Processor Flags

Question 1

flags that change after arithmetic and logic instructions

Answer 1

Carry Flag
Overflow Flag
Zero Flag
Sign Flag
Auxiliary Flag
Parity Flag

COZSAP

Question 2

flags never change for any data transfer or program control operation

Answer 2

True

Question 3

What are the flags that set or reset on a certain number of bit or bit location?

Answer 3

Parity Flag (lower 8-bits only)
Auxiliary Flag (between bits 3 and 4)

Question 4

enables trapping through an on-chip-debugging feature

Answer 4

Trap Flag (TF)

Question 5

controls the operation of the INTR (interrupt request) input pin

Answer 5

Interrupt Flag (IF)
- STI (set I flag)
- CLI (clear I flag)

Question 6

selects either the increment or decrement mode for the DI and/or SI registers during string instructions

Answer 6

Direction Flag (DF)
- STD (set direction)
- CLD (clear direction)

Question 7

occurs when signed numbers are
added or subtracted

Answer 7

Overflow Flag (OF)

Question 8

Priority of current task

Answer 8

Input/Output Privilege Level (IOPL)

Question 9

indicates if current task is nested

Answer 9

nested task (NF)

Question 10

control flags

Answer 10

interrupt flag (IF)
direction flag (DF)
trap flag (TF)

Question 11

status flags

Answer 11

carry flag (CF)
parity flag (PF)
auxiliary flag (AF)
zero flag (ZF)
sign flag (SF)
overflow flag (OF)
nested task (NF)
input/output privilege level (IOPL)