Team Xos have released an Apple2 emulator for the PSP, heres whats known about this release:
Announcing the release of Apple II Portable emulator for PSP. Apple II Portable is a homebrew application which will emulate the Apple II on your PSP.
Feature Log
imported YAE 0.6 sources
16:9, 4:3 ratio displays & overscanned displays
disk swapping
40 & 80 column text modes (slot 3 80 col card)
two DiskII drives, prodos and dos 3.3 compatible
II, II+ and IIe emulation
hard (memory clearing) reset