After 5 years the IEEE 1275-1994 standard got withdrawn by the IEEE Standards Association. This does by no means implicate that this standard is abandoned or dead. There are several commercial implementations of Open Firmware and a quite reasonable number of hardware vendors support it. IEEE sold it to Global Engineering who still offer it.
To Contact Global Engineering, use Phone: 1-800-854-7179, Fax: 303-397-2740. Out side the U.S. call 303-792-2181. You can also purchase the IEEE 1275-1994 document online from the Global Engineering website.
To get started with OpenBIOS, download the IEEE 1275-1994, Standard for Boot (Initialization Configuration) Firmware Core Requirements and Practices. You can get the document from our local mirror or from the IEEE 1275-1994 ftp archive at sun.com.
For more information on IEEE 1275 Open Firmware, we recommend you browse the IEEE Standard 1275 Working Group's Home Page. There you will find general information and official minutes of the Working Group.