This set of Computer Organization and Architecture Multiple Choice Questions & Answers (MCQs) focuses on “Motarola 680X0 Processor Architecture – 2”.
1. The instructions in 68000 can deal with operands of three different sizes.
a) True
b) False
View Answer
Explanation: The operands are of different sizes because of the difference in the values.
2. As the instructions can deal with variable size operands we use ____________ to resolve this.
a) Delimiter
b) Size indicator mnemonic
c) Special assemblers
d) None of the mentioned
View Answer
Explanation: To indicate the size of the operand we use a separate variable mnemonic to indicate it.
3. The starting address is denoted using _________ directive.
a) EQU
b) ORIGIN
c) ORG
d) PLACE
View Answer
Explanation: The starting address is the location where the program is stored.
4. The constant can be declared using ___________ directive.
a) DATAWORD
b) PLACE
c) CONS
d) DC
View Answer
Explanation: To declare Global constants we use this directive.
5. To allocate a block of memory we use ___________ directive.
a) RESERVE
b) DS
c) DATAWORD
d) PLACE
View Answer
Explanation: None.
6. The Branch instruction in 68000 provides how many types of offsets?
a) 3
b) 1
c) 0
d) 2
View Answer
Explanation: The Branch instruction basically just adds a constant value to the address present in the PC, to change the instruction to be executed.
7. The purpose of using DBcc as a branch instruction is __________
a) It provides two conditions to be satisfied for a branch to occur
b) It provides a counter to check the number of times the branch as taken place
c) It is used to check the condition along with the branch condition
d) None of the mentioned
View Answer
Explanation: None.
8. The 68000 uses ____________ method to access I/O devices buffers.
a) Memory mapped
b) I/O mapped
c) Buffer mapped
d) None of the mentioned
View Answer
Explanation: In this method, both the I/O device and the memory share a common address space.
9. ____________ instruction is used to set up a frame pointer for the subroutines in 68000.
a) CREATE
b) LINK
c) UNLK
d) FRAME
View Answer
Explanation: This pointer is used to monitor the stack.
10. The LINK instruction is always followed by ____________ instruction.
a) MOV
b) UNLK
c) ORG
d) MOVEM
View Answer
Explanation: None.
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