Number Guessing for R16K1S60

reset:
    mov bx, 0
    mov dx, 0x8000
    mov ex, 0
loop:
    mov ax, bx
    add ax, dx
    shr ax, 1
    add ex, 1
    send 3, ax
    wait cx
    cmp cx, 1
    ja toohigh
    jb toolow
    send 3, ex
    hlt
    jmp reset
toohigh:
    mov dx, ax
    jmp loop
toolow:
    mov bx, ax
    jmp loop