I picked up "Future Mind" by Edward Lias, (c)1982 at UCSB, and the first
skimming shows it to be a pretty interesting book. Things I found interesting
were in the chapter titled "How Many Would You Like?", that included marketing
research type information. A couple of examples are Small Business Computer
Census and Minicomputer Census for 1980 that give the number of installations
for a number of computer vendors. Included are some that are not well known,
Modular Micro, Artronix, Bytronix, New England Digital Corp., etc. One of the
charts was a table showing the speed in operations per second for about 100
computers.
This is a pretty expensive book, but well worth the $1.00 or so that a number of
online bookstores are selling it for.