netbsd /boot.cfg

oot (hd0,0,a)       # NetBSD on 1st MBR partition of 1st IDE disk
 Filesystem type is ffs, partition type 0xa9
chainloader +1

:-(
>> NetBSD/x86 BIOS Boot, Revision 5.2 (from NetBSD 5.0_BETA)
>> Memory: 639/3406528 k

     1. Boot normally
     2. Boot single user
     3. Boot Xen with 2GB for dom0
     4. [NEW]Boot Xen with 2GB for dom0
     5. [5]Boot Xen with 2GB for dom0
     6. Boot Xen with single-user mode
     7. Disable ACPI
     8. Disable ACPI and SMP
     9. Drop to boot prompt

Choose an option; RETURN for default; SPACE to stop countdown.
Option 5 will be chosen in 0 

root (hd0,0,a)       # NetBSD on 1st MBR partition of 1st IDE disk
 Filesystem type is ffs, partition type 0xa9
chainloader +1

:-(
>> NetBSD/x86 BIOS Boot, Revision 5.2 (from NetBSD 5.0_BETA)
>> Memory: 639/3406528 k

    A. Boot normally
    B. Boot single user
    C. Boot Xen with 2GB for dom0
    D. [NEW]Boot Xen with 2GB for dom0
    E. [5]Boot Xen with 2GB for dom0
    F. [5.bak]Boot Xen with 2GB for dom0
    G. Boot Xen with single-user mode
    H. Disable ACPI
    I. Disable ACPI and SMP
    J. Drop to boot prompt