Full |verified| — Z80 Disassembler Online

: A modern "smart" tool that attempts to automatically identify and label strings and data areas to save manual effort. YAZD (Yet Another Z80 Disassembler)

At its heart, a Z80 disassembler performs a linear or recursive traversal of a binary file (typically a ROM, COM file, or memory dump) and converts each opcode byte—or sequence of bytes for multi-byte instructions—into its corresponding Z80 mnemonic. For example, the byte 0x3E followed by 0x41 becomes LD A, $41 (load the hexadecimal value 41 into the A register). An online disassembler must correctly handle the Z80’s variable-length instruction set (1 to 4 bytes), distinguish opcodes from data, and optionally resolve jump and call targets.

We can also discuss how to handle during reverse engineering, or look into the best modern cross-assemblers to rebuild your modified assembly code. Share public link

Click the "Disassemble" button, and the disassembler will output the corresponding Z80 assembly code: z80 disassembler online full

Set the starting address ( ORG ). If your file is meant to load at address 0x0000 , ensure this is configured first.

Do you know the exact where this code is supposed to execute in memory?

Legacy code comes in various containers. A robust online tool supports: : A modern "smart" tool that attempts to

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

Paste your hex string or upload your binary file into the browser interface.

For those tasks, combine the online disassembler with a desktop emulator. Disassemble the ROM online for annotation, then run it in an emulator with a built-in debugger. An online disassembler must correctly handle the Z80’s

function disassemble(binaryData) { const disassembly = []; let pc = 0;

What (if any) do you plan to compile the final code with? Share public link

A full online Z80 disassembler bridges the gap between hardware archaeology and modern development efficiency. By eliminating installation friction and providing instant visual feedback, these web tools empower developers to uncover the inner workings of classic software directly from their browsers. Whether you are preserving digital history, patching a childhood game, or learning low-level programming architectures, mastering online disassembly is a powerful skill to add to your technical toolkit.

When searching for a robust online solution, prioritize these capabilities: