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!!!Assembler
Given the extremely slow performance of [Atari Basic], the go-to language for programmers writing games or other speed-critical programs was assembler. Shepardson Microsystems used a cross-compiler to write BASIC, but at the same time began development of their own assembler which was later released as the [Atari Assembler Editor] in ROM cartridge format. Assembler/Editor lacked many features, and was only suitable for small programs, so Atari also released the disk-based high-end [Atari Macro Assembler|Atari Macro Assembler and Program-Text Editor CX8121]. Macro Assembler was glacially slow, and there was a thriving market for 3rd party assemblers and debuggers to fix the problems seen in one or the other.

!!Overview
* [6502 OpCodes.xlsx] ; Excel table with all opcodes and comparision between different Assemblers

!!Assembler for Atari Computers
* [Atari Assembler Editor]
* [Atari Macro Assembler and Program-Text Editor CX8121]
* [AMOEBA]
* [EASMD]
* [MAC/65|Mac65]
* [BUG/65|Bug65]
* [Dunion's Debugging Tool (DDT)|DDT]
* [Extended Dunion's Debugging Tool (ExDDT)|Extended_DDT]
* [Synapse Assembler]
* [Atmas I]
* [Atmas II]
* [Edit 6502]
* [Bibo Assembler]
* [130XE+ Makroassembler V2.1 mit MyDOS 4.50 (1991)]
* [A65 Assembler]
* [MAE Assembler]
* [Alfasm]

!!Cross-Assembler
* [ATASM|http://atari.miribilist.com/atasm/] ; Mac/65 compatible cross assembler
* [MADS|http://mads.atari8.info/] ; powerful and modern cross assembler under constant development
* [XASM|https://https://github.com/pfusik/xasm/] ; xasm is a 6502 cross-assembler with some syntax extensions. By default it generates binaries for Atari 8-bit computers.
* [APX-20051 Cosmatic Atari Development Package] ; cross-assembler for 1802 assembly language

!!Development IDE
* [WUDSN IDE|http://www.wudsn.com/index.php/ide] ; smartest development environment available

!!Books
* [The Atari Assembler|http://www.atarimania.com/documents/The-Atari-Assembler.pdf] ; detailed and easy-to-read introduction to programming 6502-assembly on the Atari using Assembler/Editor.
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