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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
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Convert 751 to hex and show what it would look like stored at TheNumber WORD ? (hint: answer in hex pairs)
what is the hex value in ax after executing the instructions ax= 1E8A bx=4080 add al,bl sub ah,bh
how to find out the given number is positive or negative?
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