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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
DW : Define Word:- The DW directive serves the same purposes as the DB directive, but now it makes the assembler which reserves thenumber ofmemory words (16-bit) instead of by
* * * * **** * * * * * How can i print this help me pls
RICS/CISC Architecture An essential aspect of computer architecture is the design of the instruction set for the processor. The instruction set selected for a specific compute
check the al-register for palindromic number
Write an assembly program that will compute and output tuition cost: a. accept keyboard input of the number of credit hours taken b. accept keyboard input of the type of classes 1
TEST : Logical Compare Instruction: The TEST instruction performs bit by bit logical AND operation on the 2 operands. Each bit of the result is then set to value I, if the equival
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
a pseudo-code to add username and password combination up to a limit of 10
Interrupt When the CPU detects an interrupt signal, it stops activity of current and jumps to a special routine, known an interrupt handler. This handler then detects why the i
write shell to calculate basic salary from given .
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