The Carry bit actually has 9 possible inputs, so this 2-input
MUX is used to choose between one of the 8 inputs, or the
Carry signal from the ALU.
OSU8: Simple 8-Bit Microprocessor Design; Paul Stoffregen
http://www.pjrc.com/tech/osu8/sch/my_mux2b_psw.html
Last updated: November 28, 2003
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