JC64dis is a high-speed, interactive disassembler designed specifically for the Commodore 64 and other MOS 6502-based systems. It streamlines the reverse-engineering process by utilizing a three-panel interface that allows for iterative code analysis and refinement. Core Workflow for Fast Disassembly
To disassemble code quickly using JC64dis, follow this iterative process:
Load Your File: Open a standard C64 file format such as .PRG, .SID, .MUS, or .CRT.
Interact via Three Panels: Use the distinct interface areas to refine your output: Memory Area (
FFFF): The left pane where you select memory locations or blocks.
Preview of Source: The central pane showing how the code will look after the current set of commands.
Final Source: The right pane containing the generated, human-readable source code.
Define Code vs. Data: Speed up the process by manually marking blocks as “code” or “data.” For example, you can select a range in the left pane and mark it all as data, then split it into fixed-sized chunks (e.g., 18-byte blocks) with automatic labels.
Leverage Automatic Features: The tool automatically generates labels and comments, which can be customized through nearly 270 user options to match your preferred style.
Relink and Jump: Click a label in the source or preview panel to automatically jump to that address in the memory panel, allowing for rapid navigation through complex jumps and branches. Key Features that Speed Up Analysis
Multi-File Support (MPG): You can combine multiple .PRG files (e.g., a game’s music loader, image viewer, and main code) and disassemble them together as one cohesive project.
Iterative Refinement: Unlike static disassemblers, any change you make (setting labels, changing address types) is instantly reflected in the preview, helping you understand the code logic as you work.
Compiler Compatibility: Once your analysis is complete, you can export the code directly into formats compatible with popular assemblers like KickAssembler, ACME, ca65, and Tass64. Pro Tips for Efficiency
Use the Wizard: Generate “block” labels within a selection using the built-in wizard to handle large data tables quickly.
Cross-Reference Tooltips: Version 3.1+ includes cross-reference tooltips and a dedicated panel, making it easy to see every location that references a specific address.
SID/MUS Decoding: The tool has specialized logic for decoding music files, including a built-in player that helps you identify memory states used during playback. AI responses may include mistakes. Learn more JC64dis by Ice Team – itch.io
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