[org 0x7c00]
xor ax, ax
mov es, ax
mov ds, ax

mov dl, [bootDiskNum]
mov ah, 2
mov al, 7
mov ch, 0
mov cl, 2
mov dh, 0
mov bx, 0x7e00

int 0x13

mainLoop:
mov bx, intro
call printString
call newLine

mov bx, cmdBuffer
xor cx, cx
waitForKey:
    mov ah, 0
    int 0x16

    push bx
    push cx
    mov bx, badChar
    mov cl, 0x00
    cmpLoop:
        inc bx
        cmp ah, [bx]
        je popBack
        cmp [bx], cx
        jne cmpLoop
    pop cx
    pop bx
    jmp continue
    popBack:
        pop cx
        pop bx
        jmp waitForKey

    continue:
    mov ah, 0x0e
    cmp al, 0x0d
    je enterKey
    cmp al, 0x08
    je backspaceKey

    cmp cx, 63
    je waitForKey

    int 0x10
    mov [bx], al
    inc bx
    inc cx

    jmp waitForKey