PhoenixBIOS is a personal computer BIOS developed by Phoenix Technologies since 1983. It is the first IBM PC compatible BIOS to be legally licensed to other system vendors, and thus marks the beginning of competition between Phoenix and other commercial BIOS vendors who later developed their own solutions (such as American Megatrends with their AMIBIOS and Award Software with their AwardBIOS).
Prior to its introduction, vendors attempted to implement their own compatible solutions by copying portions of the IBM BIOS source code from reference manuals, which was illegal due to copyright infringement and usually resulted in legal action by IBM. Phoenix developed its solution using a method called the "Chinese Wall" to avoid copyright infringement. Using this method, one group of their engineers first read the reference manuals to reverse engineer the various functions of the BIOS, documenting how they worked without writing any actual code, and then passed those documents to another engineer who wrote his own code to mimic those functions. According to Phoenix's Vice President of Marketing, Lance Hansche, "He (the engineer) was a TI-9900 programmer" and that "The TI-9900 processor (Texas Instruments TMS9900) is stack oriented, it doesn't have registers like the (Intel) 8088" and also that "There's no way his code could be the same as IBM's, it took us 3 months of memos to convince him to use registers at all!"[1]. During this process, the audit trail of both groups' interactions was also recorded to prove the legality of their implementation. Since the engineers who wrote the BIOS never looked at the reference manuals, they could not have copied the IBM BIOS source code, so this implementation did not violate IBM's copyright and was therefore legal.
Today, especially since the early 2010s, it has been largely replaced by SecureCore, which is Phoenix's UEFI solution.
List of known versions
The following is a list of known versions of PhoenixBIOS.
| Main core version | Main core release date | POST screen | Notes |
|---|---|---|---|
| Phoenix ROM BIOS Ver 1.xx | 1984 | ||
| Phoenix ROM BIOS Ver 2.xx | 1986? | ||
| Phoenix ROM BIOS PLUS | 1987 | A code fork by Dell exists. Probably considered as PhoenixBIOS 3.xx by Phoenix. | |
| PhoenixBIOS 4.0x | 1988 | A code fork by Intel exists | |
| PhoenixBIOS Ax86 | 1990? | ||
| PhoenixBIOS 4.0 Release 6.x | 1997 | Labelled as PhoenixBIOS 4.06 by Fujitsu-Siemens. Also used by VMware. A code fork by Intel also exists. | |
| Phoenix ServerBIOS 1 | 1997 | ||
| Phoenix ServerBIOS 2 | 2000 | ||
| Phoenix ServerBIOS 3 | 2001 | ||
| Phoenix ServerBIOS 3.5 Grid Edition | 2002 | Referred to in a news article. Possibly an AMD-only special release. |