evolution of microprocessors

                                                   Evolution of microprocessors

Microprocessors	Number of transistor	Initial clock speed	Address bus	Data bus	Addressing memory
4004	2300	108 KHz	10 bit	4 bit	640 bytes
8008	3500	200 KHz	14 bit	8 bit	16 kb
8080	6000	2 MHz	16  bit	8 bit	64 kb
8085	6500	5 MHz	16 bit	8 bit	64 KB
8086	29000	5 MHz	20 bit	16 bit	1 MB
8088	29000	5 MHz	20 bit	8 bit	1 MB
80286	134000	8 MHz	24 bit	16 bit	16 MB
80386	275000	16 MHz	32 bit	32 bit	4 GB
80486	1.2M	25 MHz	32 bit	32 bit	4 GB
Pentium	3.1M	60 MHz	32 bit	32/64 bit	4 GB