||This article's lead section may not adequately summarize key points of its contents. (May 2013)|
Jeri Ellsworth, 2008
|Born||1974 (age 38–39)
|Known for||Entrepreneur and self-taught computer chip designer|
Jeri Ellsworth (born 1974) is an American entrepreneur and self-taught computer chip designer. She is best known for creating a Commodore 64 emulator within a joystick, in 2004, called Commodore 30-in-1 Direct to TV. That "computer in a joystick" could run 30 video games from the early 1980s, and was very popular during the 2004 Christmas season, at peak selling over 70,000 units in a single day via the QVC shopping channel. Ellsworth currently lives in Seattle.
Ellsworth was born in Yamhill, Oregon, and grew up in the town of Dallas, Oregon, where she was raised by her father, a local Mobil service station owner. As a child, she persuaded her father to let her use a Commodore 64 computer which had been originally purchased for her brother. She taught herself to program by reading the C64's manuals. While at high school, she drove dirt-track race cars with her father, and then began designing new models in his workshop, eventually selling her own custom race cars. This allowed her to drop out of high school to continue the business.
In 1995, at the age of 21, she decided that she wanted to get away from the race car business, and she and a friend started an early Intel 486-PC-based business, assembling and selling computers. When she and her partner later had a disagreement, Ellsworth opened a separate business in competition. This new business became a chain of four stores, "Computers Made Easy", selling computer equipment in towns in Oregon. She ran that chain until selling it in 2000, at which point she moved to Walla Walla, Washington and attended Walla Walla College, studying circuit design for about a year. She dropped out due to a "cultural mismatch"; Ellsworth said that questioning professors' answers was frowned upon.
In 2000, Ellsworth attended her first Commodore exposition, where she unveiled a prototype video expansion for the C64. This project later evolved to become the CommodoreOne, a.k.a. the C-One, and C64-DTV.
Ellsworth then began designing computer circuits that mimicked the behavior of her first computer, the Commodore 64. In this way, in 2002, she designed the chip used in the C-One, a board which was co-designed and manufactured by Jens Schönfeld, as an enhanced Commodore 64 which could also emulate other home computers of the early 1980s, including the VIC-20 and Sinclair ZX81. She displayed the C-1 at a technology conference, and she and Schönfeld received enough business to sell a few hundred units. This also led to Ellsworth receiving a job offer from Mammoth Toys, a company which hired her to design the "computer in a chip" for the Commodore-emulating joystick. She began the project in June 2004, and had the project ready to ship by that Christmas. It sold over a half-million units, in the USA, Europe, and elsewhere.
Ellsworth is a pinball machine expert and owns over 90 full sized pinball arcade games. Ellsworth lists some of the pinball machines she owns (at 7:37). She runs the business, Ricochet Pinball.
On December 3, 2010 she released information on how to build a TSA "naked" scanner using repurposed satellite antenna parts.
Ellsworth has published numerous technical articles online regarding subjects as diverse as homemade semiconductors (2009), homemade electroluminescent (EL) displays (2010), EL phosphor manufacture from common ingredients and ways to make transparent EL backplanes without using expensive indium-tin-oxide coated glass.
Ellsworth was a keynote speaker at the Embedded Systems Conference on May 5, 2011.
In early 2012 Ellsworth was hired by Valve Corporation (along with several other notable hardware hackers) to work on gaming hardware. Ellsworth was fired the following year, along with several other Valve employees.
On May 18, 2013, Ellsworth revealed that she had developed an Augmented Reality development system named castAR with fellow ex-Valve engineer Rick Johnson , with the blessing of Valve's Gabe Newell.  and would be funding it via Kickstarter later in the year. Her start-up company, Technical Illusions, is developing castAR. 
- "Demo Coding with FPGAs: We Don't Need No Stinking CPUs". Notacon 5. April 4, 2008.
- Markoff, John (December 20, 2004). "A Toy with a Story". New York Times.
- Ellsworth, Jeri (November 4, 2012). Short Circuits - One Bit ADC.
- "Jeri Ellsworth, self-taught engineer, talks about her career". youtube.com.
- Monahan, Matt (January 25, 2005). "Joy of electronics sticks with woman, sparking invention". Statesman Journal. Archived from the original on 2006-02-21. Retrieved 2011-03-22.
- "C-One website". C64upgra.de. Retrieved 2011-03-23.
- "Events filled with DIY projects, science, demos, recycling, entertainment, and fun". Makerfaire.com. Retrieved 2011-03-23.
- Torrone, Phil (February 25, 2010). "MacGyver of the Day: Electronics Hacker Jeri Ellsworth". Lifehacker.com.
- "Make Your Own TSA "Naked" Scanner". Hack a Day. December 3, 2010. Retrieved 2011-03-23.
- "Make: Online | Jeri Ellsworth turns an LCD into an EL display". Blog.makezine.com. June 11, 2010. Retrieved 2011-03-23.
- ""I'm working at Valve on nextgen gaming hardware" - Jeri Ellsworth". valvetime.net.
- Gamasutra: Several out of work as Valve makes 'large decisions' about its future
- Engadget: Valve's Gabe Newell on reported layoffs
- "How two Valve engineers walked away with the company's augmented reality glasses"
- "cast AR hands-on with Jeri Ellsworth at Maker Faire 2013"
- "Technical Illusions"
|Wikimedia Commons has media related to: Jeri Ellsworth|
- Official website
- Jeri Ellsworth on Twitter
- Jeri Ellsworth's channel on YouTube
- Jeri Ellsworth's channel on YouTube (Less formal companion channel.)
- Jeri Ellsworth's channel on Vimeo
- Jeri Ellsworth on Flickr
- Jeri Ellsworth at the March 2010 Portland Linux General Meeting on Ustream
- Stanford lecture, May 18, 2005 in video stream