Question: A system has two disk drives connected to one disk controller, a line printer connected to a parallel port, and 10 terminals connected to 10

  1. A system has two disk drives connected to one disk controller, a line printer connected to a parallel port, and 10 terminals connected to 10 serial limes controlled by a single controller. The disk controller can issue a command to one disk while another disk is processing a command, but it may have only one disk transferring I/O at a time. The serial controller can handles simultaneous I/O from all its connected devices. All the controllers use DMA. The transfer rates for the devices are: disk device, 1000Kb/s; printer, 1 Kb/s; and terminal, 5 Kb/s. What is the maximum I/O transfer rate for this system?

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