I missed being specific in my original email, I was seeking version
1.1 of DECnet for Rainbow [1]
As everyone likely knows, but might have forgotten, the Rainbow was
incompatible with the IBM PC world for both communications and
graphics (there was software that fixed other differences assuming a
well-behaved DOS application). I would be glad to use DECnet over a
serial port on the Rainbow.
I had an idea there was a third-party Ethernet card for the Rainbow
but the Rainbow only has three expansion options keyed to specific
option types (hard-drive, memory, graphics), if you wanted Ethernet
you had to remove one of the options and give up that capability.
[1] Bob's mention that the DECnet for DOS mentions Rainbow is
interesting, will take a look. Given there was a specific product I
wonder why it is mentioned in the DOS version, unless the so-called
DECnet for Rainbow was in fact DECnet for DOS but simply delivered on
Rainbow diskettes (due to their system-specific format).