He has some notes about the missing ROR on his
Reference sheet page
http://www.benlo.com/6502.html
His writeing about the development of the world famoud Microchess
for the KIM is a true tale of the early days:
http://www.benlo.com/microchess2.html
Thanks for the reference - very interesting site. The baudot TTY brings
back memories, I had the same thing hooked to my SYM-1 in '78 or so; baudot
is so slow that I used a reed relay to switch the current loop.
I dug out the OSI 300 documentation, and it has a copy of the instruction
set pages from the MOS Technology data sheet missing the ROR. The Synertek
and Rockwell books from a couple of years later have it, though.