Unit-2 (INTERFACING AND I/O DEVICES) Hand Written Notes

Need for Interfacing - /Memory Interfacing: address space partitioning – address map – Address
decoding – Designing decoders circuit for the given address map – Bus contention and 2 – line
Control – Access Time Computations.
I/O Interfacing: Data transfer schemes – programmed Synchronous and asynchronous –
Interrupt driven Transfer – Multiple devices and multiple interrupt levels – enabling disabiling
and masking of interrupts.
DMA transfer: Cycle stealing – Burst mode – Multiple DMA devices – DMA transfer in 8085
system – serial data transfer.

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