Mike Cowlishaw, IBM Fellow, presented "Changing the Way Computers Compute" at the Hillgang user group meeting on 24 April 2008. This presentation explains the need for hardware-accelerated binary decimal formats and the emerging IEEE standards in this area.
IBM zSeries and S/390 mainframe hardware and software
There is now an IBM mainframe overview and history presentation available from the SNA publications web site. It gives a history of both the S/3xx hardware and S/3xx operating systems for those folks new to this platform
Several Sine Nomine Associates engineers presented on a variety of topics at the SHARE 98 conference in Nashville. These are the PDF versions of the handouts from those presentations.