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4.3. Further programming
A subsection of Computer Science, 9608, through 4. Further Problem-solving and Programming Skills
Listing 3 of 3 questions
Five modes of addressing and five descriptions are shown below. Draw a line to connect each mode of addressing to its correct description. Mode of addressing Description direct the operand is the address of the address of the value to be used immediate the operand is the address of the value to be used indexed the operand is the offset from the current address where the value to be used is stored indirect the operand plus the contents of the index register is the address of the value to be used relative the operand is the value to be used
9608_s15_qp_11
THEORY
2015
Paper 1, Variant 1
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Five modes of addressing and five descriptions are shown below. Draw a line to connect each mode of addressing to its correct description. Mode of addressing Description direct the operand is the address of the address of the value to be used immediate the operand is the address of the value to be used indexed the operand is the offset from the current address where the value to be used is stored indirect the operand plus the contents of the index register is the address of the value to be used relative the operand is the value to be used
9608_s15_qp_12
THEORY
2015
Paper 1, Variant 2
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When an application program requests a file stored on a hard disk, the computer system reads the file. Use the statement labels A to H to complete the sequence of steps that describe how this happens. Label Statement A When the hard disk drive has read the file, it generates an interrupt. B While the file continues, the head reads successive clusters of sectors from the disk and writes data into the disk buffer. C The head reads the first cluster of sectors from disk and writes data into the disk buffer. D The head moves to the correct track. E The operating system transfers the contents of the disk buffer to the application program’s data memory. F In the relevant directory file, the operating system looks up the track and sector where the file begins. G Application program passes file read request to the operating system. H The hard disk drive waits for the correct sector to arrive under the head. 1. The application program executes a statement to read a file. 2. 3. The operating system begins to spin the hard disk, if it is not currently spinning. 4. 5. 6. 7. 8. 9. 10.
9608_w16_qp_12
THEORY
2016
Paper 1, Variant 2
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Questions Discovered
3