I'd be interested in a copy as well.
My elementary school was part of the Memphis State campus, and I was often around the Math building computer rooms remotely fooling around on the Sigma 9. Dr. Windeknecht had a lab full of OSI C2-8P's in the math building. There were always at least a couple of grad students writing programs using Dr. Windeknecht's BREVITY assembler, written by Dr. W. I never met him, but I did chat with his students, who seemed to enjoy hacking on the OSI machines.
At the time, my understanding was that BREVITY used a more compact notation than a standard assembler, so programs written in BREVITY took up less space, and a small machine could hold a larger source in RAM. This was in the 70's, so RAM footprint was a thing.
I never got to use any of those machines--only look at them, so I couldn't tell you much about them. I'm pretty sure all the machines were cassette based. I couldn't say if BREVITY was in EPROM or loaded from tape, but I had the impression that it was in EPROM, replacing the ROM BASIC.
I wasn't aware of the book. After reading your post, I found and bought a copy.
It looks like there is a paper about BREVITY in the NCC '79 proceedings: Windeknecht, T. G., "BREVITY: An Assembly Language for the 6502 Microprocessor," NCC '79 Personal Computing Proceedings, New York, 1979. I wonder how hard it would be to find a copy of those proceedings.
