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xasm is a set of a few tools for developing software for Atari 8-bit computers on a PC with MS-DOS or Windows.

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Some 6502 code in Code-Genie

News:

  • 03-10-2002: released version 2.5.2 (fixes bugs introduced in 2.5.1)
  • 21-08-2002: released version 2.5.1 (a small bug fix)
  • 08-07-2002: released version 2.5
  • 27-06-2002: released version 2.4.1 (a small bug fix)
  • 22-05-2002: released version 2.4


Features of the assembler:

  • backward compatibility with Quick Assembler
  • pseudo instructions (add, sub, inw, mva etc.)
  • pseudo addressing modes (e.g. indexing with autoincrementation)
  • two instructions with same operand may be written in single line
  • full set of arithmetic and logical operators
  • 6502 opcodes may be used in expressions
  • conditional assembly
  • sine lookup-table generator
  • Atari floating-point numbers
  • Atari executable and raw output formats