Intel 8085

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The term MPU is an advertising term. It stands for Mid Page Unit and is a type of advertisement which appears in an editorial page.

The Intel 8087 math coprocessor typically operates at clock frequencies of 5 MHz, 6 MHz, and 10 MHz, depending on the specific model and the system it's integrated with. It was designed to work in conjunction with the Intel 8086 and 8088 microprocessors, enhancing their mathematical computation capabilities. The 8087 facilitates floating-point arithmetic and other complex calculations, significantly improving performance for applications that require such processing.

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RET (return from subroutine) is an emulated instruction because its execution involves handling the return address and potentially changing the CPU state or context, which can vary based on different execution environments. In contrast, RETI (return from interrupt) is not emulated because it is directly supported by the hardware, allowing it to efficiently restore the previous execution state and enable interrupts, ensuring that the system can handle interrupts quickly and reliably. The distinction lies in the complexity and requirements of returning from different types of calls or states.

Privilege instructions are not executed in user mode to maintain system security and stability. User mode is designed to restrict access to critical system resources and hardware to prevent accidental or malicious interference. If user applications could execute privilege instructions, it could lead to system crashes, data corruption, and security vulnerabilities. Thus, such instructions are only allowed in kernel mode, where the operating system has full control over the hardware and system resources.

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The data structure that best supports indirect addressing mode is the linked list. In a linked list, each element (or node) contains a reference (or pointer) to the next element, allowing for dynamic memory allocation and easy traversal. This structure is particularly effective for indirect addressing because it enables the ability to access elements without needing to know their physical memory addresses directly. Additionally, it allows for efficient insertions and deletions, which are beneficial in scenarios where the data size can change frequently.

A register pair typically consists of two registers, each of which can contain a specific number of bits, commonly 8, 16, or 32 bits, depending on the architecture. Therefore, the total number of bits in a register pair is double the bit width of a single register. For example, if each register is 16 bits, the register pair would contain 32 bits.

If the READY pin remains unconnected in the 8085 microprocessor, the system will assume that the peripheral devices are always ready to communicate. This can lead to timing issues, as the CPU may attempt to read from or write to peripherals that are not prepared to handle the data, resulting in data corruption or system instability. To ensure proper operation, the READY pin should be connected to a suitable signal that indicates the readiness of connected devices.

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Maximal clock speed.

8085: ?

8085A: 3 MHz

8085AH: 5 MHZ

* Direct * Register Indirect * Based Mode * Indexed Mode * Scaled Indexed Mode * Based Indexed mode * Based scaled indexed mode * Based Indexed mode with displacement * Based scaled indexed mode with displacement

you can ask someone to help or a teacher or you can find out at a library or on the computer

1.8085 has multiplexed data lines where as Z80 does'nt has multiplexed lines.

2.8085 operates at 3-5MHz clock freq,But clock frequency of Z80 is 4-20MHz.

3.8085 contains 74 instructions and Z80 has 158 instructions.

4.8085 has 5 interrupts but Z80 has only 2.

5.8085 has no index register but Z80 has 2.

6.8085 contains SIM & RIM instructions, but Z80 does'nt .

it has 8 data buses and 16 adress buses....that is why it an 8 bit microprocessor

Any instructions,lessons outside the class room through correspondence, e- learning (internet) etc.

You can clear carry by using these two commands

STC // it will force to set the carry flag CF=1//

CMC //it willl complement that carry and you have done, CF=0 //

in single instruction u can reset carry by using any logical instruction. because logical operation resets carry always... eg. XRI 00h or ANI 0F

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Non Maskable interrupts (such as those generated by power failure) cannot be blocked by the CPU.

Maskable interrupts are common device interrupts such as disk/network adapters interrupts which can be blocked by the CPU.

7: 27 = 128

Each instruction requires specific time for the execution of instruction and this time is called instruction cycle. Each instruction cycle consists 1 to 5 machine cycle -- opcode fetch, memory read, memory write, IO read, IO write and each machine cycle consist 3 to 6 T - states. Time required to execute 1 T-state = 1/ operating frequency of 8085 Microprocessor for example operating frequency = 2MHz then time required to execute 1 T-state = 0.5 uSec example: Calculate time required to execute instruction MOV C, A sol: This instruction has one machine cycle i.e. opcode fetch (In any instruction 1st cycle is always opcode fetch and opcode fetch consists 4 to 6 T state depend on the operation of particular instruction) so to execute MOV C, A required 4T states so time required to execute this instruction is 4*0.5usec = 2usec any other queries pls contect: nileshbahadure2000@yahoo.co.in example:Calculate the time required to execute LXI H,2000H sol:Here we have to draw opcode fetch and two memory reads as two bytes 00H and 20H have to be read from memory. i.e, opcode fetch+Memory reads *2(bytes address) =4+3+3 so to execute LXI H,2000H,the required T-states is 10T and time is 10*0.5usec=5usec