Forgot the great news. The other night I was searching NuBus info and got a hit for the Data Sheet on the generic 1988 version of the TI NuBus Transceivers Apple used in the DuoDock with their 1989 copyright and the TI logo on them.

The IIsi adapter packages have the same form factor/pincount with this H logo and 1989 Apple copyright as well.



credit: http://www.vectronicsappleworld.com/collection/maciisi.html

How different could three NuBus transceivers be, I wonder? }