Thomas- Take a look at some work I did a while back on the BIOS; it should be a good starting point: = http://members.cox.net/seanandalicia/chanf.asm. Sean -----Original Message----- From: channelf-bounce@xxxxxxxxxxxxx = [mailto:channelf-bounce@xxxxxxxxxxxxx] On Behalf Of Thomas Mathys Sent: Tuesday, November 02, 2004 11:39 AM To: channelf@xxxxxxxxxxxxx Subject: [channelf] Re: DASM header files update i find it ok as is - uppercase constants for bios calls etc, and=20 alternative labels for backward compatibility with existing code. i startet disassembling/commenting the bios, maybe i can identify = further=20 useful routines. i started out with the routines identified by sean, but = i'll try to provide as much information as i can, especially about=20 used/destroyed registers. regards thomas >Thanks to Kevin for the work. I have updated the standard header = files, >release at http://www.atari2600.org/dasm Please note that I've = implemented >my idea of the standards. You can argue for other methods -- but be >convincing! Note the deprecated equates. >Cheers >A