This was the original design feature of the System/38 (S/38) in the mid 1970s planning for future use of faster processors, memory and an expanded address space.
Much of the software necessary to run the IBM System i is included and integrated into the base operating system. The IBM System i also supports common client–server systems such as ODBC and JDBC for accessing its database from client software such as Java, Microsoft .NET languages and others. ==History== The IBM System i, then known as the AS/400, was the continuation of the System/38 database machine architecture (announced by IBM in October 1978 and delivered in August 1979).
The i5/OS operating system was rebranded to IBM i, and retained full backwards compatibility with the previous hardware platforms. ==Summary== The predecessor to AS/400, IBM System/38, was first made available in August 1979 and was marketed as a minicomputer for general business and departmental use.
Much of the software necessary to run the IBM System i is included and integrated into the base operating system. The IBM System i also supports common client–server systems such as ODBC and JDBC for accessing its database from client software such as Java, Microsoft .NET languages and others. ==History== The IBM System i, then known as the AS/400, was the continuation of the System/38 database machine architecture (announced by IBM in October 1978 and delivered in August 1979).
It was first introduced as the AS/400 (Application System/400) in June 1988, alongside the OS/400 operating system.
It was sold alongside other product lines, each with a different architecture (System/3, System/32, System/34, System/36). Realizing the importance of compatibility with the thousands of programs written in legacy code, IBM launched the AS/400 midrange computer line in 1988.
The System/36 was IBM's most successful mini-computer but the architecture had reached its limit. The first AS/400 systems (known by the development code names Silverlake, named for Silver Lake in downtown Rochester, Minnesota, where development of the system took place, and Olympic) were delivered in 1988 under the tag line "Best of Both Worlds" and the product line has been refreshed continually since then.
The architecture of the system allows for future implementation of 128-bit processors when they become available. Although announced in 1988, the AS/400 remains IBM's most recent major architectural shift that was developed wholly internally.
They have 2 CPUs (4 cores) or 4 CPUs (8 cores) in one MCM. === Models of AS/400, iSeries, i5 systems === ==See also== ==References== ==External links== IBM's Power Systems product page IBM Archives: A Brief History of the IBM AS/400 and iSeries The IBM AS400 A technical introduction RPGPGM.COM - An extensive resource of articles giving examples of System i (IBM i) programming AS400i.COM - IBM AS/400 from Basics AS/400 System i Computer-related introductions in 1988
Since the arrival of Lou Gerstner in 1993, IBM has viewed such colossal internal developments as too risky.
After the departure of CEO John Akers in 1993, when IBM looked likely to be split up, Bill Gates commented that the only part of IBM that Microsoft would be interested in was the AS/400 division.
Early AS/400 systems used the same IMPI architecture as the System/38, but later systems moved to the PowerPC-based IBM RS64. It was re-branded multiple times by IBM - first as the AS/400 Advanced Series in 1994, followed by AS/400e (the e standing for e-business) in 1997, eServer iSeries in 2000, eServer i5 (along with OS/400 becoming i5/OS) in 2004, and finally System i in 2006. In April 2008, System i and System p were consolidated into the IBM Power Systems platform.
The address space was expanded in 1995 when the RISC PowerPC RS64 64-bit CPU processor replaced the 48-bit CISC processor. For 64-bit PowerPC processors, the virtual address resides in the rightmost 64 bits of a pointer while it was 48 bits in the S/38 and CISC AS/400.
Early AS/400 systems used the same IMPI architecture as the System/38, but later systems moved to the PowerPC-based IBM RS64. It was re-branded multiple times by IBM - first as the AS/400 Advanced Series in 1994, followed by AS/400e (the e standing for e-business) in 1997, eServer iSeries in 2000, eServer i5 (along with OS/400 becoming i5/OS) in 2004, and finally System i in 2006. In April 2008, System i and System p were consolidated into the IBM Power Systems platform.
(At the time, many of Microsoft's business and financial systems ran on the AS/400 platform, something that ceased to be the case around 1999, with the introduction of Windows 2000.) == Hardware == The AS/400 was originally based on a custom IBM CISC CPU which had an instruction set architecture, known as Internal Microprogrammed Interface (IMPI), similar to that of the IBM System/370.
Early AS/400 systems used the same IMPI architecture as the System/38, but later systems moved to the PowerPC-based IBM RS64. It was re-branded multiple times by IBM - first as the AS/400 Advanced Series in 1994, followed by AS/400e (the e standing for e-business) in 1997, eServer iSeries in 2000, eServer i5 (along with OS/400 becoming i5/OS) in 2004, and finally System i in 2006. In April 2008, System i and System p were consolidated into the IBM Power Systems platform.
Programs on the System/38 were directly compatible with the new AS/400 (after they were 're-encapsulated' by the operating system). In 2000, in accordance with IBM's eServer initiative, the AS/400 series was rebranded as the eServer iSeries.
System i is also capable of supporting multiple instances of AIX, Linux, Lotus Domino, Microsoft Windows 2000 and Windows Server 2003.
In 2008, the release of i5/OS V6R1 (later known as IBM i 6.1) caused similar problems due to changes to the TIMI in that release. In 2000, IBM renamed the AS/400 to iSeries, as part of its e-Server branding initiative.
(At the time, many of Microsoft's business and financial systems ran on the AS/400 platform, something that ceased to be the case around 1999, with the introduction of Windows 2000.) == Hardware == The AS/400 was originally based on a custom IBM CISC CPU which had an instruction set architecture, known as Internal Microprogrammed Interface (IMPI), similar to that of the IBM System/370.
In 2001, it switched to the POWER4 processor from the PowerAS processors used by previous generations. The product line was further extended in 2004 with the introduction of the i5 servers, the first to use the IBM POWER5 processor.
System i is also capable of supporting multiple instances of AIX, Linux, Lotus Domino, Microsoft Windows 2000 and Windows Server 2003.
Early AS/400 systems used the same IMPI architecture as the System/38, but later systems moved to the PowerPC-based IBM RS64. It was re-branded multiple times by IBM - first as the AS/400 Advanced Series in 1994, followed by AS/400e (the e standing for e-business) in 1997, eServer iSeries in 2000, eServer i5 (along with OS/400 becoming i5/OS) in 2004, and finally System i in 2006. In April 2008, System i and System p were consolidated into the IBM Power Systems platform.
In 2001, it switched to the POWER4 processor from the PowerAS processors used by previous generations. The product line was further extended in 2004 with the introduction of the i5 servers, the first to use the IBM POWER5 processor.
Early AS/400 systems used the same IMPI architecture as the System/38, but later systems moved to the PowerPC-based IBM RS64. It was re-branded multiple times by IBM - first as the AS/400 Advanced Series in 1994, followed by AS/400e (the e standing for e-business) in 1997, eServer iSeries in 2000, eServer i5 (along with OS/400 becoming i5/OS) in 2004, and finally System i in 2006. In April 2008, System i and System p were consolidated into the IBM Power Systems platform.
In 2006, it was again rebranded as the IBM System i.
Early AS/400 systems used the same IMPI architecture as the System/38, but later systems moved to the PowerPC-based IBM RS64. It was re-branded multiple times by IBM - first as the AS/400 Advanced Series in 1994, followed by AS/400e (the e standing for e-business) in 1997, eServer iSeries in 2000, eServer i5 (along with OS/400 becoming i5/OS) in 2004, and finally System i in 2006. In April 2008, System i and System p were consolidated into the IBM Power Systems platform.
In 2008, almost 20 years after being introduced, the System i and IBM System p product lines were combined into a new product line called the IBM Power Systems line. The AS/400 operating system was originally named OS/400 (following the pattern begun with OS/360 and followed with OS/2).
In 2008, the operating system was rebranded to IBM i, with the introduction of the IBM Power Systems. The operating system is object-based.
In 2008, the release of i5/OS V6R1 (later known as IBM i 6.1) caused similar problems due to changes to the TIMI in that release. In 2000, IBM renamed the AS/400 to iSeries, as part of its e-Server branding initiative.
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