I thought it was an 8085. I believe there was CP/M
for the
displaywriter, and I remember seeing a flyer about a DOS upgrade, though
I dpon't know if it ever materialised.
It's certainly possible that there were earlier models using an 8085; I'm
positive that the model I worked with was an 8086 because I ported some of
that software I mentioned. I guess the original poster might have either.
Jim