Looking at the pinout difference of the MVS versus JAMMA, the only issue with directly connecting a MVS to a JAMMA cab is shorting the left speaker to ground and the test switch to ground, correct? Or am I missing any subtleties?
http://hardmvs.com/manuals/Jamma2NeoGeo4SlotPinout.pdf
http://hardmvs.com/manuals/Jamma2NeoGeo4SlotPinout.pdf