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Explain the signals HOLD, READY and SID
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 unless a slow responding peripheral is ready to send or accept data. SID is used to accept serial data bit by bit
What is meant by polling? Polling or device polling is a process which recognizes the device that has interrupted the microprocessor.
What are the modes of operations used in 8253? Each of the three counters of 8253 can be operated in one of the following six modes of operation. 1. Mode 0 (Interrupt on ter
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You have to look up the data sheets for the LM317 (Not LT317), LT1006. V1 is a standard 9 volt battery, and the resistors are “through hole”. Label the test points in, V+, gnd, and
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