version 1.05 beta -- Beta release of 1.05
A mostly Mac/65 compatible cross-assembler

ATasm is a 6502 command-line cross-assembler that is compatible with the original Mac/65 macroassembler released by OSS software. Code development can now be performed using "modern" editors and compiles with lightning speed.

ATasm is hosted at SourceForge.net.

This version of ATasm introduces serveral new features, but has a few known bugs with macro expansion (macros calling macros that forward referece macro-labels). However, it is taking more time to fix this than I had anticipated. This was intended for a Halloween release, but rapidly turning into an (American) Thanksgiving release. As such I am releasing a 1.05 beta release so that ATasm can get into the hands of those who need access to the new features. The beta release is at least as stable as the 1.04 and is the preferred binary release.

ATasm Features:

• ATasm produces Atari native binary load object files or can optionally target the machine state files produced by the Atari800Win emulator (version 2.5c or greater), the Atari800Win Plus emulator, the Atari800 emulator (version 0.9.8g or greater) and the Atari++ emulator.
• Support for saving binary to .XFD or .ATR disk images
• Conditional code generation, and code block repetition
• Bank support for creating large (>64k) cartridge images or overlay code.
• Rich macro support, compatible with existing Mac/65 code libraries
• Atari specific assembler directives (.SBYTE,.FLOAT,etc.)
• Support for Atari "Sally" 6502 undocumented instructions

New in 1.05

• Support for .ATR disk images, as well as double density and enhanced density Atari DOS 2.x images
• Support for Atari++ state files, as well as updating other state files to more modern formats
• Support for the .SET 6 MAC/65 directive, allowing for compiling to offset locations
• New .BANK directive for creating large cartridge images, or for code that uses the INITAD load vector (see the documentation for examples)

ATasm runs native on IBM PCs and compiles cleanly under LINUX or any platform with the GNU C compiler.

Download the complete package from SourceForge. (includes Win9x/ME/XP/NT/2K/3.1/DOS binary, complete source code, documentation and sample Mac/65 source files)

Or, you can view the manual here(now in PDF, large chunks rewritten for 1.05) and the changelog.

If you intend to compile the package yourself, and you do not have the zlib compression library installed on your machine, download it from the zlib homepage.

Questions or comments? Feel free to contact me, or visit the SourceForge project.