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Changelog for retrodisasm

All notable changes to this project will be documented in this file.

[v0.3.1] - 2026-01-03

Added:

  • add -base flag for custom base address in binary mode
  • add -o - flag for stdout output
  • add -output-unofficial flag to output unofficial opcodes as mnemonics
  • add -stop-at-unofficial flag to stop tracing at unofficial opcodes
  • add multi-bank ROM support with per-bank vectors

Fixed:

  • fix binary mode incorrectly including NES segments
  • fix tracing continuing after BRK instruction
  • fix unconditional branch detection for complementary branch patterns

[v0.3.0] - 2025-11-08

Added:

  • add CHIP-8 architecture support with retroasm assembler
  • add system auto-detection from file extensions (.nes, .ch8, .rom)
  • add -s flag for manual system specification (nes, chip8)
  • add NES ROM information in output file header comments

Changed:

  • rename project from nesgodisasm to retrodisasm to reflect multi-system support

Fixed:

  • fix instruction overlap detection for unofficial instructions
  • fix jump engine detection and processing
  • fix mapper validation for empty banks
  • fix assembler binary detection
  • fix CLI flag registration timing issues

[v0.2.3] - 2024-11-05

Added:

  • add -binary option to read raw binary files without header
  • add asm6 multi bank support
  • add option to write generated ca65 config to file

Changed:

  • improve vectors start address calculation
  • use ca65 as default assembler

Fixed:

  • fix nmi handler crash
  • fix scanning of last zero byte for prg segment

[v0.2.2] - 2024-01-06

Added:

  • add nesasm output compatibility support
  • show warning of mapper is not nrom
  • start of banking support
  • support asm6f as a assembler parameter alias for asm6
  • output data lines with address in comments

Fixed:

  • fix assembler binary name for verification on windows
  • fix crash when disassembling invalid irq handler addresses
  • improve code base address handling for large PRG
  • improve instruction parameter converter prefix and suffix handling

[v0.2.1] - 2023-07-19

Added:

  • added asm6 output compatibility support

Fixed:

  • fix crashes when disassembling nesfab generated roms

[v0.2.0] - 2023-01-05

Added:

  • jump engine detection
  • write CRC32 checksums of segments in the output header as comments
  • batch processing of multiple input files
  • new logger output with different verbosity levels

Changed:

  • the project was moved into its own git repository

Fixed:

  • data references into unofficial instruction opcodes
  • data references before code base start
  • instruction overlap with IRQ handler start address
  • support different code base addresses
  • variable detection for zero page access
  • variable usage detection for indirect jumps

[v0.1.1] - 2022-08-02

Added:

  • add var aliases for zeropage accesses
  • support code/data logs
  • support more mappers
  • unofficial instruction opcodes are bundled

Fixed:

  • fix wrong address in comments for non standard rom base addresses
  • support data references into instruction opcodes

[v0.1.0] - 2022-06-26

First version of retrodisasm (formerly nesgodisasm) released.