Re: Chipsandcheese article on the CDC6600

Errors in the text::
a) the use of the word non-blocking n the sense that increment does not
   block MUL is weird, we use the tern nowadays within a FU not between.
b) CDC 6600 is NOT in-order, the whole motivation for the scoreboard is
   to enable Out-or-Order execution.
c) At its introduction, the word cache had not yet been invented--so
   sure it had no cache and thereby had to have powerful central memory.
   (banked and interleaved).
d) It did have a branch predictor--it predicted backwards branches were
   taken.
e) The strange notion of self modifying code needing to be 32
instructions
   in advance of the instruction being modified is also weird.
f) It is not In Order, the scoreboard tacks RAW and WAR hazards and
   prevents WAW from passing out of the decoder. Then execution order
   is based on the availability of operands (typical) and the
availability
   of a result bus (novel).
g) Oh and BTW, there were 20 ports to the register fileS
h) the 2 increment units were 2 sets of operand registers but 1 ALU, and
   ALU could not do back to back integer ADDs.
Other than that, not bad.