5 Disk, seek time, latency, sector, request

Single-platter disk rotation speed: 7200 rpm number of tracks on one side of platter: 30,000 number of sectors per track: 600 seek time: 1 ms for every 100 tracks traversed Disk receives a request to access a random sector on a random track. assume the head starts at track 0. a. What is the average seek time? b. ave. rotational latency? c. transfer time for a sector? d. total ave. time to satisfy a request?

How many ports can the Intel 8088 microprocessor address in it's two I/O addressing modes?

In Intel 8088, two instruction formats are used to specify the I/O port address. How many ports can the 8088 address in each I/O addressing mode?

Indirect Port Addressing (ref 2)

Zilog Z8000 microprocessor family direct port addressing capability 16 bit port address is part of the instruction indirect port addressing capability referencing one of the 16-bit general purpose registers, which contains the port address. How many ports can the Z8000 address in each I/O addressing mode? 1? 2^16? 32768?

Compute the time taken by an 8-MHz processor to get the status and service the I/O device.

Timer alerts processor for a status scan of I/O device every 20 ms. I/O device interface has two 8-bit ports: status and data output. Compute the time it takes to get the status and service the device, with an 8-MHz processor clock rate. All instructions take 12 clock cycles. State your assumptions, if any.

Compute the processor savings in given situation, when using interrupt driven I/O instead of polled I/O.

In an 8-hour interval, an operator controls systems with 60 commands on the average, entered through a keyboard. a. Processor scans keyboard every 100 ms. Give check counts in an 8 hours period. b. If processor uses interrupt-driven I/O, how much does the processor save in fraction of its visits to the keyboard?