transparently recompiled applications for the new processor architecture. The port of OS/400 to the PowerPC AS architecture required a rewrite of most of the code below the TIMI due to the use of IMPI microcode to implement significant quantities of the operating system's low level code. This led to the creation of the System Licensed Internal Code (SLIC) - a new implementation of the lower levels of the operating system mostly written in C++. Rebranding The AS/400 family line was rebranded several times in the 1990s and 2000s as IBM introduced newer generations of hardware and operating system. In 1994, the AS/400 Advanced Series name was used for new models, followed by the rebranding of the product line to AS/400e (the e standing for e-business) in 1997. In 2000, eServer iSeries was introduced as part of its eServer branding initiative. The eServer iSeries was built on the POWER4 processor from the RS64 processors used by previous generations, meaning that the same processors were used in both the iSeries and pSeries platforms, the latter of which ran AIX. Successive generations of iSeries and pSeries hardware converged until they were essentially the same hardware sold under different names and with different operating systems. In 2004, eServer i5 (along with OS/400 becoming i5/OS) the 5 signifying the use of POWER5 processors, was introduced, replacing the eServer iSeries brand.. The final rebranding occurred in 2006, when IBM rebranded the eServer i5 to System i. In April 2008, IBM introduced the IBM Power Systems line, which was a convergence of System i and System p product lines. The first Power Systems machines used the POWER6 processors; i5/OS was renamed as IBM i, in order to remove the association with POWER5 processors. IBM i is sold as one of the operating system options for Power Systems (along with AIX and Linux) instead of being tied to its own hardware platform. Legacy Although announced in 1988, the AS/400 remains IBM's most recent major architectural shift that was developed wholly internally. Since the arrival of Lou Gerstner in 1993, IBM has viewed such major internal developments as too risky. Instead, IBM now prefers to make key product strides through acquisition (e.g., the takeovers of Lotus Software and Rational Software) and to support the development of open standards, particularly Linux. After the departure of CEO John Akers in 1993, when IBM looked likely to be split up, Bill Gates