CS609-Midterm
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To distinguish 486 with Pentium CPUID Test is used.
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Interrupt _____ is empty; we can use its vector as a flag.
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There are two main types of interrupts, namely
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In ____________each byte is needed to be encapsulated in start and end.
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An I/O device cannot be directly connected to the busses so controller is placed between CPU and I/O.
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The ____________ function simply enables the self test facility within the modem control register
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Interrupt ______ is used to get or set the time.
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In self test mode the output of the UART is routed to its input
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------------ is used to read time from RTC
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LPTs can be swapped.
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To set the interrupt vector means is to change the double word sized interrupt vector within the IVT.
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Control information in files is maintained using
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Display device (Monitor) performs _________ I/O.
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By cascading two DMAs ____ bits can be transferred.
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Int 14H __________ can be used to set the line parameter of the UART or COM port.
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If CPUID instruction is not present then the processor can be a
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The bit number _______ of the coprocessor control word is the interrupt enable flag.
18 / 50
Timer interrupt is a _________.
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Only ________ ports are important from programming point of view.
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21 / 50
What will be the value of DL register when we are accessing C drive using undocumented service 21H/32H?
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In counter register bit no. 3 changes its value between 0 and 1 with in ____clock cycles
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Following is not a method of I/O
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A software interrupt does not require EOI (End of interrupt).
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At IRQ 7 Interrupt # ___ is used.
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------------ is used to set time from RTC
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Maximum number of interrupts in a standard PC is
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Which port is known as Data Port______
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___________ is used to identify cause of interrupt.
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Usually interrupt procedures are reentrant procedures especially those interrupt procedure compiled using C language compiler are reentrant.
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BIOS support _____________UARTS as COM ports.
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------------ whenever receive indicates the start of communication ……….. whenever receive indicates the end of communication
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The following command “outportb (0x61,inportb(0x61) & 0xFC);” will
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File system used in CD’s is_______ file system
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The________ function uses the COM port number to receive a byte from the COM port using BIOS services.
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_________ is used to identify the cause of interrupt.
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______ is Disk interrupt.
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The microprocessor package has many signals for data. Below are some in Correct priority order (Higher to Lower).
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The ________function initialize the COM port whose number is passed as parameter using BIOS services.
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DCE is _____________
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_____ bit is cleared to indicate the low nibble is being sent.
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The -------- function receive a byte and COM port number is passed as parameter using BIOS service
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Int 14H______ can be used to set the line parameter of the UART or COM port
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The keyboard makes use of interrupt number _______ for its input operations.
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BIOS DO NOT support ______.
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49 / 50
_________ used to determine the amount of conventional memory interfaced with the processor in kilobytes.
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Standard PC operates in two modes in terms of memory which are
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