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DMA Hardware (8237 DMAC) :
1)Processor contain HOLD/HOLD Acknowledge lines to interact with 8237
o DMAC can achieve control of ISA bus by asserting HOLD
o Processor acknowledges with HLDA
2)DRQ4 services slave controller Priorities are set as fixed
o DRQ0 highest and DRQ7 lowest
o It set at POST
o It can be reprogrammed for rotating priority
3)ISA address/data/control lines are also linked (not shown)
o It can access control registers through ports
o Each channel has a page register associated with
I was wondering if you guys could offer me some advice and help on how to proceed - not answers- for a homework problem I am attempting. I am currently working on a "bomb" project
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8251 Programmable/Communication Interface As an instance of a serial interface device let us suppose Intel's 8251 A programmable communication interfaces. The 8251A is diagram
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