Biographical sketches of authors

Joachim von Buttlar   IBM Deutschland Entwicklung GmbH, Schoenaicherstrasse 220, 71032 Boeblingen, Germany (joachim_von_buttlar@de.ibm.com). Mr. von Buttlar is an Advisory Engineer in the zSeries I/O Microcode Development group. He received an M.S. degree in computer science (Dipl.-Inform.) from the Technical University of Berlin in 1983. In 1984, he joined the IBM development laboratories in Boeblingen, Germany, to work on microcode development for the IBM 3092, 9221, and 9672 systems. During the 9221 project from 1990 to 1991, he worked as Liaison Engineer on international assignment in Endicott, New York. In 1997 he initiated the z/CECSIM project, developed its concepts, and implemented the simulator's kernel. His current responsibility is z/CECSIM for the next generation of zSeries systems.

Harald Böhm   IBM Deutschland Entwicklung GmbH, Schoenaicherstrasse 220, 71032 Boeblingen, Germany (hboehm@de.ibm.com). Dr. Böhm received a Ph.D. degree in mathematics from the University of Karlsruhe in 1984, with research experience in numerical analysis. He subsequently joined the IBM development laboratories in Boeblingen to develop software for numerical computations. Since 1987 his activities have involved the verification of processor hardware and the development of microcode for S/370, S/390, and zSeries servers.

Reinhard Ernst   IBM Deutschland Entwicklung GmbH, Schoenaicherstrasse 220, 71032 Boeblingen, Germany (rernst@de.ibm.com). Dr. Ernst received M.S. and Ph.D. degrees in physics from the University of Bonn, Germany, in 1997 and 2000, respectively. In 2000 he joined the IBM development laboratories in Boeblingen. His current responsibilities are i390 code development in the I/O microcode group and the I/O model for z/CECSIM.

Axel Horsch   IBM Deutschland Entwicklung GmbH, Schoenaicherstrasse 220, 71032 Boeblingen, Germany (ahorsch@de.ibm.com). Mr. Horsch received a Dipl.-Ing. degree in electrical engineering from the Ingenieurschule in Augsburg, Germany, in 1965. That same year he joined the IBM development laboratories in Boeblingen as a test engineer to work on system testing of IBM 370/125, 4331, 4361, and 9370. He was responsible for system I/O attachment testing, system microcode testing, and system microcode error projections. In 1989 he joined the S/390 system microcode development group. He is currently responsible for the design and development of i390 code for channel service functions and for the i390 code simulation of all S/390- and z/Architecture-based systems.

Andreas Kohler   IBM Deutschland Entwicklung GmbH, Schoenaicherstrasse 220, 71032 Boeblingen, Germany (akohler@de.ibm.com). Dr. Kohler received M.S. and Ph.D. degrees in physics from the University of Stuttgart, Germany, in 1993 and 1999, respectively. In 1999 he joined the IBM development laboratories in Boeblingen, Germany. His current responsibilities in zSeries I/O microcode development include test tools, simulation, and error-recovery code.

Herbert Schein   IBM Deutschland Entwicklung GmbH, Schoenaicherstrasse 220, 71032 Boeblingen, Germany (schein@de.ibm.com). Dr. Schein studied at the Technical University of Vienna, Austria, where he received a Dipl. Ing. degree in mathematics in 1972 and a Dr. Ing. degree in computer science in 1973. In 1974 he joined the IBM development laboratories in Boeblingen, Germany. He initially developed microcode for S/370 disk attachments, and subsequently worked in various tool projects. He is currently involved in the development and continued enhancement of components for z/CECSIM.

Michael Stetter   IBM Deutschland Entwicklung GmbH, Schoenaicherstrasse 220, 71032 Boeblingen, Germany (stetter@de.ibm.com). Mr. Stetter is a Staff Software Engineer in the zSeries system simulation group. He graduated from the University of Ulm, Germany, in 1997 with a diploma degree in mathematics and economics. In January 1998 he joined the IBM development laboratories in Boeblingen, Germany. He has worked in a variety of system simulation assignments, and is currently I/O microcode simulation team leader and z/CECSIM representative for the next generation of zSeries systems. Mr. Stetter is a PMI^®-certified project management professional and received the master certificate in project management from George Washington University, Washington, D.C.

Klaus Theurich   IBM Deutschland Entwicklung GmbH, Schoenaicherstrasse 220, 71032 Boeblingen, Germany (theurich@de.ibm.com). Mr. Theurich studied electrical engineering at the Fachhochschule Esslingen, graduating in 1987. He joined the IBM development laboratories in Boeblingen that same year to work on S/370 system testing and development for the Parallel Processing Compute Server (PPCS), and on hardware development for the first intersystem channel (ISC). In 1994, he joined the S/390 I/O microcode development effort. During an international assignment from 1998 to 2000 in Poughkeepsie, New York, he worked on a new concept for simulation of coupling microcode. He is currently responsible for investigating the Infiniband simulation concept.