If you press the tilt button in MAMETM Operation Bear does not reset itself, but the original bootleg board does.
Also since the bootleggers had to reproduce the custom chips from Taito I have found the bootleg board uses the following four same resistors to generate the red, green and blue colors.
220, 470, 1K and 2.2K
Kevin Eshbach
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Some issues with Operation Bear (Operation Wolf bootleg)
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