Z80 Disassembler Online Full Updated Jun 2026

: A long-standing repository of Z80 tools that lists several web-based and lightweight disassembling utilities. Cemetech Online Z80 Disassembler

If online tools feel too limited for your project, experts often point toward these more powerful (but downloadable) solutions:

: Advanced tools can distinguish between executable code and static data tables (like graphics or text strings), preventing "garbage" disassembly. z80 disassembler online full

Extended instruction set (e.g., block transfers like LDIR , 16-bit arithmetic).

| Feature | z80dasm (OnWorks) | YAZD | ASM80.com | z80js | | :--- | :--- | :--- | :--- | :--- | | | Cloud Linux Terminal | Command-line (C#) | Web Browser (IDE) | JavaScript (Browser) | | Supported Prefixes | Full (CB, DD, ED, FD) | Full | Full (Via ZSID) | All Official | | Undocumented Opcodes | Yes | Yes (via z80ex) | Partial | No | | Code/Data Separation | Yes (Manual Block File) | Yes (Automatic Analysis) | Manual (Debugger) | No (Debugger Mode) | | Output Format | Re-assemblable Source | HTML / Text | On-screen Debugging | Object String | | Best For | Batch Processing & Scripting | Deep Reverse Engineering | Live Debugging & Tracing | Learning & Testing | : A long-standing repository of Z80 tools that

Would you like an example of disassembling a specific Z80 binary (e.g., a CP/M .COM file or a ZX Spectrum ROM section)?

It provides instant online disassembly directly in the browser. | Feature | z80dasm (OnWorks) | YAZD | ASM80

Raw dumps from physical EPROM chips. 2. Syntax Configuration

Do you have the code as a or a hexadecimal text string ?