[org 0x7c00]
bits 16

start:

    inputLoop:
        mov ah, 00h ;keyboard input is set to register ah
        int 16h ;keyboard input is gotten
        mov ah, 0x0e ;teletype interupt is set to print out al, in other words the keyboard input
        int 0x10    ;teletype is told to output what ever is in ah to the screen
        mov di, User_Input
        cmp al, 'version'
        je printVersion

        jmp inputLoop ; allows the user to enter command


    printVersion:
        mov si, version_string ; Sets the string as a source
        call printFunction ; Calls the print function


jmp $

version_string db 'Version: prealpha 0.0.0.1', 0  ;defines a string I want to output later.
User_Input db '', 0

printFunction:   ; Credit to mikeos for this function.
    mov ah, 0Eh     ; int 10h 'print char' function

.repeat:            ; Loop
    lodsb           ; Get character from string
    cmp al, 0
    je .done        ; If char is zero, end of string
    int 10h         ; Otherwise, print it
    jmp .repeat

.done:
    ret



;
;   Magic boot number
;
times 510 - ($-$$) db 0
dw 0xAA55