Names

The AS/400 / iSeries / i5 / System i5 thas had a number of names over the years.

It started life as the Application System/400 ... or AS/400.

It combined the best of S/38 and S/36, leaning on S/38 for OS foundation and S/36 for user-friendliness. S/36 and S/38 in turn, have a rich heritage in the S/34 which in its hey day had a revolutionary 48 bit OS at a time when 8 bit was standard for PCs.

Many IBM customers on S/36 SSP were slow to embrace the AS/400 so IBM introduced the Advanced System 36 ... or AS/36 which had two models, the AS/236 and AS/436. The AS/436 could run SSP or OS/400 with SSP as a guest OS and had an upgrade path to AS/400 models. Interestingly the AS/236 was the first 64 bit and RISC based entry in the AS/400 family.

Before the world moved to using PCs as the main interface to talk to the 400, we had IBM Keyboards with keys that are now largely disappeared from the keyboards of today.

Around the year 2000, IBM changed it's name to eServer iSeries (The "i" indicating "Integrated"?)

Then, in 2004, the name was changed to i5. The "5" referring to the Power5 Processor that was at the heart of the system. At the same time OS/400 was renamed to i5/OS.

In 2006 the name changed again. This time the family name changed to System i which incorporates all systems from AS/400 throuh AS/400e to iSereies and including today's hardware. The current machine in the family is the the System i5. Theoretically the next generation will be the System i6 when the POWER6 chips are released.

No need for confusion, the truth is right here!