[EM] NES, DSV, & SMA = ?

[James Green-Armytage]

Hi Mike,

	I've just now finished going over your reply about anti-reversal
enhancements. I've made a couple of notes for a reply, but first things
first:
	You mentioned a few methods which I haven't heard of: NES, DSV, and SMA.
Would you mind telling me how those work? They sound interesting. I'm
assuming that they don't stand for Nintendo Entertainment System or Deep
Sea Voyager.


James