Mappy fans of the world our hopping friend comes
to life !!
After a few request for help
getting Hopping Mappy running on the Rolling Thunder Namco 'system
86' game board, and seeing as I'd done the same for Skykid DX
I took a look at the hardware & software to see what could be
done. Here are the results.. Hopping Mappy on a Rolling Thunder
Hardware & Software
Hardware used for Hopping Mappy is virtually identical to Rolling Thunder
PCB.A change of one of the address decoding custom chips stops
the upgrade being a straight ROM swap. The Hardware differences
are pretty minor, and the same type of patches used with SkyKid DX
were all that was needed.
Some control addresses are modified
to new locations. The Interrupt enable/watchdog timer reset are
modified on the sound CPU, and the watchdog reset is modified on the sub
CPU. Two simple program hacks and the game
will happily run on a unmodified Rolling thunder.
The following is a walk through of doing
the upgrade, the only problems I can see if getting the color PROM's
The mods process is very, very similar to Skykid DX.
Before you Start
This conversion hack requires a certain level
of technical ability so DO NOT attempt this without the
correct tools and some experience in board level repair work.