The most significant difference between the Intel 8085 and 8086 microprocessors is that the 8085 is an 8-bit system and the 8086 is a 16-bit system. This difference allows the 8086 system to have a much larger set of operational instructions and can make calculations to more significant places. Note: the 8085 processor does have two 16-bit registers. The pointer and the program counter.
Describe with block diagram interfacing of adc with 8086?Read more: Describe_with_block_diagram_interfacing_of_adc_with_8086
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The 80386 was a third generation version of the 8086/8088 microprocessor. The second generation was the 80286, adding protected mode. The 80386 added 32 bit mode, virtual 8086 mode, and flat 32 bit protected mode.The 80386 fixed the problem of the 80286 where existing object code was not compatible in protected mode because the meaning of the segment registers changed. The 80386 allowed the operating system to run in protected mode while presenting the process with a virtual 8086 environment where the segment registers worked as before. This was a stop-gap measure that worked until the full implementation of a true 32 bit flat memory model operating system and software.
minimum mode and maximum mode
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The 8086/8088 processor is a 16 bit processor. In a 16 bit two's complement notation, the maximum number is 0x7FFF, or 32767, while the minimum number is 0x8000, or -32768.
Its 16bit microprocessor,and-> the 8086 has a 16bit databus 20bit address bus-> the intel 8086,is designed to operate in two modes namely(1) minimum mode(2) maximum mode
that depends on the microcontroller. check the datasheet.
Its MRDC (memory read control) it is a maximum mode pin in 8086 microprocessor
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Comparision between motorola6800 And Intel 8086
In 8086 microprocessor the total memory addressing capability is 1 mega bytes. For representing 1 mb there are minimum 4 hex digits are required i.e, 20 bits. but 8086 has fourteen 16-bit registers. That is there are no registers for representing 20 bit address. So,the total memory is divided into 16 logical segments and each segment capacity is 64 kb(kilo bytes). That is 16*64kb=1 mb.So,for representing 64 kb only 16 bit register is sufficient.
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A minimum mode configuration is a 8086 system. It is operated in minimum mode by strapping its MN/MX pin to logic 1. Minimum mode has a single multiprocessor.
The two modes of the 8086/8088, minimum mode and maximum mode, have nothing to do with segment arrangement. The modes determine which pins on the chip have which functions. In minimum mode, certain pins are sacrificed in favor of a smaller implementation. In maximum mode, those pins take on other functions, and the original functions are generated by the Bus Controller chip.