What is the difference between 8080 and 8086?

Answer 1

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.

Answer 2

• 8008 is an 8 bit microprocessor chip designed by Intel. It first came out in 1972. Intel's first 8 bit microprocessor. Maximum memory 16K bytes.
• 8080 is an 8 bit microprocessor chip designed by Intel. It first came out in 1974. While the instruction set was designed as an expanded version incorporating all of the original 8008 instructions, the opcodes and instruction formats are completely incompatible to make room in the code for the many new instructions. Maximum memory 64K bytes.
• 8085 is an 8 bit microprocessor chip designed by Intel. It first came out in 1977. It uses the same instruction set as the even older Intel 8080, with a tiny extension of about half a dozen new instructions. Maximum memory 64K bytes.
• 8086 is a 16 bit microprocessor chip designed by Intel. It first came out in 1978. While the instruction set was designed as a 16 bit expanded version incorporating all of the original 8080 instructions, the opcodes and instruction formats are completely incompatible. The 8086 instruction set does not include equivalents for the new instructions the were added in the 8085. The first of the x86 architecture family. Maximum memory 1 megabytes, accessed in segments of 64K bytes.

Note: it was considered at the time by Intel that every new microprocessor must include direct equivalent instructions of its predecessor even if the instructions were remapped and no longer binary compatible, because while some software companies were using compilers (e.g. Intel's PL/M) many insisted on using only assemblers. Intel would facilitate the transition period by supplying a special program that read assembly source code for the older microprocessor and write assembly source code for the new microprocessor. This only worked because each instruction had a one for one equivalent, even though the assembly mnemonics and syntax were different and the binary machine code was different. After the x86 architecture was created by the 8086 this was discontinued, as the instruction set was never again remapped only extended while maintaining full binary compatibility with the older instruction set core.

Answer 3

The 8086 and 8088 are the same processor, a 16 bit processor, with the same instruction set, registers, and architecture. The 8086, however, runs on a 16 bit bus, while the 8088 runs on an 8 bit bus. As a result, the 8086 is capable of fetching and storing two bytes per bus transaction while the 8088 can only do one byte. In this aspect, the 8086 is twice as fast as the 8088, buswise, at the cost of greater bus complexity, but that depends on the instruction mix, as total performance could be limited by processor time as well.

Answer 4

The major differences between the 8085 and 8086/8088 are...

• The 8085 is an 8 bit computer while the 8086/8088 is a 16 bit computer.
• The 8085 has a 16 bit address bus while the 8086/8088 has a 20 bit address bus.
• The 8086/8088 has many more instructions, such as divide and multiply.
• The 8086/8088 has capability of being teamed up with a floating point co-processor, the 8087.
• The 8086/8088 has repeatable string primative instructions.
• The 8086 has a 16 bit external bus while the 8085 and 8088 have an 8 bit external bus.
• The 8086/8088 uses a segmented architecture, allowing paragraph level relocation.
• Any many more...

Answer 5

http://www.csus.edu/indiv/b/benveniste/lecture1/tsld012.htm go here and read all about it

Answer 6

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.