“Oral History of Joseph Killian, Interviewed by: Bob Fraley, Edited by: Dag Spicer, Recorded: January 26, 2007, Mountain View, California, CHM Reference number: X3879.2007,”. Computer History Museum (2007年1月26日). 2013年6月3日閲覧。 “Killian: "[...] Intel had hired him a few months earlier to write a control program monitor to run on their little demo system for 8008 and now 8080. [...] Glenn knew this and he would be talking with Gary, and he started twisting Gary's arm. He said, "Hey Gary, why can't we run this in this IMSAI?" "The I/O's all different, won't run." But Glenn persists and finally makes a deal with Gary. He says, "Okay Gary, if you split out the I/O, I'll write the BIOS, basic I/O's system," and Glenn named it then. "We'll split it out separately. I'll write that part, as long as you can make a division in the program there." And he got Gary to do that and Glenn put those two pieces together and was running Gary's CP/M on an IMSAI. Glenn let us know that, and it wasn't too much later than Bill（英語版） was down there making arrangements with Gary Kildall to license CP/M. [...] Now that the BIOS is separated out, anybody could write a BIOS for their machine, if it was 8080-based, and run this, so he started selling that separately under the company Digital Research that he formed and did quite well."”
Killian, A. Joseph "Joe" (2001年). “Gary Kildall's CP/M: Some early CP/M history - 1976-1977”. Thomas "Todd" Fischer, IMSAI. 2013年6月3日閲覧。 “[...] When we failed to produce an operating system in a timely manner, Glenn started talking with Gary about CPM, which Gary had written for Intel under contract. It took several months of twisting Gary's arm to get Gary to port it to the 8080. The final success came when Glenn talked Gary into just separating the I/O from the rest of it, with Glenn promising to re-write the I/O module for the IMSAI 8080 (which he did). So CPM on the IMSAI was a joint effort between Glenn and Gary. [...]”
Rolander, Tom (8 August 2007). "Scoble Show". PodTech.net (Interview). Interviewed by Robert Scoble. 2007年9月13日閲覧。
retrotechnology.com
Kildall, Gary A. (1980年1月). “The History of CP/M, The Evolution of an Industry: One Person's Viewpoint”. Dr. Dobb's Journal of Computer Calisthenics & Orthodontia. pp. 6–7. 2013年6月3日閲覧。 “[...] The first commercial licensing of CP/M took place in 1975 with contracts between Digital Systems and Omron of America for use in their intelligent terminal, and with Lawrence Livermore Laboratories where CP/M was used to monitor programs in the Octopus network. Little attention was paid to CP/M for about a year. In my spare time, I worked to improve overall facilities [...] By this time, CP/M had been adapted for four different controllers. [...] In 1976, Glenn Ewing approached me with a problem: Imsai, Incorporated, for whom Glenn consulted, had shipped a large number of disk subsystems with a promise that an operating system would follow. I was somewhat reluctant to adapt CP/M to yet another controller, and thus the notion of a separated Basic I/O System (BIOS) evolved. In principle, the hardware dependent portions of CP/M were concentrated in the BIOS, thus allowing Glenn, or anyone else, to adapt CP/M to the Imsai equipment. Imsai was subsequently licensed to distribute CP/M version 1.3, which eventually evolved into an operating system called IMDOS. [...]”
tomrolander.com
Rolander, Tom (1994年7月15日). “Eulogy”. Tom Rolander's Website and Album. 2006年11月30日閲覧。
“Oral History of Joseph Killian, Interviewed by: Bob Fraley, Edited by: Dag Spicer, Recorded: January 26, 2007, Mountain View, California, CHM Reference number: X3879.2007,”. Computer History Museum (2007年1月26日). 2013年6月3日閲覧。 “Killian: "[...] Intel had hired him a few months earlier to write a control program monitor to run on their little demo system for 8008 and now 8080. [...] Glenn knew this and he would be talking with Gary, and he started twisting Gary's arm. He said, "Hey Gary, why can't we run this in this IMSAI?" "The I/O's all different, won't run." But Glenn persists and finally makes a deal with Gary. He says, "Okay Gary, if you split out the I/O, I'll write the BIOS, basic I/O's system," and Glenn named it then. "We'll split it out separately. I'll write that part, as long as you can make a division in the program there." And he got Gary to do that and Glenn put those two pieces together and was running Gary's CP/M on an IMSAI. Glenn let us know that, and it wasn't too much later than Bill（英語版） was down there making arrangements with Gary Kildall to license CP/M. [...] Now that the BIOS is separated out, anybody could write a BIOS for their machine, if it was 8080-based, and run this, so he started selling that separately under the company Digital Research that he formed and did quite well."”
