I’m been busy with the Sega Naomi HW stuff with Haze and ElSemi. Thanks to the latter, I’ve implemented a JVS unimplemented i/o command used by the later games of this hardware.  Now Ikaruga (and others) can be coined up and are playable (although still in wire-frame)…

As a bonus track: thanks to some internet research there, I’ve fixed one of the most long standing bugs that afflicted Idol Janshi Suchie-Pai Special with the back layer pens.

Priorities still need fixing in that driver though (needs some side-by-side tests).

Last but not least: thanks to my site admins for the new blog skin. 😉

I’m currently doing some major work to the jalmah.c driver,in order to fix most of the issues in it and in search of new protection issues.Some WIP shots:

Mahjong Kakumei

Mahjong Daireikai

Mahjong Channel Zoom-In

Urashima Mahjong

Ok,here’s the story: the D2 register wasn’t consistent so I had to write a new ASM m68k function for this issue.In about two hours to write + debug boring opcodes in machine language I’ve done and in a uncalculated time (in between 1 and 5 minutes I think) I’ve hooked up a sort of DMA/protection thing on which the game accesses hoping that nobody will be so smart to notice that 😉

Now I just need to clean-up the whole driver and it’s ready for the submission.

Next to come only on this radio station: write debug code for Alien Command,to let it finally boot.

Found the problem with it,I tried every possible thing on Earth with it and finally the simplest solution pops up: it seems that the protection jump at $f03c0 a.k.a. the palette ram sub-routine is called with the wrong vector.Differences between this call and all the others is that the D2 register is not equal to zero but is equal to 0x0b00000.My 0,50 € guess is that the programmers added this extra “feature” to protect the most interesting thing of this game. 😛

Now I need to check the other two girls and if there’s consistency I have to add this to the sub-routine…

Fixed the bankswitch bug in Urashima Mahjong.It uses a ram location at $8001c and some combinations between the two bg roms.

 I hate to say but it happens that when a problem is fixed another one pops up.Needs to know why when you win the colors are screwed up like this:

Color bankswitching?