Here's a link to Inside the AS/400 by Frank Soltis, one of the lead designers. It's an interesting introduction to the AS/400, up to the POWER transition. The

Here's a link to Inside the AS/400 by Frank Soltis, one of the lead designers. It's an interesting introduction to the AS/400, up to the POWER transition. There's also Fortress Rochester by the same author that goes into the iSeries / POWER4, but I haven't found a copy on line. https://archive.org/details/insideas4000000solt/ https://archive.org/details/insideas4000000solt/