Don't rely on CMB to have the datasheets for those mystery chips, even if they seem to
say that they do. Often what you'll get is a datasheet that says "No data
available".
You know, there's another (piece) of a Univac panel on eBay:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=8702180075
I speculate that someone's replaced the indicator lamp covers to read 1-2-4, instead
of the more logical 4-2-1 order.
Cheers,
Chuck