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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
write and run a programme using 8086 assembly language that interchange the lower four bits of AL registered with upper four bits.
PLEASE MAY YOU ASSIST ME WITH SAMPLE CODES FOR PROGRAMING A FIRE ALARM MINI PROJECT
NOT : Logical Invert: The NOT instruction complements (inverts) the contents of an a memory location or operand register bit by bit. The instance are as following: Example :
DEC: Decrement :- The decrement instruction subtracts 1 from the contents of the particular memory location or register. All the conditions code flags except carry flag are affec
AAA: ASCII Adjust after Addition operation the AAA instruction is executed after an ADD instruction that adds 2 ASCII coded operands to give a byte of outcome in the AL. The AAA i
LABEL : The Label directive which is used to assign a name to the current content of the location counter. At the beginning of the assembly process, the assembler start a loca
String Manipulation Instruction A series of words or data bytes are available in memory at consecutive locations, to be mention to individually or collectively, are known as by
Convert 751 to hex and show what it would look like stored at TheNumber WORD ? (hint: answer in hex pairs)
Hello
do you type assembly code or machine code instructions like b8 0100000 to add to register EAX straigt onto dos command line or do you have to same in a file and what extension woul
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