1996? I doubt that. Probably 1997 or 1998 for you.
ACPI only got released in December 1996, and the first PCs with ACPI sold in 1997.
Widespread adoption was only in 1998/99.
Windows 95 had no ACPI support, Win 98 came with disabled ACPI. Only Linux 2.6 and Windows 2000 and onwards supported ACPI. And those OS even disabled ACPI on pre-2000 hardware, as ACPI v1 was quite buggy.
https://en.wikipedia.org/wiki/Advanced_Configuration_and_Power_Interface
Biting the hand that feeds IT
