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6502/65C02/R65C02/W65C02/65CE02/65816/DTV/65EL02 Turbo Assembler.

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64tass is cross assembler targeting the 65xx series of micro processors.

64tass Web Site


  • Open source, mostly portable C with minimal dependencies
  • Familiar syntax to Omicron TASS and TASM
  • Supports 6502, 65C02, R65C02, W65C02, 65CE02, 65816, DTV, 65EL02
  • Arbitrary-precision integers and bitstrings, double precision floating point numbers
  • Character and byte strings, array arithmetic
  • Handles UTF-8, UTF-16 and 8 bit RAW encoded source files, unicode strings
  • Unicode identifiers with case folding and compatibility normalization
  • Built in "linker" with section support
  • CPU or flat address space for creating huge binaries (e.g. cartridges)
  • Conditional compilation, macros, struct/union structures, scopes

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