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The 8086 forms a 20 bit address by adding the effective address (a 16 bit value) to a segment register (another 16 bit value) which is left shifted by 4. That gives a 20 bit address in the range of 00000H to FFFFFH.
cs register holds the base address (16 bit) and the IP has the offset.
(ex):
CS --->348A
IP --->4214(offset)
generation of 20 bit:
CS*10+IP
(ie)
348A0
04214 +
----------------------
38AB4(20 BIT)
----------------------
Wiki User
∙ 11y ago
Wiki User
∙ 13y agoComplete effective (or external or Physical) address is calculated with: 1) Segment resistors 2) offset resistors. Let us take a example and solve the complicated issue.
Segment address ----> 1005h (h stands of hexadecimal)
Offset address -------> 5555h
Segment address (In Binary) --------------------> 0001 0000 0000 0101
Shifted by 4 bit positions Left with carry ------> 0001 0000 0000 0101 0000
+
(Add) offset address (in Binary)------------------> 0000 0101 0101 0101 0101
Therefore, we get Physical Address-------------> 0001 0101 0101 1010 0101
Physical address (in hexadecimal) --------------> 155A5h
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What is physical address in 8086 microprocessor?
Physical address in the 8086/8088 is {Selected Segment Register} * 16 + {Effective Offset Address}. It is a 20-bit address .
Size of 8086 address bus?
The 8086/8088 has an internal 20-bit address bus and 16-bit data bus. Externally, the address bus is 20-bits, and the data bus is 16-bits for the 8086 and 8-bits for the 8088.The data bus in the 8086 is 16 bits in size, while the address bus is 20.
What it the size bit address for 8085 and 8086?
128Kb
What is higher order address of a 16 bit address?
In the 8085, the high order address is A8-A15. In the 8086/8088, the high order address is A8-A19. (For a 16-bit address, the answer is A8-A15, but the answer above reflects the chosen categories, 8085 and 8086/8088, with the 8086/8088 running in 20-bit mode.) In Windows XP, running in 32-bit mode, the high order address is A8-A31, a 32 bit address.
How many address lines are required to access 1MB RAM using microprocessor 8086?
The 8086/8088 microprocessor has a 20 bit address bus, so the number of memory locations it can address is 220 or 1,048,576.
What is the difference between 8086 and 8088 microprocessor?
The difference between the 8086 and the 8088 is that the 8086 has a 16 bit data bus and that the 8088 has an 8 bit data bus. Both processors are the same 16 bit processor, and both have a 20 bit address bus. The 8086 is twice as fast as the 8088 in terms of data transfer rate on the bus for the same bus clock speed.
Why memory is divided in even and odd banks in 8086 microprocessor?
in 8086 there is 20 bit address bus,so it can address 1,048,576 address. At each address we can store 8 bit address (1-byte)but if want to write a word(16-bit)into a memory segment to store data in byte form then we write the data in two consecutive memory address which are even(low) and odd(high) memory.
What is the Comparison between 8086 and 80286 in micro processor?
The 8086/8088 is a 16 bit processor running on a 16 bit (8086) or 8 bit (8088) bus with a 20 bit address. It can address 1 MB of memory. Addressing consists of adding the program's effective address to the (left shifted by 4) value of one of the segment registers. Think of segments as multiple 64kb regions of memory, overlapping at a distance of 16 bytes.The 80286 is a 16 bit processor running on a 16 bit bus with a 24 bit address. It can address 16mb of memory.In real mode, it operates the same as an 8086. This is the power on reset state. In protected mode, the segment register changes meaning. Instead of a segment address (left shifted by 4 base address), the segment register is an index into a page descriptor table, which is a table that supports virtual mode. Each element in the page descriptor table also contains information about the protection status of that page, so that page protection can be provided.Unfortunately, since the meaning of the segment register changed, the 80286 was not object code compatible with programs written for the 8086/8088. This is one of the factors that made the 80286 unpopular.
Difference between 8086 and 80386?
There are several differences between the 8086 and the 80386. Two notable differences: 1.) the 8086 is a 16 bit computer, while the 80386 is a 32 bit computer, and 2.) the 8086 does not support virtual addressing while the 80386 does.8086 is 8 bit processor and 80386 is 16 bit processor
How do you address 1GB memory with 8085 or 8086?
You cannot address 1GB memory with the 8085 or the 8086/8088 without some kind of external demultiplexor that is software controlled. The address bus on the 8085 is 16 bits, giving addressibility of 64KB; while the address bus on the 8086/8088 is 20 bits, giving addressibility of 1MB. To address 1GB, you need a 30 bit address bus.
What is ic 8086?
8086 is a 16- bit microprocessor. It has 20-bit address bus. It has 14 16-bit registers. It has multiplexed address and data bus. It provides 33% duty cycle. 8086 supports multiprogramming. It is designed to operate in two modes, i.e. min and max. you can download the simulation program(for running your programs on your computer) at - http://www.ziddu.com/download/15018415/emu_8086.zip.html
What is the difference between the Intel 8085 and the Intel 8086?
The Intel 8085 is an 8 bit microprocessor created in 1977.The Intel 8086 is a 16 bit microprocessor created in 1978. The 8086 was the first chip to start the x86 architecture family.8085 contains 16-bit address bus and 8-bit data bus8086 contains 20-bit address bus and 16-bit data bus..In 8085 the clock speed is 3MHZwhere as in 8086 the clock speed is 5MHZ.there are two differences btw 8085&80861. 8086 has 6 byte queue but 8085 has 4 byte queue2. 8086 has 16 bit data bus where as 8085 has 8 bit data bus
