Michael wrote: 36 emulator is running on top of.) Eric It's actually an early version of the RISC processor used in the more modern AS/400/iSeries machines. The memory is fuzzy now, so I may have some details incorrect. It was around 1994 and the System 36 was long since gone, and we were deep in product development of the new RISC based AS/400s. One use of the partially developed machine was as a System 36 replacement - with an emulator running on top of the partial OS of the new machine we could make the appearance of a System 36, and at a much better speed at that. Remember that for the port to RISC IBM had to rewrite a good portion of the OS to accomodate the new processor and hardware architecture. The older CISC based AS/400s used a 48 bit processor. The new ones were using a 64 bit variant of the Power PC. I don't think that most of the customers for the Advanced 36 (as this box was called) were aware that they were running on a pretty advanced PowerPC based machine. It was a nice trick. Mike