Major Innovation: LSIC and VLSIC (Micro Processor)
Main Memory: EPROM and SRAM.
External Storage: Floppy Disk and Hard Disk.
Input and Output Devices: Monitor for output.
Languages: Languages and application software.
Operating System: MS-DOS and PC-DOS
Micro computer e.g. IBM-PC, Apple Macintosh-etc. The Integrated circuits were more developed and called Small scale integration (551), after some time the SSI were more developed and termed as large scale integration (LSI). There was a great versatility of input-output devices. In 1971, a powerful microprocessor chip INTEL 8008 was introduced. The first microprocessor which is used in personal computers (PC) was INTEL 8080.
was also introduced in 1971, while hard disk was introduced in 1973. The 5.25 Floppy disk was first time used in 1978. The optical disk was developed in 1980. First portable computer “Osborne I” was marketed in 1981. IBM-3033, IBM-370, IBM system 34, IBM system 36, Cray-I, CP/M etc were introduced in this generation.
Advantages of Fourth Generation:
Smaller in size and much reliable.
No cooling system required in many cases.
Much faster computation.
Portable and cheap.
The heat generated was negligible.
Totally general purpose computer.
Disadvantages of Fourth Generation:
The very advanced technology was required to fabricate to the ICs.