int21h

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Minimal DOS program demonstrating INT 21h system calls, cross-compiled from Linux/Windows using Open Watcom and CMake

c cmake dos assembly reverse-engineering syscall 16-bit cross-compilation 32-bit watcom ghidra open-watcom int21h dos-programming

Learn x86 assembly with step-by-step examples and setup guides: DOS 8086 (MASM in DOSBox) and Linux x86-64 (NASM).

windows linux tutorial dos examples assembly x86-64 assembly-language x86 beginner dosbox nasm 16-bit masm low-level-programming systems-programming 8086 intel-syntax int21h

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