push bp
        mov bp, sp
        
        ; push zero onto the stack and pop it into flags.
        ; some bits won't change
        xor ax,ax
        push ax
        popf
        pushf
        pop ax
        
        and ax, 0xf000 ;0f000h
        cmp ax, 0xf000 ;0f000h
        je lessthantwoeightsix
        
        ; marked as 286 (2)
        mov dl, 2
        
        mov ax, 0x7000 ;7000h
        push ax
        popf
        
        pushf
        pop ax
        and ax, 0x7000 ;7000h
        jz alldone
        
        ; mark as 386 (3)
        inc dl
        
        jmp alldone
        
lessthantwoeightsix:
        
        mov dl, 1
        
        mov al, 0xff ;0ffh
        mov cl, 0x21 ;21h
        shr al, cl
        
        ; if the shift leaves zero, it's a 8088 class cpu, else 80186/88
        jnz alldone
        
        ; Lets see if we have a V20/V30 (V)
        mov dl, 0x56 ;056h

        sti
        push si
        
        mov si, 0
        mov cx, 0xffff ;0ffffh
        ;rep lods [BYTE PTR es:si]
        rep lodsb
        
        pop si
        
        or cx, cx
        jz alldone
        
        ; mark as a 8088/8086 (0)
        mov dl, 0
        
alldone:
        ; store in ax
        xor dh, dh

        mov di, [bp]+6
        mov [di], dx
        pop bp
        retf 2