"It is possible to make it appear that memory is organized in little-endian format, even though it is maintained by a microprocessor that is inherently big-endian, such as the PowerPC processor. This effect is desirable, for example, when Windows NT runs on a PCI-based Power Macintosh computer, because Windows NT requires memory to appear to be little-endian."
Apple documentation : Designing PCI Cards and Drivers for Power Macintosh Computers, Revised Edition (1999-03-26), "Address Swizzling" in Appendix A.
powerpc NT was dead for two years by this point???
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