Valhalla 2720GS

[JFP]

I am trying to bring to live again a Valhalla DC calibrator 2720GS. Does anybody
know the password to reload the factory default data
have a jedec file of the EP900 PAL on the CPU (cause of the death of all the revision 2 of this calibrators : the first revision had no PALs but a combination of TTL to decode the addresses) ?