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If a file starts with the signature MM it means that integers are represented as big-endian, while II means little-endian. Those signatures need a single 16-bit word each, and they are palindromes, so they are endianness independent. I stands for Intel and M stands for Motorola. Intel CPUs are little-endian, while Motorola 680x0 CPUs are big ...
An architecture may use "big" or "little" endianness, or both, or be configurable to use either. Little-endian processors order bytes in memory with the least significant byte of a multi-byte value in the lowest-numbered memory location. Big-endian architectures instead arrange bytes with the most significant byte at the lowest-numbered address.
Below is the full 8086/8088 instruction set of Intel (81 instructions total). [2] ... Usually used to convert between big-endian and little-endian data ...
BER: variable-length big-endian binary representation (up to 2 2 1024 bits); PER Unaligned: a fixed number of bits if the integer type has a finite range; a variable number of bits otherwise; PER Aligned: a fixed number of bits if the integer type has a finite range and the size of the range is less than 65536; a variable number of octets ...
TIFF files begin with either "II" or "MM" followed by 42 as a two-byte integer in little or big endian byte ordering. "II" is for Intel, which uses little endian byte ordering, so the magic number is 49 49 2A 00. "MM" is for Motorola, which uses big endian byte ordering, so the magic number is 4D 4D 00 2A. Unicode text files encoded in UTF-16 ...
IA-64 (Intel Itanium architecture) is the instruction set architecture (ISA) of the discontinued Itanium family of 64-bit Intel microprocessors.The basic ISA specification originated at Hewlett-Packard (HP), and was subsequently implemented by Intel in collaboration with HP.
Header size in little endian ... Only Intel and Apple silicon Mac computers can boot from GPT. ... 32‐bit MIPS big‐endian [49]
According to the Intel specification the data must be in little-endian order. So the data would only be in big-endian (or other order) if an implementation has not followed the spec for some reason, which is sadly all too common. Non-standard behaviour should be specified in documentation for the particular tool, if at all.