Chapter 13

Question 1

Define

Integer

Data type

Answer 1

A signed binary value contained in a byte, word, or doubleword, using twos complement representation.

Question 2

Define

Ordinal

data type

Answer 2

An unsigned integer contained in a byte, word, or doubleword.

Question 3

Define

Unpacked binary coded decimal (BCD)

data type

Answer 3

A representation of a BCD digit in the range 0 through 9, with one digit in
each byte.

Question 4

Define

Packed BCD

Answer 4

Packed byte representation of two BCD digits; value in the range 0 to 99

Question 5

Define

Near Pointer

Answer 5

A 16-bit, 32-bit, or 64-bit effective address that represents the offset within a segment. Used for all pointers in a nonsegmented memory and for references within a segment in a segmented memory.

Question 6

Define

Far pointer

data type

Answer 6

A logical address consisting of a 16-bit segment selector and an offset of 16, 32, or 64 bits. Far pointers are used for memory references in a segmented memory model where the identity of a segment being accessed must be specified explicitly

Question 7

Define

Bit field

data type

Answer 7

A contiguous sequence of bits in which the position of each bit is considered as an independent unit. A bit string can begin at any bit position of any byte and can contain up to 32 bits

Question 8

Define

Bit string

data type

Answer 8

A contiguous sequence of bits, containing from zero to 2^23 – 1 bits.

Question 9

Define

Byte string

data type

Answer 9

A contiguous sequence of bytes, words, or doublewords, containing from zero to 2^23 – 1 bytes

Question 10

Define

Single instruction multiple data (SIMD)

data types

Answer 10

Introduced to the x86 architecture as part of the
extensions of the instruction set to optimize performance of multimedia applications
* These extensions include MMX (multimedia extensions) and SSE (streaming SIMD extensions)
* Data types:
– Packed byte and packed byte integer
– Packed word and packed word integer
– Packed doubleword and packed doubleword integer
– Packed quadword and packed quadword integer
– Packed single-precision floating-point and packed double-precision floating-point

Question 11

Define

Packed SIMD (single
instruction, multiple data)

data type

Answer 11

Packed 64-bit and 128-bit data types.