UPDATE: He has released v0.62b+. He says about it:

"Reduced the size of the default RAM available to games, in order to have smaller save states. Currently they are around 400 KB as opposed to the 4MB ones needed in my previous releases.

I also modified a bit the Key profile menu. It is now more user friendly (colors, mesages, etc) and asks before overwriting existing profiles."

Snatcher has updated his fMSX (by Osakana) fix to version 0.62a. This is what he had to say about it:

?This release includes all the fixes from the fMSX v0.61+ release (by unknown author), plus another minor update by myself, but one that might be useful for a lot of people. I added the possibility to save different key profiles. Since several MSX games make extensive use of the keyboard, and since you might have different key layouts for each of them, now you can save and load them from the KEY CONFIG menu. The option to do this is at the bottom of the menu.

You have three "slots" to save them. I guessed those would be enough. If you guys want more, they can be easily added. Just to make things clear, the configuration and requirements are the same as for version 0.61.?

You can get it in our PSP Download section [here].
You can discuss it in our forums [here].
Thanks for the email and the great work Snatcher =)

Now that you firmware 1.5 users can use homebrew, we thought this list could help you get started growing your homebrew collection! We have the most complete and up to date PSP homebrew files section on the net. Here is a list of the latest versions (as of 6/15/2005) homebrew Emulators, Games, and Applications available for the PSP. But be sure to check back often, because homebrew is updated and improved daily; new releases are streaming in all the time! Also, this is a fraction of the total files we have to offer, so be sure to check files.psphacker.com for more! A BIG thanks to all the devs and authors of all these files, we all owe you a huge thanks!!!

NOTE: Many of these emulators have the option of running the PSP at 333mhz instead of 222mhz. The authors of these emulators strongly caution you that this could be harmful to your PSP. So far we have heared many people running them for hours and not heard of anyone's PSP breaking, but we must warn you.

Emulators

GameBoy / GameBoy Color
RIN v1.24 by Mr. Mirakichi (file fixed @ 10am PST)

M.A.M.E.
MAME v0.71 for PSP r0.2 by TMK
xMAME for PSP v1.2 by unknown

MSX
FMSX v0.6 by Kamisama
HITBIT v0.05 by Mariko

Neo Geo
NGPSP v1.2.1 by NeXis2600
Neo Geo CD v0.01b by Matinez Fabrice and Fosters

NES
NesterJ v1.02 by Ruka (updated 6/15 @ 9am PST)

PC Engine (Turbo Grafx 16)
PCEP v0.6 by Kamisama (updated 6/15 @ 9am PST)
xPCE4PSP v0.002 by "E"

Sega Genesis/Megadrive
Generator v0.35 by Hotokesama, also Generator v0.01.1 (test version, 333mHz CPU Speed)
Megadrive v0.21 by Kamisama

Sega Master System
SMS PSP v0.4 by Yoshihiro

SNES
Snes9x 0.02y11 by "Y" (updated 6/15 @ 11am PST)
Snes9x 0.03a (official) by Bifuteki (updated 6/15 @ 11am PST)

Wonderswan
Cygn v0.00 by REi
pSwan v0.03 by kmg

Homebrew Games:

DOOM/DOOM2 v0.01 by Lantus (updated 6/15 @ 9am PST)
LuLines v1.1 by edepot (updated 6/15 @ 9am PST)

PSP Chess v0.11 by cwbowron
Beats of Rage 0.01 by unknown
Pong v.0.3.1 by Wiz
Pocothin 2 by Mario
Higher or Lower v0.1 by Guyfawkes
HTML Game by OrR
PSP GO v0.5 by Sai
Maze Game by Mario
Arkanoid r1 by Qubitz
Puyo Puyo v1.1 by Raida-San

Homebrew Applications:

Aozora v0.8 Txt Reader by Henoheno
PSP Shuffle by Harry Wynn
Dead Pixel Fixer by Nick Toohil
CN Reader v1.0 by Bed under the Moon
PSP Timer v1.0 by Raion
PDF 2 PSP by Michael W. Heinz
PSP Calendar v0.3 by Yamasan
PSP Calc v0.2 by Yamasan
(many more at files.psphacker.com)

Thanks for visiting psphacker! Updated 24/7 with up-to-the-minute news, we are proud to be the #1 PSP News site on the net. If you have any files that we are missing, please submit them to us using the "submit news" feature on our site.

An updated version of the fMSX Emulator for PSP has been released by Kamisama. It appears it now also has a virtual keyboard like the HITBIT MSX emulator (check keyboard.bmp in the zip file). You need the MSX BIOS for this to work, you can get it from other MSX emulators online.

You can get it in our PSP download section here.

Mariko has released a new version of the MSX emulator for PSP. Zerox reports that this version runs faster, and that a keyboard feature has been added.

You can get it in our PSP download section here.

A new version of the MSX Emulator has been released. This one does come with an Eboot, but I don?t have many of the MSX ROMs (even though 1942 is a choice game), so I haven?t had a chance to play with it much yet. I have been unable to find an english translation of the authors name, so if you?re interested in this emu, please post your findings about it, and the author, below.

You can get it in our PSP download section here.

(P.S: can someone make some MSX icons? I have this strange fascination with posting them? ya I know, too much coffee today.)

The HITBIT Emulator for PSP has been updated by Seiko. While it does not appear to play games on hardware yet (or at least I couldn?t get it to), heres a rough english translation of the readme:

In order the HITBIT emulator Ver0.03 [ in beginning ] to move on the basis of the source of the fcMsx v3.0 with the PSP, it is in trial and error. In combination with the mk.bat to your own environment, after modifying, please execute. Compiling in the /PSP/GAME/MSX folder of the memory stick, please insert the EBOOT.PBP and the other ROM images which it is possible. [ Reference of ROM image ] CMOS.ROM
MSX.ROM
MSX2.ROM
MSX2P.ROM
MSX2EXT.ROM
DISK.ROM
FMPAC.ROM
KANJI.ROM
MSX2PEXT.ROM
MSXDOS2.ROM
PAINTER.ROM
slot A CARTA.ROM
slot B CARTB.ROM

You can get it in our PSP download section here.

(Updated) Version 0.02 of the MSX emulator, HITBIT for PSP, has just been released. This version also doesn't appear to run any games yet. This is a screenshot from one of the old MSX machines.

You can get this file from our PSP download section here.

Mariko has released his HITBIT Emulator based on the fMSX v3.0 source.

HITBIT was a MSX/MSX2/MSX2+ computer released by Sony. I don?t think this emulator is just limited to that particular brand though as it does use the ROMs for all the different types of MSX computers.

This version is not very usable yet since its in the development stages but its a start.

You can download the program, source code, and the necessary ROMS to run it from our PSP downloads section here.

MSX.ROM - Standard MSX BIOS and BASIC code
MSX2.ROM - MSX2 BIOS and BASIC code
MSX2EXT.ROM - MSX2 ExtROM containing system extensions
MSX2P.ROM - MSX2+ BIOS and BASIC code
MSX2PEXT.ROM - MSX2+ ExtROM containing system extensions
DISK.ROM - MSX DiskROM containing BDOS and Disk BASIC
FMPAC.ROM - FM-PAC BIOS and BASIC extensions
MSXDOS2.ROM - MSXDOS2 system core
PAINTER.ROM - Yamaha Painter, graphical editor found in Russian MSX machines from Yamaha
KANJI.ROM - ROM with Kanji character images
CMOS.ROM - Non-volatile memory used in MSX2 and MSX2+.