OK, thanks for the advice. Tables of addresses for JMP (abs) is not really what I would consider 'address arithmetic'. In a 'clean' program the table would be initialized with a list of labels in the code segment, and it would work even if the instruction translations would have different length as ...

That was what I was afraid of. So I'll probably write my own.

I already looked into the problem, and it does not seem that hard. I don't think it would even have the complexity requiring usual compiler syntax trees and code generation from them. 6502 assembler and x86 assembler is nearly a 1:1 ...

I am thinking ahead a little bit. Once I succeed in running my old (assembler-written) Chess program on the PC as a subroutine in a C program, really calling the 6502 emulator as a subroutine, I would be ready to make the next step.

The emulation will of course involve a large speed penalty, and ...

Well, so far I succeeded in bringing my old Chess program in machine-readable form (by scanning the machine code from a book with OCR), and it seems to run on an emulator I downloaded (after adapting the I/O to suite the needs of this particular emulator).

So I am in business...

OK, thanks. I downloaded the archive. I will let you know about any progress/problems.

Yes, it sounds interesting!

If I have the C source code of the core of a 6502 emulator, i.e. the part that advances the state of a byte array that represents the memory content of the emulated 6502, I could simply compile it with the rest of my program, and call it from there.

Like you remark: the ...

Hi, I am new here!

Does there exist a convenient way to use routines written in 6502 assembly in modern C programs for running on a PC?

I was tinking about some general 6502 interpreter routine, available in C source, to which I could pass an array with 6502 code, which would then run that code ...