Processors can number the bytes within a word to make the byte with
the lowest number either the leftmost or rightmost one. The convention
used by a machine is its byte order. MIPS processors can
operate with either big-endian byte order:
or little-endian byte order:
SPIM operates with both byte orders. SPIM's byte order is determined
by the byte order of the underlying hardware running the simulator.
On a DECstation 3100, SPIM is little-endian, while on a HP Bobcat, Sun
4 or PC/RT, SPIM is big-endian.