Some tidbits about the bufferboard:

Apparently there were 3 different versions:

https://archive.org/details/TheBufferboardManualAppleIIGrapplerEpsonAppleParallel/page/n1/mode/2up


[Linked Image from i.imgur.com]


Interestingly, this brochure says that the Buffered Grappler + is not Apple III compatible.

Maybe it has something to do with the 6M / 7M clock thing?

This bufferboard brochure says that the BufferBoard is Apple III compatible.

[Linked Image from i.imgur.com]

https://archive.org/details/GrapplerBufferboardBrochureAppleII1983OrangeMicro