Tim, your posts look suspiciously like you're trying to pass off work to other people that is high on your priority list.
When you say "it needs ROM dumps", this is nothing more than a statement. If you want progress on the systems you're championing, go hunt for those dumps. Talk to collectors, cash in favours, buy stuff on ebay and the equipment to save the firmware from the chips. Then offer it for inclusion into MAME. Even the physical dumps in your hands are no guarantee though, that the inclusion is going to happen over night - not every developer is familiar with your pet project, and they work on MAME in their own spare time and on their own schedule.
MAME ist a hobbyist project, a grand one, but still.
When you say "I still need a copy of NX1000 ..." again, that's your responsibility, unless you mean "I'd love to have those dumps for completion's sake in my collection" - but that doesn't have anything to do with MAME.