Zupapa ! Custom decrypted version.

[pierpa86]

Hello Guys,
One friend of mine recently bought a copy of Zupapa and opening the case we find out that is an old conversion but something is wrong.
Checking the chip it's obviusly a 29C800 - 1MB so here we have a total of 4MB C sprite....
Since this game decrypted is 8MB C1 and another 8MB C2.... what they have done here ?
Checking around all the version of the rom on the net, I found this strange version.

Zupapa! (custom decrypted C) - zupapad.zip
Its fit, but what they cut out ?

There is a big difference on the numbers of sprite inside... 100.000 is missing from the normal decrypted version.
How the game still work ? Some one know the story behind here ?

 

[iq_132]

It appears that the last 12mb are not used. It runs well on NeoGeo CD with only the first 4mb other than the broken sound. I believe this is related to the CMC sprite encryption that these games use requiring 16mb of data minimum.
Pochi and Nyaa is another example of this FYI. Only the first 4mb of sprite data is required.