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Worksheets8085 Microprocessor Quiz
Total questions: 80
Worksheet time: 43mins
Which signal is used to indicate the completion of a memory read operation in 8085?
RD
WR
INTA
ALE
What is the function of the IN instruction in 8085?
Input data from a port to the accumulator
Output data from the accumulator to a port
Halt the processor
Read data from memory
During the Memory Write Cycle, which signal is activated?
RD
WR
INTA
IO/M
What state is the 8085 microprocessor in when it is not executing any instruction?
Wait State
Hold State
Halt State
Ready State
Which instruction is used to output data from the accumulator to an output port?
IN
OUT
STA
LDA
Which interrupt has the highest priority in 8085?
RST7.5
RST6.5
RST5.5
TRAP
What is the purpose of the INTA signal?
To acknowledge the IN instruction
To acknowledge the interrupt request
To acknowledge memory read operation
To acknowledge memory write operation
Which peripheral device is used for interfacing a keyboard and display with 8085?
8155
8255
8279
8251
The programmable peripheral interface (PPI) 8155 consists of how many ports?
1
2
3
4
What does the RST6.5 interrupt in 8085 do?
Resets the microprocessor
Triggers an interrupt vector at 0034H
Triggers an interrupt vector at 0024H
Triggers an interrupt vector at 0044H
The Memory Read Cycle is initiated by the (a) signal.
The (a) state occurs when the 8085 is waiting for a slow peripheral device.
The instruction used to halt the 8085 processor is (a) .
The timing diagram of the IN instruction involves the (a) signal to indicate data transfer.
During a Memory Write Cycle, the data is transferred to the (a) .
The TRAP interrupt in 8085 is (a) triggered.
The programmable peripheral interface 8155 can be used for (a) interfacing.
The RST5.5 interrupt vector address is (a) .
The 8279 is used for interfacing a (a) and display with the microprocessor.
The INTA signal is active during the _______ machine cycle.
Which signal indicates that 8085 is in the Memory Write Cycle?
RD
WR
IO/M
ALE
Which instruction is used to stop the execution of the program in 8085?
JMP
HLT
IN
OUT
In the timing diagram of the OUT instruction, which signal is used for data transfer?
RD
WR
INTA
IO/M
What is the purpose of the Hold State in 8085?
To halt the microprocessor
To wait for a peripheral device
To transfer control to another device
To read data from memory
Which of the following is not an interrupt in 8085?
RST5.5
RST6.5
RST7.5
RST4.5
The INTR interrupt is _______ triggered.
Edge
Level
Both edge and level
None of the above
Which signal is used to acknowledge an interrupt in 8085?
INTR
INTA
RST
TRAP
The 8279 interface is primarily used for which devices?
Memory
Keyboard and Display
Printer
Disk Drive
The programmable peripheral interface (PPI) 8155 includes how many timers?
1
2
3
4
What is the function of the RST7.5 interrupt in 8085?
Resets the microprocessor
Triggers an interrupt vector at 0024H
Triggers an interrupt vector at 003CH
Triggers an interrupt vector at 0044H
The Memory Write Cycle is indicated by the (a) signal.
The HLT instruction causes the microprocessor to enter the (a) state.
The OUT instruction is used to transfer data from the accumulator to the (a) .
During the Hold State, the (a) control is transferred to an external device.
The RST7.5 interrupt is (a) triggered.
The INTA signal is activated after receiving an (a) request.
The RST6.5 interrupt vector address is (a) .
The programmable peripheral interface 8155 is used for (a) interfacing.
The INTR signal is a (a) triggered interrupt.
Which state in 8085 is used when the microprocessor is not ready to accept data?
Wait State
Hold State
Halt State
Ready State
Which signal indicates the completion of a Memory Write Cycle?
RD
WR
IO/M
INTA
Which signal indicates the completion of a Memory Write Cycle?
RD
WR
IO/M
INTA
What is the main purpose of the IN instruction in 8085?
Output data from accumulator to a port
Input data from a port to the accumulator
Halt the microprocessor
Write data to memory
Which of the following states does 8085 enter during the execution of HLT instruction?
HoldState
HaltState
Ready State
WaitState
The timing diagram for the OUT instruction involves which signal?
RD
WR
INTA
IO/M
Which interrupt in 8085 is non-maskable?
RST5.5
RST6.5
TRAP
RST7.5
What does the RST5.5 interrupt do?
Resets the microprocessor
Triggers an interrupt vector at 0024H
Triggers an interrupt vector at 0034H
Triggers an interrupt vector at 002CH
The INT A signal is used to acknowledge which type of request?
Memory Read
Memory Write
Interrupt
I/O operation
The programmable peripheral interface (PPI) 8155 includes which of the following features?
Only input ports
Only output ports
Both input and output ports, and a timer
Only a timer
Which device is typically interfaced with 8279?
Printer
Memory
Keyboard and Display
Disk Drive
Fill in the Blanks: The (a) state is used when 8085 is waiting for a peripheral device to be ready.
Fill in the Blanks: The HLT instruction causes the processor to enter the (a) state.
Fill in the Blanks: The OUT instruction transfers data from the (a) to an output port.
Fill in the Blanks: The IN instruction reads data from an (a) port into the accumulator.
Fill in the Blanks: The TRAP interrupt is (a) triggered and has the highest priority.
Fill in the Blanks: The 8155 PPI device includes both (a) and output ports.
Fill in the Blanks: The RST7.5 interrupt vector address is (a) .
Fill in the Blanks: The INT A signal is active during the (a) acknowledge cycle.
Fill in the Blanks: The INTR interrupt is (a) triggered in 8085.
Fill in the Blanks: The 8279 interface is primarily used to control a (a) and display.
Which signal is used to indicate the start of a Memory Read Cycle in 8085?
RD
WR
IO/M
ALE
What is the purpose of the WR signal in 8085?
To initiate a memory read operation
To initiate a memory write operation
To output data to a port
To input data from a port
Which of the following is a maskable interrupt in 8085?
TRAP
RST7.5
RST6.5
Both b and c
The timing diagram for the IN instruction involves which signal for the input operation?
RD
WR
INTA
IO/M
Which of the following states occurs when 8085 is stopped after the execution of the HLT instruction?
HoldState
HaltState
WaitState
ReadyState
The RST6.5 interrupt triggers the microprocessor to execute which address?
0024H
0034H
002CH
003CH
Which of the following devices is typically interfaced using the 8155 PPI?
Keyboard
Display
General I/O devices
Printer
What is the function of the INT A signal in the interrupt process?
To request an interrupt
To acknowledge an interrupt
To clear an interrupt
To disable an interrupt
The 8279 device is commonly used for interfacing which of the following?
Analog sensors
Disk drives
Keyboards
Printers
Which interrupt in 8085 has the lowest priority?
RST5.5
RST6.5
INTR
RST7.5
Fill in the Blanks: The ALE signal is used to indicate the start of a (a) operation.
Fill in the Blanks: The WR signal is active during the (a) Write Cycle.
Fill in the Blanks: The TRAP interrupt is (a) triggered and cannot be masked.
Fill in the Blanks: The IN instruction reads data into the accumulator from the (a) port.
Fill in the Blanks: The 8155 PPI is used to interface (a) I/O devices with the microprocessor.
Fill in the Blanks: The RST6.5 interrupt vector address is (a) .
Fill in the Blanks: The INT A signal is used to acknowledge an (a) request.
Fill in the Blanks: The 8279 device is used to interface a (a) and display with the microprocessor.
Fill in the Blanks: The INTR signal has the (a) priority among the 8085 interrupts.
Fill in the Blanks: The HLT instruction places the microprocessor in the (a) state.
