Edit I have released a new version that address some graphical issues on the HUD and fixes the fact that it is impossible to exit the game. The reason it is fixed is because instead of using a fixed Save/load vram address which may only be correct on a certian firmware version it instead searches for it.
I have ported open Jazz jackrabbit to the casio prizm. Here are the controls
keys[C_UP].key = KEY_PRGM_UP;
keys[C_DOWN].key = KEY_PRGM_DOWN;
keys[C_LEFT].key = KEY_PRGM_LEFT;
keys[C_RIGHT].key = KEY_PRGM_RIGHT;
keys[C_JUMP].key = KEY_PRGM_ALPHA;
keys[C_SWIM].key = keys[C_JUMP].key;
keys[C_FIRE].key = KEY_PRGM_SHIFT;
keys[C_CHANGE].key = KEY_PRGM_OPTN;//change weapon
keys[C_ENTER].key = KEY_PRGM_RETURN;
keys[C_ESCAPE].key = KEY_PRGM_EXIT;
keys[C_STATS].key = KEY_PRGM_F1;
keys[C_PAUSE].key = KEY_PRGM_F2;
keys[C_YES].key = KEY_PRGM_F3;
keys[C_NO].key = KEY_PRGM_F4;
Here is the source code https://github.com/ComputerNerd/Open-Jazz-Jackrabbit-Casio-Prizm-port
And here is the binary.
http://www.casiopeia.net/forum/downloads.php?view=detail&df_id=145
To use the program place openjazz.g3a in the root directory then create a folder called jazz place openjazz.000 in that folder then download one of the many versions of jazz jackrabbit and place the resource files in that folder. You do not need the sound files and you do not need the "extra" files for example the cd version includes a demo of another game you don't need that you also don't need the *.exe file also there are some unneeded cutscene files that take up lots of memory those are not needed when in doubt use grep on the source code to see if the file is needed.
Edit Screenshots:

Heya, this seems interesting. I am curious about how this looks like. I might try to load it on my calc when I have a chance, although some screenshots would definitively be nice (or pictures if it doesn't run in the emulator)

OK I just tried this and this is pure win!

I know it's mainly like Doom where a WAD needs to be used or something like that and there are glitches so far (such as the option menu crashing the calc and glitchy number fonts in the HUD) but otherwise it's nice to be able to play games this complex and elaborate on this calc.

EDIT: Here's a video of the game in action:

BLOCKS.012
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BONUS.000
BONUS.0SC
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BONUSY.000
BOSS.PSM
CHEAT.0SC
CONFIG.000
CONTINUE.0SC
DPMI.000
END.0SC
ENDE1.0SC
ENDE2.0SC
ENDE3.0SC
ENDE4.0SC
ENDE5.0SC
ENDE6.0SC
ENDING.000
ENDLEVEL.0SC
FILE_ID.DIZ
FONT2.0FN
FONTBIG.0FN
FONTINY.0FN
FONTMN1.0FN
FONTMN2.0FN
FONTS.000
HELPME.DOC
INSTRUCT.0SC
LEVEL0.000
LEVEL0.001
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LICENSE.DOC
MACRO.1
MACRO.2
MACRO.3
MACRO.4
MAINCHAR.000
MANUAL.DOC
MDRV000D.MUS
MDRV002D.MUS
MDRV003D.MUS
MDRV004D.MUS
MDRV005D.MUS
MDRVINFO.INT
MENU.000
MENUSNG.PSM
openjazz.000
ORDER.0SC
ORDER.DOC
ORDER_DE.DOC
ORDER_UK.DOC
PANEL.000
PLANET.000
PLANET.001
PLANET.002
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PLANET.023
RTM.000
SETUP.EXE
SETUP.INT
SPRITES.000
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STARTUP.0SC
SYSOP.DOC
VENDOR.DOC
BLOCKS.000
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BLOCKS.007
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BLOCKS.010
BLOCKS.011

I forgot to remove one or more exe file and I don't know if the .doc files are necessary, though. Even then, you might still run into issues like messed up fonts or black text on black background as seen in the video. However, the game still seemed fully playable. It's easier than it looks like in the video, because I was playing one-handed while holding the cam.

That looks quite crazy, yet nice! I have to try it as soon as I can!

Never played this before, but it looks fantastic on the Prizm. Nice job on the port so far!

Where are there mode 7 graphics? Do you mean certain versions of the game?

EDIT Nvm, the author edited his first post with screenshots. I couldn't find any of the mode 7 thing in Youtube vids, though, but I was watching speedruns. I guess it's a bonus stage, right?

DJ: do you have a download link to where you got those files?

I am unsure if I am allowed by Omni rules to post a link, since it would fall under the same category as warez/ROM/other copyrighted material. A simple Google search should give good results, but be sure to pick up the first game, not the sequel.

ok