Tass64

Jul 20, 2023

Multi pass optimizing macro assembler for 65xx series processors

64tass is the multi pass optimizing macro assembler for the 65xx series of processors.

Key features

  • Open source portable C with minimal dependencies
  • Familiar syntax to Omicron TASS and TASM
  • Supports 6502, 65C02, R65C02, W65C02, 65CE02, 65816, DTV, 65EL02, 4510
  • Arbitrary-precision integers and bit strings, double precision floating point numbers
  • Character and byte strings, array arithmetic
  • Handles UTF-8, UTF-16 and 8 bit RAW encoded source files, Unicode character strings
  • Supports Unicode identifiers with compatibility normalization and optional case insensitivity
  • Built-in linker with section support
  • Various memory models, binary targets and text output formats also Hex/S-record
  • Assembly and label listings available for debugging or exporting
  • Conditional compilation, macros, structures, unions, scopes


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