1.6 KiB

Raw Permalink Blame History

About

Attempts to translate x86 assembly into mos6502 assembly.

Why?

Why not? I figured I just barely knew some x86 and some 6502, so why not learn some more about both. Besides, this project can actually have some interesting applications.

Example

After compilation (requires a full C++14 compiler), you can run something like this:

// test.asm
main:
	movb	$1, 53280
	xorl	%eax, %eax
	ret

cat test.asm | x86-to-6502

And get this output:

main:
	ldy #$1
	sty 53280
	lda $00
	rts

Caveats

Nothing is guaranteed. This could break your computer. Who knows?
All values are truncated to 8 bit. We have no support for 16bit math or pointers yet
Only as many instructions are supported as I have needed to support to get my test cases working

To Do

Everything

Well, lots of things.

Better code organization

I really had no idea what I was doing when I started this. So, like all code, it's going to need some improvements along the way to make it more organized and more maintainable.

Improvements

Keep track of input source lines and add comments in output to show where lines came from, for learning / debugging purposes
Better / more efficient translation
Support for 16bit math? Maybe? We need to at least be able to do 16bit pointer math
Consider supporting the "Sweet 16" virtual 16bit CPU that Woz designed?
Maybe for 16bit operation we try to detect if the input code is working on 8bit registers or 16+bit registers and do the right thing?
Support for more CPU instructions
A test suite

1.6 KiB Raw Permalink Blame History