Japanese homebrew developer NJ has released new development versions of his CPS1, CPS2, Neo Geo CD, and Neo Geo MVS emulators for the PSP. According to the translated readme, changes have been made to both video and sound emulation.

Additionally, NJ has updated the stable 2.2.x branch of his emulators to 2.2.5, which include various bug fixes. Downloads for each of the respective builds can be found after the jump.

Download:
CPS2PSP 2.31 for PSP Slim
MVSPSP 2.31 for PSP Slim

CPS1PSP 2.31 for Firmware 3.X
CPS2PSP 2.31 for Firmware 3.X
MVSPSP 2.31 for Firmware 3.X
NCDZPSP 2.31 for Firmware 3.X

CPS1PSP 2.31 for Firmware 1.5
CPS2PSP 2.31 for Firmware 1.5
MVSPSP 2.31 for Firmware 1.5
NCDZPSP 2.31 for Firmware 1.5

CPS1PSP 2.2.5 for PSP Slim
CPS1PSP 2.2.5 for Firmware 1.5
CPS2PSP 2.2.5 for PSP Slim
CPS2PSP 2.2.5 for Firmware 1.5
MVSPSP 2.2.5 for PSP Slim
MVSPSP 2.2.5 for Firmware 1.5
NCDZPSP 2.2.5 for PSP Slim
NCDZPSP 2.2.5 for Firmware 1.5

CPS1PSP/CPS2PSP/MVSPSP/NCDZPSP [NJ]

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Read more: NJ Updates CPS & Neo Geo Emulators To 2.2.2,  NJ’s PSP Arcade Emulators Updated With Ad-hoc Support,  MVSPSP 2.2.3,  NCDZPSP 2.2.3,  NJ Updates CPS1PSP, NCDZPSP For PSP Slim