.386 .model flat, stdcall option casemap :none include \masm32\include\windows.inc include \masm32\include\kernel32.inc include \masm32\include\masm32.inc includelib \masm32\lib\kernel32.lib includelib \masm32\lib\masm32.lib .data UserInput db 255 DUP(0) .code start: invoke StdIn, addr UserInput, 254 invoke StdOut, addr UserInput invoke ExitProcess, 0 end start