ACPI HOWTO files

Current (October 19, 2005, 0.2e): HTML format, text format, or XML (i.e. DocBook format)

Older versions:
October 13, 2005, 0.2d: HTML format, text format, or XML (i.e. DocBook format)
October 7, 2005, 0.2c: HTML format, text format, or XML (i.e. DocBook format)
September 30, 2005, 0.2b: HTML format, text format, or XML (i.e. DocBook format)
September 25, 2005, 0.2a: HTML format, text format, or XML (i.e. DocBook format)
September 13, 2005, 0.2: HTML format, text format, or XML (i.e. DocBook format)

From 2001 or earlier:
acpi_howto.txt.0.1e
acpi_howto.txt.0.1d
acpi_howto.txt.0.1c
acpi_howto.txt.0.1b