CPS 1 (Ramm)			Spring 1995		     29 March 1995
				 Quiz #9
Name _______________________					Section _____

A. The circuit shown is the three bit adder discussed in class (without the
control circuits).  Show its use in adding the binary number 010 in the X
register and 011 in the Y register.
SHOW HOW ALL SWITCH AND RELAY CONTACTS WILL BE SET both by entering the
numbers to be added by way of the switch contacts and by the relay magnets
as a result of these actions.
	
(Show switch contacts that are closed or are left closed with a circle over
them.  Leave switch contacts that are opened or are left open, unmarked.
It will be assumed that all switch contacts that you do not circle are open.)
	































B. Mark which lights are lit up as a result of the addition by drawing an
X through them.  Give the sum, in binary, that the adder computes.
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C. True/False?

(1) Vacuum tube circuits are slower than relays.

(2) Vacuum tubes extremely reliable.

(3) Transistors use less power than vacuum tubes.

(4) Vacuum tubes are still used in many computer displays.

(5) Integrated circuits are relay circuits than can do calculus.