You can make an arduino version it is open source feel free to do whatever you want with it as long as it is free.
I never finished the arduino version and dont plan too.(this is an enhanced version,the original arduino version had just 1 rgb led and 3 color dials)

I was looking for a device to make an emulator for.(preferably with the cpu already emulated(typing opcode after opcode in a switch statement does not sound very fun.))
I chose the casio prizm but cant find a self contained sh4 emulator.(All the files for the sh4 are in there own directory and not directly wired into the device emulator)
So the only functions it would have are setmem32,16,8bit()/readmem32,16,8bit()/reset()/cycle(int xmanycycles).
Differing functions are fine as long as they are not hardwired to the device emulator.(like if cycle() was done in milliseconds instead of processor cycles)

I do know how a dynarec works but unless absolutely necessary i would like to avoid it because the goal with all my projects is >80% cross-compatibility.(The prizm is only 50mhz and has no gpu or audio and i would be willing to emulate an underclocked prizm (30mhz?),and put video and i/o on a second thread.)

The platforms i am targeting are

Android(arm,x86)
Mac
Windows
Ubuntu
Ios(Jailbroken)
Anything else qt creator can compile for.
(Js too if it is fast enough(will need modification for emscripten because i am using qt creator because of cross-compatibility and HATE makefiles))

The prizm seems like a challenge but if people will help i am willing to do it.
The sh-4 cpu i think is supported by mame.

Ok but i really need to make an emulator so are there any other devices with reasonable functionality(can be programmed,can play games) that are not too complicated and havent been emulated yet.(ps2/3,3ds)

This is something i am doing while i wait for a response about nspire_emu for arm android and the ti 84 + ce rom to be dumped.
This is basically jsTIfied for the 68k ti calcs (I am only writing support for v200 while i wait) but it will be open source and i will separate every thing into modules(Memory,Lcd,Cpu(I know the cpu is the same in all of them),File installer) so the other calcs can be added easily.

I know nothing about this calculator except it uses the 68k which i am familiar with.

If you know any of the information needed below please reply.

ToDo:
CPU:Scripted amiga emulator already has a cpu core for the 68k./strip out amiga related functions
Display:Need to know the layout and starting address of the framebuffer.(Also dont know the greyscale level(1bbp,2bbp,4bbp))
Keypad:Need to know starting address and layout of the keypad buffer.(or what ever it uses(ms dos just sets one value to the keycode and calls an interrupt))
Sound:Anything about 3rd-party sound mods i need to implement.

Already finished.(It took 2 days i have had the idea a long time it was designed for
an Arduino led board(with even less leds/pixels) but this contest gives about the same i/o capacity as an Arduino so it fit perfectly)

Unexploded ordinance the game where you must disarm bombs.
https://drive.google.com/file/d/0B5HuG10h5HbnV2hqTlBWS19CNGs/view?usp=sharing
Sorry attempting to embed the above link gave file not found so just copy above.

The first 3 are the rgb values of the color the fourth is the color.
You control the bottom color and must match it to the top color.
Though all colors are not available at all times and time is ticking.

More surprises to come when the game is released.