Comparison Between 8086 And 80286

Comparison of 8086 and 80286

Comparison between 8085, 8086, 80286, 80386, 80486, Pentium. The 80486 architecture has been ungraded such that half of its instructions are executed in 1 clock cycle instead of two clock cycles. It has 80386 like microprocessor and 80387 like numeric coprocessor. Following table compares 80286 vs 80386 vs 80486 and mentions difference between them.

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Comparison between 8085 and 8086

Basic Difference Between 8086 And 80286

  1. Comparison between 8085, 8086, 80286, 80386, 80486, Pentium.
  2. This page on 8086 vs 80286 vs 80386 vs 80486 describes difference between 8086, 80286, 80386 and 80486. 8086 is the microprocessor released after 8085 microprocessor from Intel. Refer 8085 vs 8086 for comparison between the two. 8086 Microprocessor.

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Prev: 13.2 Two ways to Execute 80286 Tasks
Next: Chapter 14 80386 Real-Address Mode

13.3 Differences From 80286

The few differences that do exist primarily affect operating system code.

13.3.1 Wraparound of 80286 24-Bit Physical Address Space

With the 80286, any base and offset combination that addresses beyond 16Mbytes wraps around to the first megabyte of the 80286 address space. Withthe 80386, since it has a greater physical address space, any such addressfalls into the 17th megabyte. In the unlikely event that any softwaredepends on this anomaly, the same effect can be simulated on the 80386 byusing paging to map the first 64K bytes of the 17th megabyte of logicaladdresses to physical addresses in the first megabyte.


13.3.2 Reserved Word of Descriptor

Comparison of 8086 and 80286

Because the 80386 uses the contents of the reserved word (last word) ofevery descriptor, 80286 programs that place values in this word may notexecute correctly on the 80386.

13.3.3 New Descriptor Type Codes

Operating-system code that manages space in descriptor tables often uses aninvalid value in the access-rights field of descriptor-table entries toidentify unused entries. Access rights values of 80H and 00H remain invalidfor both the 80286 and 80386. Other values that were invalid on for the80286 may be valid for the 80386 because of the additional descriptor typesdefined by the 80386.

13.3.4 Restricted Semantics of LOCK

Comparison Of 8086 And 80286

The 80286 processor implements the bus lock function differently than the80386. Programs that use forms of memory locking specific to the 80286 maynot execute properly when transported to a specific application of the80386.

The LOCK prefix and its corresponding output signal should only be used toprevent other bus masters from interrupting a data movement operation. LOCKmay only be used with the following 80386 instructions when they modifymemory. An undefined-opcode exception results from using LOCK before anyother instruction.

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A locked instruction is guaranteed to lock only the area of memory definedby the destination operand, but may lock a larger memory area. For example,typical 8086 and 80286 configurations lock the entire physical memory space.With the 80386, the defined area of memory is guaranteed to be lockedagainst access by a processor executing a locked instruction on exactly thesame memory area, i.e., an operand with identical starting address andidentical length.

13.3.5 Additional Exceptions

The 80386 defines new exceptions that can occur even in systems designedfor the 80286.

  • Exception #6 — invalid opcode
    This exception can result from improper use of the LOCK instruction.
  • Exception #14 — page fault
    This exception may occur in an 80286 program if the operating system enables paging. Paging can be used in a system with 80286 tasks as long as all tasks use the same page directory. Because there is no place in an 80286 TSS to store the PDBR, switching to an 80286 task does not change the value of PDBR. Tasks ported from the 80286 should be given 80386 TSSs so they can take full advantage of paging.

Comparison Between 8085 And 8086

Comparison Between 8086 And 80286Prev: 13.2 Two ways to Execute 80286 Tasks
Next: Chapter 14 80386 Real-Address Mode

1. The 8086 microprocessor is available with clock frequency of 5, 8 and 10 megahertz. Microprocessor Notes‎ > ‎ 3. Now the question arises what are the factors that make 80286 more advantageous than 8086 microprocessor? them one by one. Following table compares 80286 vs 80386 vs 80486 and mentions difference between them. It has non-multiplexed address and data bus that reduces operational speed. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. 8085 architecture instructions.

80386 Architectute. This page on 8086 vs 80286 vs 80386 vs 80486 describes difference between 8086, 80286, 80386 and 80486. The bus unit also contains a bus control module that controls the prefetcher module. Execution Unit (EU), The address unit is responsible for calculating the physical address of instructions and data that the CPU wants to access. Also the address lines derived by this unit may be used to address different peripherals. No notes for slide. 0000049761 00000 n Deux processeurs Intel 80286 cadencés à 6, 80286 High Performance Microprocessor with Memory Management and Protection, Portail de l’électricité et de l’électronique,, Article contenant un appel à traduction en anglais, Portail:Électricité et électronique/Articles liés, licence Creative Commons attribution, partage dans les mêmes conditions, comment citer les auteurs et mentionner la licence, Le mode d’adressage dit réel, dans lequel il se comportait comme un 8086 amélioré et pouvait exécuter les programmes et les. The EU contains the register bank used for storing the data as scratch pad, or used as special purpose registers. This mode of 80286 offers memory addressability of 16 MB of physical memory along with 1 GB of virtual memory.

Further in 1985, Intel produced upgraded version of 80286 which was a 32-bit microprocessor. 2 2102440 Introduction to Microprocessors 3 80286 Microprocessor ¾Announced in 1982, the 5th of i86 Family ¾125k transistors, HMOS III technology ¾Two mode of operations zReal mode – operates as fast 8086/8088 zProtected mode – enhances memory management, multitasking and protection ¾Improves both hardware and software zAdditional pipeline, demultiplexed address and data The second generation of x86 16-bit processors, Intel 80286, was released in 1982. The fetching of data through the memory is done through the data bus.

The main component of EU is ALU i.e., arithmetic and logic unit that performs the arithmetic and logic operations over the operand according to the decoded instruction. Address Unit (AU) These prefetched instructions are arranged in a 6-byte instructions queue.

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