This app provides a powerful x86 16-bit real mode assembly language simulator and debugger for mobile devices and Mac. It offers real-time disassembly, register monitoring, memory browsing, and BIOS/DOS interrupt support for learning and practicing low-level programming.
1.7
September 17, 2026
- Turbo mode executes a batch of instructions per frame, lifting the 1000 instructions per second ceiling so interactive programs stay responsive. - New BIOS services: INT 16h keyboard reads with scan codes and INT 1Ah timer ticks, plus arrow keys and DOS extended keys in the console. - Float the registers, memory, console or log panel in a movable, resizable window; maximize it, minimize it to a bubble, and the layout is remembered. - The console is redrawn on a single canvas that fits the 80x25 grid to any screen, with pinch zoom and an on-screen D-pad in character mode. - Assembler and runtime errors can now be copied. Fixes for memory displacement, label addresses and NASM-style res* labels. - The 8086 model viewer now supports panning with two fingers, a right-drag, or an Option/Shift drag.
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Assembly Lab is a mobile and Mac application that simulates and debugs x86 16-bit real mode assembly language. It allows users to write, run, and debug assembly code with features like instruction emulation, register monitoring, and memory browsing.
Assembly Lab is available for iPhone, iPad, and Mac, offering optimized layouts and native support for each platform.
It provides a learning-friendly environment with a syntax-highlighted code editor, console output for immediate feedback, built-in example programs, and real-time disassembly to understand machine code.
Assembly Lab includes powerful debugging tools such as setting breakpoints, stepping through code, live register monitoring, a visual FLAGS indicator, a memory browser with editing, and an execution log.
Yes, Assembly Lab supports essential BIOS (INT 10h for video services) and DOS (INT 21h for system services) interrupts, enabling interaction with simulated system functionalities.
Assembly Lab is a paid application, priced at $1.99. It does not feature in-app purchases or advertisements.
The latest version, 1.4, was released on June 4, 2026, indicating active development and updates for the application.
Assembly Lab has an age rating of 4+, making it suitable for a wide range of users interested in learning assembly programming.
