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DMA controller :
Steps include in transferring a block of data from I/O devices (for example a disk) to memory:
1. CPU sends a signal to initiate disk transfer through I/O interface
2. CPU sends starting address of the block
3. Disk driver reads starting address, and then reads one block of data and puts it in its own buffer
4. Disk driver sends interrupt signal to the CUP
5. CPU reads the datum into its registers (accumulator)
6. CPU examine if there is more to transfer, if answer is yes, the CPU signals the disk driver to do so meanwhile
7. CPU transfer the datum from registers to memory and increments its pointer to memory
8. DMA controller takes care of the last few steps (from signalling disk to transfer) .
Write an assembly language program to perform a rot13 1 conversion on characters in a text file. The program should read charatcers from the input file, perform the rot13 convers
IMUL: Signed Multiplication: This instruction multiplies a signed byte by a signed bit in source operand e in the register AL or signed word in source operand by signed word in th
Write a program to evaluate the following expression. You are to evaluate the following equation: num1 - (input + num2) - (num3 + num4) Input will be a hex number input by
Physical Memory Mapped I/O and Port I/O : CPU controlled I/O comes in 2 ways. Simply the difference is whether we utilize the normal memory addresses for I/O, this is mention
this is my first project i dont know where to start
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
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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
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