HP owners - BOUNTY

[Jay West]

Reposting, I'm a little worried these do not exist anymore. I've already
tried every reseller on the planet. Generous Bounty for any of the
following:

 

HP 12920B Asynchronous Multiplexer :

12920-60001 Upper Select Code Data Board 

12920-60002 Lower Select Code Data Board 

12922-60001 Control Board 

 

Or

 

HP 12920A Asynchronous Multiplexer: 

12921-60001 Upper Select Code Data Board 

12921-60002 Lower Select Code Data Board 

12922-60001 Control Board

 

Even single boards of any of the above would be a big help.

 

Best,

 

J