Index: alien/orcad/page.txt
===================================================================
--- alien/orcad/page.txt	(nonexistent)
+++ alien/orcad/page.txt	(revision 9406)
@@ -0,0 +1,34 @@
+(little endian)
+
+The page file is a tree. The root of the tree is a page object.
+
+Page file structure:
++--------+----------------------------------------+
+|pri hdr | +----------+ +-----------+ +---------+ |
+|        | |aux hdr #1| |closing hdr| | payload | |
+|9 bytes | |type=0xa  | |type=0xa   | |         | |
+|        | |          | |(MAGIC)    | |         | |
+|type=0xa| +----------+ +-----------+ +---------+ |
++--------+----------------------------------------+
+
+
+Object structure:
+	Primary header is 9 bytes long:
+		- type: 1 byte
+		- len: 4 bytes
+		- unknown: 4 byte (usually all-zero)
+	Data: len number of bytes
+
+Payload may start with aux headers:
+	- this is recognised by the first byte matching the main header's type byte
+	- these subsequent headers do not allocate or address further data blocks
+	- the last header is the closing header and has a different structure:
+		- the length of this header is the length field of the previous header
+		- structure:
+			- type: 1 byte (matching the main header)
+			- the length of this header is known
+			- the last 8 bytes of this header is a magic number
+				0xFF 0xE4 0x5C 0x39 0x00 0x00 0x00 0x00
+
+Payload:
+	
\ No newline at end of file