scope snapshots attached. The M6809 EXTAL is set at 8MHz (vs 6MHz in srumbler.cpp) and the Z80 clock is 4MHz (vs 3MHz in srumbler.cpp)
The base crystal is 16MHz, so the frequencies of 8 and 4MHz make sense
The M6809 is halted while the sprite buffer is copied (130us, this reduces the effective speed of the CPU). The halt process is likely to be triggered by the CPU with a write at a given address, like in other CAPCOM games of the same era.
Finally, the aspect ratio looks quite different when coming out of the PCB
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happppp commentedon Apr 5, 2021
According to cabinet photos, the aspect ratio is similar to MAME.
srumbler: correct xtal/cpu speed [jotego]