I had tried to contact ditabeardmemo, but alas he has not responded to my PM as of yet. However, doing a bit of my own digging, I have found out that many Roland sound modules from the late 80's through the mid 90's had a port on the back that was labeled Mac/PC1/PC2. Apparently these modules had the Mac Midi interface built in.
I read a post here on the Roland JV-1010 and I couldn't help but notice how that unit looked much like my Korg 05R/W module which DOES have a port on the back labeled "host". It is in the exact 8 pin din connector as used on the Roland Sound canvas and on the Mac. As I recall I THINK this unit can also hook up to a Mac directly. I have to find my manual for it. BUT there you go, it may look like I have a Mac MIDI interface right under my nose and didn't know about it.