9-23. In a 16-bit microcomputer instruction, in what
positions is the operation code located?
1. Bits 25 and 24
2. Bits 211 and 210
3. Bits 215 through 213
4. Bits 216 through 213
9-24. The formats of instructions on mainframe
computers vary greatly for all of the following
reasons except which one?
1. Manufacturer of the computer
2. Generation of the computer
3. Memory size of the computer
4. Type of computer
QUESTIONS 9-25 THROUGH 9-33 PERTAIN TO
THE EXAMPLE INSTRUCTION FORMATS FOR A
MAINFRAME COMPUTER WITH 32-BIT
INSTRUCTIONS ON PAGES 8-8 THROUGH 8-10 IN
THE TRAMAN.
9-25. A total of how many basic instruction formats is
given?
1. One
2. Five
3. Seven
4. Nine
9-26. Which of the following fields is/are consistent in
all the instruction formats?
1. Designator field (a) only
2. Function code (f) only
3. Designator field (a) and function code (f)
4. Function code (f) and subfunction code (f2)
9-27. The “a” field is used to identify all except which
of the following registers?
1. Stack pointer
2. Accumulator
3. Memory
4. Index
9-28. Basic load, store, replace, and simple
mathematical operations are performed using what
instruction format?
1. I
2. II
3. IV-B
4. V
9-29,
9-30,
9-31.
9-32.
9-33.
Format II instructions perform all except which of
the following types of operations?
1. Interrupt
2. I/O commands
3. Single precision mathematics
4. Program sequence control jumps
What is the maximum value of a subfunction code
of (a) two bits and (b) three bits?
1. (a) 2 (b) 3
2. (a) 2 (b) 7
3. (a) 3 (b) 5
4. (a) 3 (b) 7
Formats IV-A and IV-B are half-word instructions
and two of them may be stored in one memory
word. Which of the following methods is used to
keep track of upper/lower instruction execution?
1. Active status register
2. Indirect addressing mode
3. Monitor clock
4. Accumulator
For operations such as setting, clearing, or testing
an individual bit, what instruction format is used?
1. IV-B
2. IV-C
3. III
4. II
For single- and double-precision floating-point
math operations, what instruction format should
be used?
1. I
2. II
3. III
4. V
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