Nope. The CDC 6400, 6600 were most definitely 60 and not 64 bit words. Instructions were either 15 or 30 bits long. 2-4 instructions per word.
IO was done by 10 (or 12 on the later series) peripheral processors. They had 12 bit words, and would read 60 bit words from the main memory, transferring them to 5 12 bit words in the process.
Multiple functional units in the 6600. Scoreboard, out of order execution, instruction lookahead. Everything like a modern RISC processor. Designed by Seymour Cray in the early 60s. A man a generation ahead of his time.
I'm pretty sure I've still got some of the manuals for this stuff at home.
Bob Kaplow NAR # 18L TRA # "Impeach the TRA BoD" >>> To reply, remove the TRABoD!