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FantASM 1.7.4 is available

July 17, 2026FantASM

FantASM 1.7.4 is available to download.

What’s new

Fixed

  • --lsp no longer writes the version banner to stdout, which corrupted the JSON-RPC stream.
  • _asmpc / _codesize now resolve consistently (_asmpc = current instruction PC, _codesize = live PC).
  • Out-of-range jr/djnz now errors instead of silently truncating the offset.
  • !test init_reg/assert_reg rejects non-settable operands ((hl), af') instead of mapping them to A/HL.
  • Block-graphics glyphs (codes 128–143) are no longer falsely flagged as non-ASCII.

Changed

  • Large internal maintainability refactor (no behavioural change).
  • Test coverage expanded from ~206 to 304 tests, including a self-contained byte-encoding oracle for the base Z80 instruction set.

Get it from the Downloads page.