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Refactor the display to use a buffer of the size of the total margins.
Remove the deprecated MCFG_SCREEN_REFRESH_RATE().
Try to synchronize the CPU on the vertical sync generated by mame
calling the screen_update() function.
Instead of a fixed CROM/CRAM configuration defined through macros,
make this a machine configuration parameter. You can now choose
between the 3 setups:
1 = 1K CROM, 1K CRAM, 1 S register bank
2 = 2K CROM, 1K CRAM, 1 S register bank
3 = 1K CROM, 3K CRAM, 8 S register banks
TODO: Some games which used to work in Salto do no longer work with
this driver, e.g. pacman7 from the allgames.chd
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