Do some binary addition and subtraction problems using
a scientific calculator. (see www.calculator.com for a variety
of calculators)
Signed binary numbers are written in what form?
An 8-bit group can represent signed numbers from + _____
to - _____ when written in 2s complement notation.
Write the 2s complement notation for the following numbers:
+127
-128
-90
-40
+40
+90
Binary adder and subtractor circuits are classified _____
(combinational, sequential) logic circuits. This type of logic
circuit _____ (has, does not have) a memory characteristic.
Can you find a scientific calculator that will do calculations
on hex numbers? (see www.calculator.com for a variety of calculators)
Refer to the adder/subtractor system
shown in Fig. 10-30, Digital Electronics,
7th edition. During addition the Cin input to the 1s
FA block is LOW which converts the full adder into a _____
adder circuit.
Refer to the adder/subtractor system
shown in Fig. 10-30, Digital Electronics,
7th.edition. What is the purpose of the XOR gates during
the subtraction process?
Refer to the figure below and use circuit simulation software to,
construct the 4-bit adder/subtractor system,
try several addition and subtraction problems, and
demonstrate the circuits operation to your instructor. <a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::::/sites/dl/free/0073126349/443700/fig10_1.gif','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (10.0K)</a>
