All 1 slot boards are fully Jamma. 2,4, & 6 slots are MVS (but also work on Jamma.)
The differences are subtle. Check HardMVS to see the differences in the wiring.
If your cab is wired for mono then I would go for a mono 1 slot, If you put a stereo mvs in there the sound will be all screwed up unless you fit a switch. Its not too hard to do but you said without modding.
