There is a well know issue that Robotron is harder to play on MAME emulation than the arcade machine because the arcade machine game play timing bogs down when there are too many sprites to move, redraw, and keep track of after 9 waves when the arcade machine tries to speed up the pace.
So Tank Waves, Brain Waves, pretty much everything gets harder and more aggressive with MAME after wave 9 than on the arcade machine. To me (and others) the arcade machine is more fun as a result.
This not a matter of CPU speed because slowing down the CPU does not replicate how the game play timing changes when the hardware is bogging down under load. I read in one place it had to do with how the blitter chip operates under heavy load. The Roboton Pros will understand what I am talking about.
Does anyone know if there are any emulators for Mac or PC that play Robotron with the same game play timing as the arcade machine ? Again this is not a CPU speed issue but instead the fact that the emulator needs to simulate how the chips themselves bog down under load.
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