Explain multiple LSI's are used in computers list out some of their special purposes?

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Some of the purposes for which the LSI are used are as follows:

★ PIC or the programmable interrupt controller.
★ PIT or the programmable interrupt timer.
★ PPI or programmable peripheral interface.
★ CRTC is used for the controlling of the CRT.
★ The floppy disk, hard disk and DMA controller are used for special purposes.
★ The real time calendar or clock is used to organize and sort out things.
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