While fixing some sound related issues in WEC Le Mans 24/Hot Chase HW, I’ve got across a code snippet that was stealing a lot of cycles in Hot Chase. Turned out that Master CPU was checking for an hand-shake bit from sound CPU after sending a sound command data and an irq request line, and looping to a pretty fat chunk of time until eventually timing out if the default state is ‘1’ (which was default behaviour so far).  Fixing that, and gameplay speed finally normalized for good.

This entry was posted on Wednesday, November 25th, 2015 at 1:55 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.