Visual 8051 firmware disassembly with memory mapping and CFG
Parse Intel HEX or raw binary into labeled assembly, review an interactive memory map, and generate control-flow diagrams as part of a single workflowDisassembler, from SpiceLogic Inc., is a Windows utilities tool aimed at embedded engineers and students. It validates HEX checksums, annotates interrupt vectors, and lets users add labels and comments, which helps reverse engineers and firmware authors inspect compiled MCS-51 images and verify how code occupies program memory.
What the tool reconstructs from firmware images
8051 Disassembler converts Intel HEX and binary files into readable MCS-51 assembly and produces an exportable .asm listing. The app shows opcode mnemonics, cycle counts, and affected flags alongside disassembled instructions. It also marks Special Function Registers and interrupt vectors in the listing, and supports user-defined labels and comments so the output can be annotated and reassembled into a byte-identical image.
How it behaves on a desktop during use
The tool runs as a standalone Windows program and uses an interactive memory map that maps every byte to physical locations, which keeps analysis local to the machine. Memory mapping and Mermaid-based control-flow graph rendering are UI tasks rather than background services, so the app's workload is focused during a file load or graph generation. Automatic HEX validation flags checksum and record errors before disassembly proceeds.
Safety, workflow control, and required knowledge
The tool validates HEX records and checksums before parsing, which enforces read-only verification of file integrity prior to editing. Exporting an assembled .asm that reassembles into an identical image preserves binary fidelity. The interface exposes opcode references and interactive tooltips for instructions; nevertheless, practical use assumes familiarity with 8051 architecture and assembly, making it most suitable for embedded engineers, reverse engineers, and students with basic microcontroller knowledge.
A focused analysis tool for technicians who inspect 8051 firmware
The tool serves technicians and engineers who need direct visibility into compiled MCS-51 code, offering clear inspection and exportable listings while keeping operations file-local and verifiable. Expect a specialist workflow that requires assembly knowledge and does not hide low-level details; the main limitation is the learning curve for newcomers to microcontroller assembly, not the app's technical capabilities.
