Any 6502 emulator library in C

[ilmenit]

Hi,

 

Is there any 6502 emulation library written in C with available sources that allows execution of single instruction?

There is lib6502 but this is terrible to modify (macros everywhere) and does not allow step execution.

I don't care about speed but the clear code.

[danwinslow]

I don't know of any library, but here's a suggestion if youc an't find one.

 

One trick I learned to get around zillions of obscure macros was to intercept the output of the parsing before it is sent to the compilation backend. Most compilers have a switch that allows this. You wind up with the source code after .h file processing, macro expansion and subsitutuion is done. Still not perfect, but can be a lot more readable.

[Rybags]

Write you own?

 

6502 is amazingly simple, doing an emulator would probably be something you'd knock over in a few hours.

[ilmenit]

Write you own?

6502 is amazingly simple, doing an emulator would probably be something you'd knock over in a few hours.

 

I respect my time and reinventing the wheel is nothing I want. A few hours? With debugging and making sure that emulation is 100% correct? I'd say a few days.

[Bryan]

What about the Altirra source? I doubt there's much better 6502 code out there.

 

http://www.virtualdub.org/altirra.html

[Irgendwer]

Is there any 6502 emulation library written in C with available sources that allows execution of single instruction?

 

What about this one: http://raster.infos.cz/atari/sa_libraries/sa_libraries.htm

AFAIK it is based on the Atari800 code.

 

Edit:

Since the "readme" seems missing there, here the contents:

 

========================================================================

DYNAMIC LINK LIBRARY: sa_6502.dll license: GPL

Standalone CPU 6502 emulation library, by C.P.U. 2003

========================================================================

 

This is the library created from the CPU 6502 emulator. Code was taken

from Atari800 emulator 1.2.4 (http://atari800.sourceforge.net) and was

stripped down for instructions execution only and lacks a lot of the

original functionality (IRQ, NMI, etc.).

 

It provides this functions:

 

void C6502_Initialise(BYTE* memory );

int C6502_JSR(WORD* adr, BYTE* areg, BYTE* xreg, BYTE* yreg, int* maxcycles);

void C6502_About(char** name, char** author, char** description );

 

Note:

 

Full source codes are in the "src" directory.

Edited March 19, 2014 by Irgendwer

[ilmenit]

Seems to be exactly what I need and exactly at the moment when I need it!