Question

State dma controller signals of 8086

Answer 1

Answer:

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Answer 2

DMA controller signals of 8086:

• The direct memory access DMA interface of the 8086 minimum mode consists of the HOLD and HLDA signals.
• When an external device wants to take control of the system bus, it signals to the 8086 by switching HOLD to the logic 1 level.
• In the HOLD state, the signal lines AD0 through AD15, A16/S3 through A19/S6, BHE, M/IO, RD, WR, DEN are all in the high Z state.
• The 8086 signals external device by switching its HLDA output logic to 1 level.