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diff --git a/qemu/roms/openbios/forth/device/structures.fs b/qemu/roms/openbios/forth/device/structures.fs
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+\ tag: device interface structures
+\ 
+\ this code implements data structures used by the
+\ IEEE 1275-1994 Open Firmware Device Interface.
+\ 
+\ Copyright (C) 2003 Stefan Reinauer
+\ 
+\ See the file "COPYING" for further information about
+\ the copyright and warranty status of this work.
+\ 
+
+\ this file contains the struct definitions for the following 
+\ device tree structures:
+\   device-node
+\   active-package
+\   property
+\   instance
+
+
+struct ( instance )
+  /n field >in.instance-data            \ must go first
+  /n field >in.alloced-size							\ alloced size
+  /n field >in.device-node
+  /n field >in.my-parent
+  /n field >in.interposed
+  4 cells field >in.my-unit
+  2 cells field >in.arguments
+  \ instance-data should be null during packet initialization
+  \ this diverts access to instance variables to the dictionary
+constant inst-node.size
+
+struct ( device node )
+  /n field >dn.isize                    \ instance size (must go first)
+  /n field >dn.parent
+  /n field >dn.child
+  /n field >dn.peer
+  /n field >dn.properties
+  /n field >dn.methods
+  /n field >dn.priv-methods
+  /n field >dn.#acells
+  /n field >dn.probe-addr
+  inst-node.size field >dn.itemplate
+constant dev-node.size
+
+struct ( property )
+  /n field >prop.next
+  /n field >prop.name
+  /n field >prop.addr
+  /n field >prop.len
+constant prop-node.size
+
+struct ( active package )
+  /n field >ap.device-str
+constant active-package.size