While doing deprecat.h clean-ups (basically conversion of irq systems in old drivers) I’ve stumbled across one of my oldest nemesis … Chequered Flag by Konami. After some grinding of my teeth and a LOT AND HALF of DASM code studying, I’ve finally nailed it down, it was mostly a rather silly bug with the protection device, checking that a check was true on a port by checking that all the bits were high instead of just one like one could imagine …

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Note: I’m not entirely sure that the protection is COMPLETELY emulated, if you know the original game and notice something wrong just let me know via the public channels, thanks in advance.

This entry was posted on Friday, April 29th, 2011 at 3:28 am and is filed under Mame Wip. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed.