Explain the signals HOLD, READY and SID

Explain the signals HOLD, READY and SID
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Answer :

HOLD  indicates  that  a  peripheral  such  as  DMA  controller  is  requesting  the  use  of  address  bus,  data  bus  and  control  bus.  READY  is  used  to  delay  the  microprocessor read or write cycles until a slow responding peripheral is ready to  send or accept data. SID is used to accept serial data bit by bit
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