8086 was designed to make asm source porting from 8080 easy (not the other direction). It is not binary compatible with 8080, and not source-compatible either. 8080 is not an x86 CPU. 8080 is a more distant ancestor that had some influence on the design of 8086, but it’s not the same architecture.
Q. What was the Intel 8080 used for?
Although earlier microprocessors were used for calculators, cash registers, computer terminals, industrial robots, and other applications, the 8080 became one of the first widespread microprocessors….Intel 8080.
Table of Contents
- Q. What was the Intel 8080 used for?
- Q. What instruction set does Intel use?
- Q. What is 8085 instruction set?
- Q. How many instruction set are there in 8085?
- Q. What an instruction consists of?
- Q. What do you mean by instruction set?
- Q. How many instructions does in8085 have?
- Q. Is 3 byte A instruction?
- Q. Is out 2 byte instruction?
- Q. Why do we use stack pointer?
- Q. What is main stack pointer?
- Q. What is the size of stack pointer?
- Q. Where is stack pointer stored?
- Q. Where is stack pointer?
- Q. What is the position of stack pointer after the pop instruction?
- Q. What is stack with example?
| General information | |
|---|---|
| Predecessor | Intel 8008 |
| Successor | Intel 8085 |
Q. What instruction set does Intel use?
The same instruction set, x86, has been used since the 1980’s when Intel launched the 8086 CPU, and Intel signed an agreement with IBM to have AMD as a secondary producer of that processor.
Q. What is 8085 instruction set?
Arithmetic Group
| Instruction Set | Explanation | Flags |
|---|---|---|
| ADI data [A] ← [A] + data | Add immediate data to accumulator | All |
| ACI data [A] ← [A] + data + [CS] | Add with carry immediate data to accumulator | All |
| DAD rp [H-L] ←[H-L] + [rp] | Add register paid to H-L pair | CS |
| SUB r [A] ←[A]-[r] | Subtract register from accumulator | All |
Q. How many instruction set are there in 8085?
246 instructions
Q. What an instruction consists of?
The instruction set provides commands to the processor, to tell it what it needs to do. The instruction set consists of addressing modes, instructions, native data types, registers, memory architecture, interrupt, and exception handling, and external I/O.
Q. What do you mean by instruction set?
An instruction set is a group of commands for a CPU in machine language. The term can refer to all possible instructions for a CPU or a subset of instructions to enhance its performance in certain situations. Some instructions are simple read, write and move commands that direct data to different hardware.
Q. How many instructions does in8085 have?
– The 8085 uses a total of 246 bit patterns to form its instruction set. – These 246 patterns represent only 74 instructions.
Q. Is 3 byte A instruction?
Three-byte instructions – Three-byte instruction is the type of instruction in which the first 8 bits indicates the opcode and the next two bytes specify the 16-bit address. The low-order address is represented in second byte and the high-order address is represented in the third byte.
Q. Is out 2 byte instruction?
Three types of instruction are: 1-byte instruction, 2-byte instruction, and 3-byte instruction.
- One-byte instructions – In 1-byte instruction, the opcode and the operand of an instruction are represented in one byte.
- Two-byte instructions –
- Three-byte instructions –
Q. Why do we use stack pointer?
The Stack Pointer (SP) register is used to indicate the location of the last item put onto the stack. When you PUT something ONTO the stack (PUSH onto the stack), the SP is decremented before the item is placed on the stack.
Q. What is main stack pointer?
Main Stack Pointer (MSP) is the default stack pointer. It is used in the Thread mode when the CONTROL bit[1] (SPSEL) is 0, and it is always used in Handler mode. Stack operations like PUSH and POP instructions, and most instructions that use SP (R13) use the currently selected stack pointer.
Q. What is the size of stack pointer?
There is a stack pointer and a instruction pointer, the stack pointer having 8 explicit and 8 implicit bits (stack is always in the same 256-byte region) and thus the stack pointer register having 8 bits, the instruction pointer having 16 bits. The 8086, has an 16 bit databus and a 20 bit addressbus.
Q. Where is stack pointer stored?
Simpler processors store the stack pointer in a regular hardware register and use the arithmetic logic unit (ALU) to manipulate its value. Typically push and pop are translated into multiple micro-ops, to separately add/subtract the stack pointer, and perform the load/store in memory.
Q. Where is stack pointer?
The Stack Pointer register will hold the address of the top location of the stack. And the program counter is a register always it will hold the address of the memory location from where the next instruction for execution will have to be fetched.
Q. What is the position of stack pointer after the pop instruction?
In POP instruction, after each execution of the instruction, the stack pointer is a) incremented by 1 b) decremented by 1 c) incremented by 2 d) decremented by 2 Answer: c Explanation: The actual current stack top is poped into the specific operand as the contents of stack top memory is stored in AL&SP and further …
Q. What is stack with example?
Stack is a linear data structure which follows a particular order in which the operations are performed. The order may be LIFO(Last In First Out) or FILO(First In Last Out). There are many real-life examples of a stack. Consider an example of plates stacked over one another in the canteen.
