- The 32-bit 80486 is the next evolutionary step up from the 80386.
- One of the most obvious feature included in 80486 is a built-in math coprocessor. This coprocessor is essentially the same as the 80387 processor used with a 80386, but being integrated on the chip allows it to execute math instructions about three times as fast as a 80386/387 combination.
- 80486 is an 8Kbyte code and data cache.
- To make room for the additional signals, the 80486 is packaged in a 168 pin, pin grid array package instead of the 132 pin PGA used for the 80386.
- Operates on 25MHz, 33 MHz, 50 MHz, 60 MHz, 66 MHz or 100MHz.
- It consists of parity generator/checker unit in order to implement parity detection and generation for memory reads and writes.
- Supports burst memory reads and writes to implement fast cache fills.
- Three mode of operation: real, protected and virtual 8086 mode.
- The 80486 microprocessor is a highly integrated device, containing well over 1.2 million transistors.
New feature found in the 80486 are as follows:
- BIST (built-in self-test) that tests the microprocessor
- 8KB Code and data cache
- On-chip FPU(Floating Point Unit)
