mov ax, 1687h
        int 2Fh
        test ax, ax             ; DPMI host installed?
        jnz nohost
        push es                 ; save DPMI entry address
        push di
        test si, si             ; host requires client-specific DOS memory?
        jz .nomemneeded         ; no -->
        mov bx, si
        mov ah, 48h
        int 21h                 ; allocate memory
        jc nomemory
        mov es, ax
.nomemneeded:
        mov si, msg.debuginfo
        call printstring
        int3
        mov bp, sp
        mov ax, 0001h           ; start a 32-bit client
        call far [bp]           ; initial switch to protected-mode
        jnc initsuccessful
initfailed: