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The X86 Microprocessors: Architecture and Programming (8086 to Pentium), 1st Edition
book

The X86 Microprocessors: Architecture and Programming (8086 to Pentium), 1st Edition

by Lyla B. Das
May 2024
Intermediate to advanced content levelIntermediate to advanced
665 pages
23h 2m
English
Pearson India
Content preview from The X86 Microprocessors: Architecture and Programming (8086 to Pentium), 1st Edition
BASICS OF COMPUTER SYSTEMS 27
Second step
is is the second group. For subtracting 0101 from 0010, borrowing of decimal 10 is taken
from the leftmost group.  us 0010 is ‘1100’, 12 in decimal. Subtracting ‘0101’ (5) from it, gives
‘0111’ (7) as shown.
0001 1100 1010 –
0101 0110
0111 0100
ird step
e leftmost group is now 0001. Subtract 0000 from it.  us, the fi nal answer is 174 in packed
BCD form.
0001 1101 1010 –
0000 0101 0110
0001 0111 0100
All this shows that BCD subtraction also needs extra care as BCD addition. In computers,
special instructions take care of this.
Example 0.17
Express the numbers 53 and 18 in packed BCD and subtract ...
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Publisher Resources

ISBN: 9781282663169