Fixed a SCU DSP bogus bug with flags, fixed SMPC intback command, moved it inside a command and hooked up the SMPC direct mode inputs. This allows the following Sega Saturn goodness:

The diagnostic cart is now operational too, and it really shows how bad is our current Saturn emulation (and some very lovely Engrish as well 😉 )

Starting from u4 cycle, I’m been busy into finally cleaning up the Sega Saturn / ST-V driver. After that, I’ve started to nail down the irq system/pixel clock again (that was pretty messy before), and got various things fixed (namely the Pebble Beach / Funky Head Boxers hang).
All of this also caused Virtual Mahjong to finally show itself with correct gfxs during gameplay.