[Help] PSP or DS - but in other way

1. Most of them with varying degrees (but usually decent0 quality). Note that the PSP 2000 has better specs than the PSP 1000
2. ^_^ has a guide as one of his links for converting a PSX game to a PSPSX game. That doesn't help though with setting up your PSP (you can do this now without a P-Battery?)
3. as stated, PSP 3000 can't at the moment.
4. I know PSP 2000does (as that's what they told me when I bought it), but from what I gather, a PSP 3000 will too.
5. Can run GBA, NES, SNES, MSX, Genesis (I think), and a slew of other systems. Unclear on DOS ports although I know they have been able to get some old games on the PSP
6. Currently an NDS can play NES, SNES (albeit slowly), and a few other systems. However, it's just not capable of playing other systems well.

Jam it back in, in the dark.