Problem:
Question 1: Describe effect on the microprocessor and DMA controller when the HOLD and HLDA pins are at their logic 0 levels.
Question 2: Write a sequence of instructions that transfers data from memory to an external I/O device by using Channel 3 of the 8237. The memory area to be transferred is at location 20000H-20FFFH.
Any help would be greatly appreciated!