# Contributors

Many individuals have contributed to the Computer History Simulation Project, including:

Bill Ackerman | PDP-1 consulting
Anders Ahgren | VMS Ethernet simulation, Windows direct device access
Dave Babcock | IBM 1620 simulator debugging and enhancements
Alan Bawden | ITS operating system consulting
Winfried Bergmann | Linux port testing
J. David Bryan | HP debugging and features
Phil Budne | Solaris port testing, PDP-1 software transcription and debugging
Max Burnet | DEC documentation, software, and working examples
Robert Alan Byer | VMS socket support and testing, VMS MMS file
Doug Carman | PDP-11 bootstrap debugging, RSX-11M+ images and debugging
James Carpenter | Linux port testing
Chip Charlot | Mentec Corporation license
Louis Chrétien | Macintosh porting
Dave Conroy | HP 21xx documentation, PDP-10 and 18b PDP debugging
L Peter Deutsch | PDP-1 Lisp source code and permission
Ethan Dicks | PDP-11 2.9 BSD debugging
John Dundas | PDP-11 CPU debugging, programmable clock simulator, DHQ11 simulator
Jonathan Engdahl | PDP-11 device debugging
Carl Friend | Nova and Interdata documentation, RDOS disk images
Megan Gentry | PDP-11 debugging
David Gesswein | PDP-8 and PDP-9/15 documentation, PDP-8 DECtape, disk, and paper tape images, PDP-9/15 DECtape images
Dick Greeley | Digital Equipment Corporation licenses
Gordon Greene | PDP-1 Lisp machine readable source
Lynne Grettum | PDP-11 RT-11, RSTS/E, RSX-11M legal permissions
Franc Grootjen | PDP-11 2.11 BSD debugging
Doug Gwyn | Portability debugging
Kevin Handy | VAX VMS/NetBSD debugging, TS11/TSV05 documentation, make file
Ken Harrenstein | KLH PDP-10 simulator
Bill Haygood | PDP-8 information and simulator, OS/8 disk images
Wolfgang Helbig | DZ11 implementation, PDP-11 debugging
Mark Hittinger | PDP-10 debugging
David Hittner | SCP debugging, DEQNA simulator and Ethernet library
Tarik Isani | DEC Pro/350 simulator
Sellam Ismail | GRI-909 documentation
Jay Jaeger | IBM 1401 consulting
Doug Jones | PDP-8 information and simulator, OS/8 disk images
Brian Knittel | IBM 1130 simulator, SCP extensions for GUI support
Al Kossow | HP 21xx, Varian 620, TI 990, Interdata, SDS, IBM, DEC documentation and software, XVM/DOS recovery
Arthur Krewat | DZ11 changes for the PDP-10
Mirian Crzig Lennox | PDP-10 ITS debugging and instructions
Don Lewine | Data General license
Tim Litt | PDP-10 hardware documentation, schematics, software documentation, media recovery and conversion
Bill McDermith | HP 21xx debugging, 12565A disk simulator
Scott McGregor | The Santa Cruz Operation license
Richard Miller | Interdata UNIX V6 and V7 debugging
Jeff Moffatt | HP 21xx information, documentation, and software
Alec Muffett | Solaris port testing
Terry Newton | HP 21MX debugging
Thord Nilson | DZ11 implementation
Charles Owen | MITS Altair 8800 simulator, Data General Eclipse simulator, IBM System 3 simulator, Nova documentation and simulator debugging, IBM 1401 diagnostics, software, and debugging
Sergio Pedraja | MINGW environment debugging
Derek Peschel | DDT-1 transcription and debugging
Paul Pierce | Media recovery and conversion, IBM 1401 information and documentation
Mark Pizzolato | SCP, Ethernet, VAX simulator debugging and improvements
Hans Pufal | PDP-10 debugging, PDP-15 bootstrap, PDP-9 restoration, Elliot 903 simulator, DOS-15 recovery and debugging
Bruce Ray | Software, documentation, bug fixes, and new devices for the Nova, OS/2 porting
Craig St Clair | Digital Equipment Corporation archives
Richard Schedler | Public repository maintenance
Peter Schorn | Macintosh porting; Altair Z80 simulator
Stephen Schultz | PDP-11 2.x BSD debugging
Olaf Seibert | NetBSD port testing
Brian and Barry Silverman | PDP-1 simulator, Lisp and Spacewar sources
Tim Shoppa | Nova documentation and software, PDP-10 and PDP-11 software archive, site hosting for SIMH
Michael Short | IBM 1620 debugging
Chris Smith | PDP-10 floating point debugging
Van Snyder | IBM 1401 zero footprint card and tape bootstraps, testing and debug of numerous fine points of instructions and I/O
Michael Somos | PDP-1 debugging
Hans-Michael Stahl | OS/2 port, TERMIOS terminal emulator implementation
Ken Staley | 4.3BSD kit for the VAX
Tim Stark | TS10 PDP-10 simulator; VAX debugging
Larry Stewart | Original suggestion for the project
Chris Suddick | PDP-11 simulator floating point debugging
Ben Supnik | Macintosh timing routine
Bob Supnik | SIMH simulators
Ben Thomas | VMS terminal emulator implementation
Deb Toivonen | Digital Equipment Corporation archives
Warren Toomey | PDP Unix Preservation Society (PUPS), PDP-11 UNIX disk images
Peter Trimmel | VAX debugging, Linux large file support
Mike Umbricht | DEC documentation, H316 schematics and documentation
Leendert Van Doorn | PDP-11 UNIX V6 debugging, TERMIOS terminal emulator implementation
Fred Van Kempen | DEUNA code, RK611 emulator, PDP-11 debugging, VAX/Ultrix debugging
Holger Veit | OS/2 socket support
David J Waks | PDP-7 SIM8 and PDP-8 ESI-X source code and permission
Tom West | Nova documentation
Adrian Wise | H316 simulator, documentation, and software
John Wilson | PDP-11 simulator and RT-11, RSX-11M, and RSTS/E disk images
Joe Young | RP debugging on Ultrix-11 and BSD

In addition, the following companies have graciously licensed their software for hobbyist use:

Data General Corporation
Digital Equipment Corporation
Compaq Computer Corporation
Hewlett-Packard Corporation
Mentec Corporation
The Santa Cruz Operation
Caldera Corporation

Last, but hardly least, I would like to thank the Computer History Museum, Mountain View, California, and the Rhode Island Retro-Computing Society, Providence, Rhode Island, and their staffs and volunteers, for their support and help.

Updated 30-Jun-2004 by Bob Supnik (bob AT supnik DOT org - anti-spam encoded)