NewOswan (name likely to change)

What is this project?

NewOswan is a WonderSwan emulator originally based on oswan-unix and heavily modified to be more accurate and better hardware support.

I don't care about the blabla, just show me the thing running

Ok ok, here are some screenshots:

Using a Swan Crystal boot rom:

Wonderswan Crystal boot splash:

Clock Tower:

Star Hearts:

What's different from oswan-unix?

A couple of things:

NewOswan do properly support the internal EEPROM and cartridge EEPROM. The original version was based in improper and innacurate hardware documentation and was accessing and storing the information in an incorrect way.
NewOswan support the internal bootrom of all the three model of the WonderSwan.
NewOswan also provide stub version for the bootrom if you don't own the original console, you can still use the emulator withtout copyright infreigement. (no copyrighted materiel is included with the emulator for obvious reasons)
NewOswan use OpenGL instead of SDL
Sound is currently not supported
NewOswan is currently not meant as a fully operational emulator as this project mostly started as a way to test game and the original hardware. Still the idea is to make it overtime as accurate as possible
It is now pure C (the original code was based on a C project with some unneeded C++ here and there)
64-Bit clean, the original code was making assumption on some type size that can break on a 64bit system
Build and run on Mac OS X, Linux x86 and ARM, and probably more systems.
Some crude debugging tools that can only be enabled at compile time
Tons of fancy logs in the console! Like:

IEEP: RA:143F RD:0006 A:03F C:WRI - Write? Yes : 0006
IEEP: RA:1440 RD:0101 A:040 C:WRI - Write? Yes : 0101
IEEP: RA:1441 RD:0016 A:041 C:WRI - Write? Yes : 0016
IEEP: RA:1442 RD:0000 A:042 C:WRI - Write? Yes : 0000
WriteIO(6A, 00) [F000:0018h];
WriteIO(6B, 00) [F000:0018h];
Icons           H    
WriteIO(6A, 00) [F000:0018h];
WriteIO(6B, 00) [F000:0018h];

And many more thing I probably forgot about as this project was originally not version managed as it was just a crude hack on the original code and are not in the logs.

Futur plans

Complete refactor of the code.
Add a proper CPU debugger
Add other nice debugging tool like the GPU status and other things that could be needed. Acheiving the level of the tools provided by the NES emulator Mesen would be nice.
Being able to rotate the screen
Maybe being able to change the game at runtime instead of start time
Full Audio support

The boot rom stubs

You can find the source and file in the irom_stub folder. They are identical and for now provide only the logic to boot a cart. There is no bootsplash nor configuration menu. A bootsplash may be added later.

Feel free to use these stub for your own emulator if you wish, just be nice and put a line saying you are using it and a link to this project in your documentation :)

Godzil / NewOswan