Ms. Pacman Twin

[arcadez2003]

• Added support for rare, Ms. Pacman Twin (mspactwin) simultaneous 2 player play [arcadez, grant2258, mahoneyt944]

[arcadez2003]

@amadvance i was clearing out some dev code i had kicking around and stumbled upon a part converted driver i
must have been working on some time back which adds support for Ms. Pacman Twin a recently dumped hack
which turns the game into a simultaneous two player version.

So i finished off the driver and here it is updated for this core im not 100% sure this will work i have some concerns
around the memory mapping but rather than rabbiting on about it now try the game and lemmie know if it works
and if not we can cross that bridge when it comes.

This is a good wee version of a classic game as two players can be used at the same time it was high on the
most wanted list for years before a dump finally turned up so it's well worth adding here.

Regards.

EDIT dont worry about the build failure it's related as usual to me pushing each file one at a time
any errors around mspactwin_videoram_w will be sorted when all files are merged.

[amadvance]

Hi @arcadez2003
It looks like that we miss the definition of memory_set_opcode_base() in MACHINE_RESET( mspactwin ). At present, it doesn't build, even adding all the following pull requests.
Can you please check?

[arcadez2003]

@amadvance damn i forgot that MAME totally changed the CPU decryption handling in the 101.u3 release, so long
story short the decryption code will need to be updated to work within your MAME106 codebase and it's not my
area of expertise unfortunately.

But i've asked @grant2258 who originally reworked the Ms Pacman Twin decryption for use in MAME78/84 if he
could help us with this so hang tight for now.

[grant2258]

Been away for a bit will have a look when I get the chance sorry about the delay just got home.

[amadvance]

Thanks @grant2258, and don't worry. Take your time.