Computer Organization Quiz on “Motarola 680X0 Processor Architecture”.
1. The instructions in 68000 can deal with operands of three different sizes.
a) True
b) False
Answer: a
Clarification: 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
Answer: b
Clarification: 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
Answer: c
Clarification: 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
Answer: d
Clarification: 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
Answer: b
Clarification: None.
6. The Branch instruction in 68000 provides how many types of offsets?
a) 3
b) 1
c) 0
d) 2
Answer: d
Clarification: 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
Answer: d
Clarification: 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
Answer: a
Clarification: 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
Answer: b
Clarification: 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
Answer: d