Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Which of the instructions should be added to the code fragment below to check whether the Left Shift key currently is pressed down?
See corresponding keyboard status bits in the picture:
Insert ON
CapsLock ON
NumLock ON
0000:0417
xor
mov
O
mov
Select one:
bx, bx
es, bx
al, es:0417h
jz
noLShift
Choose missing instruction to insert in the code line marked by the comment "MISSING INSTRUCTION".
and
or
xor
test
and
al, 11111101b
ScrollLock ON
Alt Down
Ctrl Down
al, 2
al, 4
al, 00000010b
bl, 00000010b
LShift Down
RShift Down
; MISSING INSTRUCTION
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Transcribed Image Text:Which of the instructions should be added to the code fragment below to check whether the Left Shift key currently is pressed down? See corresponding keyboard status bits in the picture: Insert ON CapsLock ON NumLock ON 0000:0417 xor mov O mov Select one: bx, bx es, bx al, es:0417h jz noLShift Choose missing instruction to insert in the code line marked by the comment "MISSING INSTRUCTION". and or xor test and al, 11111101b ScrollLock ON Alt Down Ctrl Down al, 2 al, 4 al, 00000010b bl, 00000010b LShift Down RShift Down ; MISSING INSTRUCTION
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