Intel 8088
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| Intel 8088 Central processing unit |
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 An Intel 8088 microprocessor |
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| Produced: | From 1979 to 1990s |
| Manufacturer: | Intel |
| Max CPU clock: | 5 MHz to 10 MHz |
| Instruction set: | x86-16 |
| Package: | 40 pin DIP |
The Intel 8088 is an Intel microprocessor based on the 8086, with 16-bit registers and an 8-bit external data bus. It can address up to 1 MB of memory. The 8088 was introduced on July 1, 1979, and was used in the original IBM PC.
The 8088 was targeted at economical systems by allowing the use of 8-bit designs. Large bus width circuit boards were still fairly expensive when it was released. The prefetch queue of the 8088 is four bytes, as opposed to the 8086's six bytes.
Variants of the 8088 with more than 5MHz maximum clock frequency, include the 8088-1 in HMOS and the 80C88-2 in CMOS, which both were specified for 10 MHz maximum frequency.
The descendants of the 8088 include the 80188, 80186, 80286, 80386, and 80486 microprocessors which are still in use today. See the list below for a more complete list.
The most influential microcomputer to use the 8088 was, by far, the IBM PC. The original PC processor ran at a clock frequency of 4.77 MHz (4/3 the NTSC colorburst frequency of 3.579545 MHz). Depending on the model, the Intel 8088 ranged from 0.33 to 0.75 million instructions per second. [1]
IBM's own engineers wanted to use the Motorola 68000, and it was used later in the IBM Instruments 9000 Laboratory Computer, but IBM already had rights to manufacture the 8086 family, in exchange for giving Intel the rights to its bubble memory designs. A factor for using the 8-bit Intel 8088 version was that it could use existing Intel 8085-type components, and allowed the computer to be based on a modified 8085 design. 68000 components were not widely available at the time, though it could use Motorola 6800 components to an extent. Intel bubble memory was on the market for a while, but Intel left the market due to fierce competition from Japanese corporations who could undercut by cost, and left the memory market to focus on processors.
A pin compatible replacement chip, the V20, was produced by NEC for an approximate 20 percent improvement in computing power.
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