dis6502: A Flow-tracing 6502 Disassembler

dis6502 is a flow-tracing disassembler for the 6502, originally written by Robert Bond and supporting Atari binary files. Robert posted dis6502 to the Usenet newsgroup net.sources on 9-Oct-1986, and to comp.sources.unix 7-Jun-1988. Udi Finkelstein ported dis6502 to the Amiga, added support for Commodore 64 object files, and posted it to comp.sources.amiga on 4-Nov-1988. These versions are in the public domain and may be downloaded here:

• net.sources
• comp.sources.unix v15i044
• comp.sources.amiga v02i053

Enhanced dis6502

This version of dis6502 has been modified in several ways:

• Can read raw binary files.
• Option to specify alternate reset and interrupt vector addresses.
• Line numbers are no longer necessary with equates in definition files.
• If a data reference is made to an address that does not have an assigned name, but address-1 does, the reference will be disassembled as name+1. This is convenient for two-byte variables, particularly in zero page.
• New definition file directives:

  .jtab2 <addr>,<addr>,<count>	table of code pointers, split into high and low byte tables
  .rtstab <addr>,<addr>,<count>	like jtab2, but each entry contains the target address minus one, for use with RTS
  <name> .equ <addr>	same as .eq

• Rather than using recursive calls to trace every instruction, there is now a trace queue
• Updated to use ANSI C function prototypes and include files
• Amiga/Manx changes have been removed

dis6502 has been tested on Fedora Core 1, but should work on other Linux, BSD, and Unix systems.

Among other things, dis6502 has been used to produce a disassembly of Apple 1 BASIC.

Download

dis6502 is distributed under the terms of the Free Software Foundation's General Public License, Version 2. If you agree to the terms of the license, you may download it.

Download dis6502-0.12.tar.gz ( 19K, Saturday, 17-Jan-2004 16:26:11 MST)

dis6502 development uses the Subversion revision control system. Instructions for access to the Subversion repository for Altogether are found at http://svn.brouhaha.com/, and there is a web interface to browse the repository at http://svn.brouhaha.com/viewcvs/dis6502/.

Last updated January 17, 2004 Copyright 2003, 2004 Eric Smith eric@brouhaha.com

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