UPDATED 2015/06/07The OPK
Update to most recent source code (2015/06/06):
-[Core/CD] improved PCM chip & Gate-Array area mirroring
-[Core/CD] improved CDC emulation (fixes random freezes during Jeopardy & ESPN Sunday Night NFL intro)
-[Core/CD] added CD-AUDIO & CD+G support
-[Core/CD] fixed OGG file seeking when using with CUE file
-[Core/MD] added support for Tom Clown (Realtec/Unlicensed)
-[Core/MD] fixed Game Genie / Pro Action Replay lock-on support when Mega CD hardware is enabled
-[Core/VDP] optimized tile caching
Changed icon by popular demand.
Added speedup option with balanced and performance settings.
Added analog "deadzone" configuration.
Lots of code optimisation
Disabled Lock-on for a few games with copy protection which fail to load if Lock-on enabled
Fixed random occasional black screen of death on startup
Mega CD saves now working
Automatic screen adjustment to remove coloured bar in SMS games
Fixed screenshot corruption in save/load menu
(and probably a few other fixes I've forgotten about
The main addition is the various speed hacks available from the graphics menu. These are only used on Mega CD games and Virtua Racing which really need some speed improvements. The "performance" setting is particularly aggressive but is quite useful for some demanding titles (Pier Solar, Virtua Racing, etc).
Please let me know if there are any further improvement requests (or bugs) here or by PM.
Thanks to care16la20 for very kindly offering to test the many, many test releases