KrD

invoke  AllocConsole
    invoke  GetStdHandle, STD_INPUT_HANDLE
        push    eax ;InputHandle
        push    eax ;InputHandle
    invoke  GetStdHandle, STD_OUTPUT_HANDLE
        push    eax ; OutputHandle
    invoke  SetConsoleMode, eax, ENABLE_PROCESSED_OUTPUT ; OutputHandle
        pop eax
    invoke  WriteConsole, eax, hello, msgsz, NULL, NULL ; OutputHandle
    invoke  FlushConsoleInputBuffer ; функция сама забирает 1 аргумент, InputHandle
        pop eax
    invoke  ReadConsole, eax, buf, bufsz, cnt, NULL ; InputHandle
    invoke  FreeConsole
    invoke  ExitProcess,0

cmp ax, 'a'
setb cl
cmp ax, 'c'
seta ch
or ch, cl
jne default
call [ax + jump_table - 'a']
default:
ret
jump_table dd getHelp, openTextEditor, reboot