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1978 - 8086
1979 - 8088
First IBM PC used 8088.
I think later low end IBM PC's used 8086.
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∙ 11y ago
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How many bits in 8088?
The Intel 8088 microprocessor was a variant of the Intel 8086 and was introduced on July 1, 1979. It had an 8-bit external data bus instead of the 16-bit bus of the 8086. The 16-bit registers and the one megabyte address range were unchanged, however. The original IBM PC was based on the 8088.
How is memory implementation for 8086 different from 8088?
The 8088 brings in data in 8 bit chunks form the memory and must bring in two because internally it is 16 bit. The 8086 brings in the full 16 bits at one time. so it is the path to memory that differs.
What is memory interfacing in 8086 microprocessor?
The 8086/8088 is a 16 bit computer running on a 20 bit address bus. Processes use a segmented memory architecture to access one of four 64kb memory segments from a physical space of 1mb.
Explain the real mode in 8086?
Real mode is a term that was introduced for the 80286 and higher processors. It represents the default (power on) mode of an 80286 or higher processor, as opposed to one of the various protected modes. Real mode does not apply specifically to the 8086/8088. In the 80286 and above, real mode operates very much like the 8086/8088.
What is the difference between the 8086 and the 8087?
The 8086 was a 16-bit microprocessor chip. It gave its name to the x86 architecture. It was the main CPU of the computer. The 8087 was the first math coprocessor for 16 bit processors. It was the first of the x87 architecture chips. it couldn't act as the main CPU in a computer, it was dedicated to doing floating point mathematical computations.
What is the difference between 8080 and 8086?
The major difference between the 8085 and the 8086/8088 is that the 8085 is an 8 bit computer, and the 8086/8088 is a 16 bit computer.
When does the overflow flag in 8086 set?
In the 8086/8088, the overflow flag is set when the result of an arithmetic instruction exceeds the bounds of the signed representation of a number. This is not the same as the carry flag, which is used for the unsigned representation. Both flags get set as needed. You decide which one to pay attention to.
What is parity interrupt?
There is no parity interrupt on the 8085 or 8086/8088. If you mean a memory parity interrupt, that is a function of system design, not a function of the particular microprocessor involved. Generally, a memory parity error is fatal, so one would typically place it on a non-maskable interrupt, such as TRAP on the 8085, or INT 2 (NMI) on the 8086/8088. This assumes, of course, that the memory parity error does not just crash the processor.
What is the working of 8087 NDP microprocessor?
The 8087 Numeric Data Processor is an adjunct to the 8086/8088 microprocessor, that gives the 8086/8088 floating point capability and 8 more registers. The 8087 integrates itself with the 8086/8088 in such a way that the pair actually becomes one processor, appearing to have the extra instructions and registers to start with.Since it was an optional add-on to the system, many run-time libraries would detect whether or not the 8087 was present, and either use it or emulate it.This separation of functionality into two chips was maintained in the product line up until the 80386DX and 80486, although the NDP was called something else (such as the 80287, and 80387) at which point the NDP became a permanent part of the instruction set.
What is the use of debug in 8086 microprocessor?
The debug flag in the 8086/8088 microprocessor causes one instruction to be executed, followed immediately by a debug interrupt. The flag then gets turned off, so you get get nested debug interrupts. This is used by a debugger program to single step a process that it is debugging (the debugee, so to speak).
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.
What is an ax register?
It is one of 4 registers called general purpose registers Ax has a another name witch is (accumulator) it used in arithmetic and logic operation and store data from I/o port in microprocessors like 8086/8088
