In January 2010 these paper tapes were read by a volunteer in
Datamuseum.dk, who "condensed" four messy moving boxes into one
neatly packed one.

The data read was forgotten on a work-server, where I happened to
stumble on recently.

I can tell from the logfiles, that all the paper tapes were all
read twice and compared.

The .tgz above contains only those paper-tapes which had DG product
numbers recorded.

Unfortunately it was not recorded at the time which tapes were
original DG product and which were "vanilla" tapes.

They came out of boxes from a Danish university ("AUC"), so any
file with "AUC" or Danish letters "æøåÆØÅ" in the name is probably
a local copy and possibly modified.

Conversely, I think it is a safe bet that any file with "copyright"
in the name was an original DGC product.

Many of the tapes have the product number as "visible" digits at
the front:

	00000080  7e 81 81 7e 00 00 76 89  89 76 00 00 86 89 49 3e  |~..~..v..v....I>|
	00000090  00 00 08 08 08 00 00 00  7e 81 81 7e 00 00 7e 81  |........~..~..~.|
	000000a0  81 7e 00 00 7e 81 81 7e  00 00 81 ff 80 00 00 00  |.~..~..~........|
	000000b0  7e 81 81 7e 00 00 7e 89  89 71 00 00 08 08 08 00  |~..~..~..q......|
	000000c0  00 00 7e 81 81 7e 00 00  e1 91 89 86 00 00 00 00  |..~..~..........|
	000000d0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|

and most have a unique trailer:

	00002cd0  00 00 00 00 00 00 00 00  00 00 00 00 aa 55 aa 55  |.............U.U|
	00002ce0  aa 55 aa 55 f4 63 64 2c                           |.U.U.cd,|
	00002ce8

I have found no documentation, and have not been able to reverse
engineer what the four bytes following aa55aa55aa55aa55 contains,
but I suspect a checksum of some sort ?

Poul-Henning