On Tue, Jul 07, 1998 at 03:54:26PM -0700, John Saeger wrote:
> Well I wanted to play around with the 6502's so-called undocumented
> instructions on the 2600, and none of the available assemblers support them.
> I didn't modify TASM because it's guiltware, they want money. I did modify
> DASM, but a restrictive copyright prohibits my sharing my improvements. I
> wanted something that was free to modify and free to share. So I did some
> internet archaeology, and here's what I came up with. An old assembler
> (as6502) written in C by J. H. Van Ornum at AT&T Bell Labs around 1984 or
> 1985. I modified it to output a raw binary file which is suitable for Atari
> 2600 use, and I gave it the ability to assemble the undocumented
> instructions. A file called undoc.asm is included in the archive describing
> the available instructions.
I commend your efforts. Adding undocumented instructions was one of
the things I wanted to do to improve our tools, among other things.
Strange, many emulators support the undocumented instructions (I wrote
them in for a 6502 emulation core I worked on) but few assemblers seem
to...
--
Teknovore - tek@xxxxxxx
--
Archives (includes files) at http://www.biglist.com/lists/stella/archives/
Unsub & more at http://www.biglist.com/lists/stella/stella.html
