🏠 Home > An Introduction To Microprocessor 8085
← Back to Home
📚 An Introduction To Microprocessor 8085 MCQs
Category: Computer Science
Total Questions: 2705
Chapters: 15
About An Introduction To Microprocessor 8085
Think of the Microprocessor 8085 as the "brain" of a simple computer, all packed onto a single tiny silicon chip. Before we can understand this brain, we must understand its history and how it evolved from larger, room-sized computers to this powerful chip. To make learning easier, the journey starts with three chapters on a concept called Simple as Possible (SAP) . These are like training wheels. SAP-I is the most basic computer that can only perform a few tasks. SAP-II adds more memory and instructions, and SAP-III adds a stack and subroutines. By understanding how these simple computers are built, you learn the fundamental building blocks—like memory, registers, and an arithmetic logic unit—that all computers, including the 8085, are made of.
Now that you understand the basics, we move to the star of the course: The 8085 Microprocessor. This is an 8-bit microprocessor, meaning it can process 8 bits of data at a time. Unlike its predecessor, the 8080, the 8085 has a major advantage—it uses a single +5-volt power supply, making it simpler to use (the "5" in 8085 refers to this). It has 40 pins and is the Central Processing Unit (CPU) for many early personal computers. The 8085 works by fetching instructions from memory, decoding them, and then executing them. To do this, it uses internal "registers" as temporary storage and follows a specific "programming model" which dictates how we, as programmers, can tell it what to do.
To make the 8085 work, we must give it instructions, which is the topic of Programming of 8085. This involves writing code using the processor's specific set of commands, called its "Instruction Set." These instructions are often written in a low-level language called Assembly Language. But a microprocessor doesn't just process data; it also needs to handle events that happen unexpectedly, like when you press a key on a keyboard. This is done using Interrupt Instructions. Interrupts are like a doorbell; they pause the main program, tell the 8085 to handle an urgent task (like reading the key pressed), and then resume the main program. This ability to react to external events is crucial for a microprocessor to be interactive and useful.
A microprocessor on its own is useless; it needs to "talk" to other devices like screens, keyboards, and motors. This "talking" is called Interfacing, and it's the subject of the final chapters. To manage this communication, the 8085 uses specialized support chips. For example, the PPI 8255A is a general-purpose interface for connecting keyboards and LEDs. The 8253 acts as a timer to create precise delays. The 8279 manages keyboard input and display output, while the 8259 handles multiple interrupts. The 8257 allows devices to access memory directly (DMA) for fast data transfer. Finally, we can even connect the 8085 to the analog world using A/D and D/A Converters and communicate with other computers using Serial Communication chips. All these components come together to build a complete working system, showcasing the powerful Applications of Microprocessors in everything from washing machines to early personal computers.
Practice chapter-wise MCQs for An Introduction To Microprocessor 8085. This book contains 15 chapters and 2705 questions across easy, medium, and hard difficulty levels.
📚 Chapters
1. Evolution and History of Microprocessors
📝 Address Bus in Microprocessor System
📝 Basic microprocessor system architecture
📝 Computer Programming Languages for Microprocessor
📝 Control Bus in Microprocessor System
📝 Data Bus in Microprocessor System
📝 Evolution and history of microprocessors
📝 High Level Programming Language for Microprocessor
📝 Introduction to 8 Bit Microprocessor 8080A
📝 Low Level Programming Language for Microprocessor
📝 Microprocessor introduction and basics
151 MCQsView Chapter →
2. Simple as Possible (SAP) - I
📝 Accumulator of Simple as Possible (SAP) I Computer
📝 Adder Subtractor of Simple as Possible (SAP) I Computer
📝 Architecture of Simple as Possible (SAP) I Computer
📝 B Register of Simple as Possible (SAP) I Computer
📝 Controller Sequencer of Simple as Possible (SAP) I Computer
📝 Design of Program Counter of Simple as Possible (SAP) I Computer
📝 Execution Cycle of Simple as Possible (SAP) I Computer
📝 Fetch Cycle of Simple as Possible (SAP) I Computer
📝 Hardware Design of Simple as Possible (SAP) I Computer
📝 Instruction Register of Simple as Possible (SAP) I Computer
📝 Instruction Set of Simple as Possible (SAP) I Computer
📝 Memory Unit of Simple as Possible (SAP) I Computer
📝 Output Register of Simple as Possible (SAP) I Computer
📝 Programming of Simple as Possible (SAP) I Computer
📝 Working of Simple as Possible (SAP) I Computer
161 MCQsView Chapter →
3. Simple as Possible (SAP) - II
📝 Addressing Modes of SAP II Computers
📝 Architecture of SAP II Computer
📝 Assembly Language Programming for SAP II Computers
📝 Delay Calculations for SAP II Computers
📝 Flags of SAP II Computers
📝 Instruction Set of SAP II Computers
📝 Instruction Types of SAP II Computers
📝 Machine Cycle and Instruction Cycle in SAP II Computers
169 MCQsView Chapter →
4. Simple as Possible (SAP) - III
📝 Arithmetic Group of Instructions of SAP-III Computer
📝 Branch Group of SAP-III Computer
📝 Data Transfer Group of SAP-III Computer
📝 Instruction Set of SAP-III Computer
📝 Logic Transfer Group of SAP-III Computer
📝 Programming Model of SAP-III Computer
📝 Stack and I/O Instructions of SAP-III Computer
📝 Time Delay Introduced by a Register Pair of SAP-III Computer
222 MCQsView Chapter →
5. The 8085 Microprocessor
📝 Address Buffer and Address Data Buffer of 8085 Microprocessor
📝 Architecture of 8085 Microprocessor
📝 Arithmetic and Logical Unit (ALU) of 8085 Microprocessor
📝 Instruction Set of 8085 Microprocessor
📝 Interrupt Control of 8085 Microprocessor
📝 Pin Description of 8085 Microprocessor
📝 Register Section of 8085 Microprocessor
📝 SAP-III Timing Diagram and Registers of 8085 Microprocessor
📝 Timing and Control Unit of 8085 Microprocessor
📝 Timing Diagram for 8085 Instructions
📝 Timing Diagram of IN byte of 8085 Microprocessor
📝 Timing Diagram of LXI rp, dbyte of 8085 Microprocessor
📝 Timing Diagram of MOV M, reg of 8085 Microprocessor
📝 Timing Diagram of MOV reg, M of 8085 Microprocessor
📝 Timing Diagram of MOV reg2, reg1 of 8085 Microprocessor
📝 Timing Diagram of MVI M, data of 8085 Microprocessor
📝 Timing Diagram of XCHG of 8085 Microprocessor
215 MCQsView Chapter →
6. Programming of 8085
📝 ASCII to Binary Conversion in 8085 Microprocessor
📝 BCD to Binary Conversion in 8085 Microprocessor
📝 Binary to ASCII Conversion in 8085 Microprocessor
📝 Binary to BCD (Unpacked) Conversion in 8085 Microprocessor
📝 Miscellaneous Programs in 8085 Microprocessor
📝 Progams on addition and subtraction in 8085 Microprocessor
📝 Program on 8 Bit Division in 8085 Microprocessor
📝 Program on Multiplication in 8085 Microprocessor
📝 Programs to arrange series in 8085 Microprocessor
📝 Programs to find largest or smallest number in 8085 Microprocessor
📝 Simple Programs in 8085 Microprocessor
188 MCQsView Chapter →
7. Interrupt Instructions of 8085
📝 Data Transfer Schemes in 8085 Microprocessor
📝 Direct Memory Access (DMA) Data Transfer in 8085 Microprocessor
📝 Hardware Interrupts in 8085 Microprocessor
📝 I/O Mapped I/O or Isolated I/O in 8085 Microprocessor
📝 Interrupt Control Circuit in 8085 Microprocessor
📝 Interrupt Driven I/O Data Transfer in 8085 Microprocessor
📝 Interrupt Instructions in 8085 Microprocessor
📝 Memory Mapped I/O in 8085 Microprocessor
📝 Programmed I/O Data Transfer in 8085 Microprocessor
📝 Serial Input and Output Data Transfer in 8085 Microprocessor
📝 Software Interrupts in 8085 Microprocessor
📝 The Interrupts in 8085 Microprocessor
185 MCQsView Chapter →
8. Programmable Peripheral Interface (PPI) 8255A
📝 8255A Operational Modes
📝 Bit Set/Reset(BSR) Mode in 8085 Microprocessor
📝 Control Word Format for 8255A
📝 Details of PPI IC 8255A
📝 Input Control Signals in Mode 1 for 8255A
📝 Output Control Signals in Mode 1 for 8255A
📝 Programming in Mode 0 for 8255A
📝 Programming in Mode 1(strobed Input/Output) for 8255A
📝 Programming in Mode 2 (Strobed Bidirectional Bus I/O)
163 MCQsView Chapter →
9. Programmable Interval Timer/Counter: 8253
📝 8253 Interfacing and Programming
📝 Block Diagram of 8253
📝 Control Word Format of 8253
📝 INTEL Programmable Interval Timer 8253
📝 Logics for Counters of 8253
📝 Programming of 8253 in Mode 0: Interrupt on Terminal Count
📝 Programming of 8253 in Mode 1: Programmable One Shot
📝 Programming of 8253 in Mode 2: Rate Generator
📝 Programming of 8253 in mode 3: Square Wave Generator
📝 Programming of 8253 in mode 4: Software Triggered Strobe
📝 Programming of 8253 in mode 5: Hardware Triggered Strobe
146 MCQsView Chapter →
10. Programmable Keyboard and Display Interface: 8279
📝 8253 Timer Chip
📝 Block Diagram of 8279
📝 Display Interface of 8279
📝 Display Modes of 8279
📝 Display Write Inhibit/Blanking of 8279
📝 End Interrupt/Error Mode Set of 8279
📝 Functional Description of 8279
📝 INTEL Programmable Keyboard/Display Interface 8279
📝 Interfacing of 8279 with 8085
📝 Key Board San of 8279
📝 Keyboard/Display Mode Set of 8279
📝 Left Entry Mode(Type Writer Mode) of 8279
📝 N key Rollover of 8279
📝 Program Clock of 8279
📝 Programming of 8279
📝 Read Display RAM of 8279
📝 Read FIFO/Sensor RAM of 8279
📝 Right Entry Mode(Calculator Mode) of 8279
📝 Scanned Keyboard of 8279
📝 Scanned Sensor Matrix of 8279
📝 Status Register(IN Operation) of 8279
📝 Strobed Input of 8279
📝 Two key Lockout of 8279
225 MCQsView Chapter →
11. Programmable Interrupt Controller: 8259
📝 Block Diagram of 8259
📝 Fully Nested Mode (FNM) of 8259A
📝 Initialization Command Words(ICWs) of 8259
📝 Initialization of 8259
📝 Interfacing of 8259A with 8085A
📝 Interrupt Modes of 8259A
📝 Operation Command Words (OCWs) of 8259
📝 Polled Mode of 8259A
📝 Programmable Interrupt Controller 8259
📝 Rotating Priority Mode of 8259A
📝 Special Mask Mode of 8259A
📝 Status Read Operation of 8259
📝 Vectoring Data Formats for 8259
162 MCQsView Chapter →
12. Direct Memory Access Controller: 8257
📝 Block Diagram of 8257
📝 Control Logic of 8257
📝 Data Bus Buffer of 8257
📝 DMA Channels of 8257
📝 DMA Interfacing Circuit of 8257
📝 Mode Set Register of 8257
📝 Programming of 8257
📝 Read/ Write Logic of 8257
📝 Status Word Register of 8257
122 MCQsView Chapter →
13. Interfacing Data converters: A/D and D/A Converters
📝 A/D Converter Using D/A Converter and Software in 8085 Microprocessor
📝 ADC 0808/0809 in 8085 Microprocessor
📝 Analog to Digital Converter in 8085 Microprocessor
📝 Binary Ladder D/A Converter in 8085 Microprocessor
📝 Counter or Digital Ramp Type A/D Converter in 8085 Microprocessor
📝 D/A Converter IC 0808 in 8085 Microprocessor
📝 Digital to Analog Converter in 8085 Microprocessor
📝 Dual Slope A/D Converter in 8085 Microprocessor
📝 Interfacing of D/A Converter in 8085 Microprocessor
📝 Microprocessor Compatible D/A Converter in 8085 Microprocessor
📝 Performance Criteria for D/A Converter in 8085 Microprocessor
📝 Resistive Divider D/A converter in 8085 Microprocessor
📝 Simultaneous A/D Converter in 8085 Microprocessor
📝 Single Slope A/D Converter in 8085 Microprocessor
📝 Successive Approximation A/D Converter in 8085 Microprocessor
205 MCQsView Chapter →
14. Serial Communication and Programmable Communication Interface
📝 Asynchronous Software Approach IC 8251 in 8085A Microprocessor
📝 Block Diagram of 8251A in 8085A Microprocessor
📝 Initialization of 8251A in Asynchronous Mode in 8085A Microprocessor
📝 Initialization of 8251A in Synchronous Mode in 8085A Microprocessor
📝 Interfacing of 8251A in 8085A Microprocessor
📝 Modem Control in 8085A Microprocessor
📝 Modem IC 8251 in 8085A Microprocessor
📝 Programmable Communication Interface IC 8251 in 8085A Microprocessor
📝 Programming of 8251A in 8085A Microprocessor
📝 Read/Write Control Logic in 8085A Microprocessor
📝 Receiver Section in 8085A Microprocessor
📝 Serial Communication Standard IC 8251 in 8085A Microprocessor
📝 Serial Data Communication IC 8251 in 8085A Microprocessor
📝 Transmitter Section in 8085A Microprocessor
174 MCQsView Chapter →
15. Applications of Microprocessor
📝 8085 Microprocessor Based Automatic School bell system
📝 8085 Microprocessor Based LED Dial Clock
📝 8085 Microprocessor Based Stepper Motor Control
📝 8085 Microprocessor Based Temperature Controller
📝 8085 Microprocessor Based Traffic Light
📝 8085 Microprocessor Based Washing Machine Controller
📝 8085 Microprocessor Based Water Level Controller
📝 Design of 8085 Microprocessor Based Running light
📝 Real Time Clock with On/Off Timer in 8085 Microprocessor
217 MCQsView Chapter →