Consider a dram that must be given a refresh cycle 64 times perms. each refresh operation requires150 ns; a memory cycle requires250 ns. what percentage of the memory's total operating time must begiven to refreshes?

Give an example of a case where a two-way handshake to establish a connection could leave one side of the connection live while the other side does not believe there is a connection.

Write a program that defines symbolic names for several string literals (chars between quotes). * use each symbolic name in a variable definition. * use of symbolic to compose the assembly code instruction set can perform vara = (vara - varb) + (varc - vard); ensure that variable is in unsigned integer data type. * you should also further enhance your symbolic logic block to to perform expression by introducing addition substitution rule. vara = (vara+varb) - (varc+vard). required: debug the disassembly code and note down the address and memory information.

Which one of the following is considered a peripheral? a software b mouse c usb connector d motherboard