There were many similarities between CP/M and MS-DOS. Inspired by the 8-bit CP/M, Paterson’s 16-bit operating system used similar commands and some of the same programming interfaces, but it was a different internal implementation and used different file storage formats.
At Digital Research, Gary Kildall’s opinion was that MS-DOS infringed on their copyrights for CP/M. He was furious, and confronted both Bill Gates at Microsoft and IBM, but his lawyer recommended against a lawsuit. ”Rather than sue, Kildall agreed to license CP/M to Big Blue. But he was astounded that when the PC was released, IBM charged $240 per copy for CP/M, and only $40 for DOS.”  Needless to say, the Microsoft offering became the dominant operating system for the IBM PC.
Paterson denied any wrongdoing. “I told him [Kildall] I didn’t copy anything. I just took his printed documentation and did something that did the same thing.” 
Thirty years later, Bob Zeidman, a programmer and expert in software intellectual property cases, conducted a detailed forensic examination of the code of QDOS, CP/M and PC-DOS. His conclusion? “QDOS was absolutely not copied from CP/M, and MS-DOS showed no signs of copying either. Kildall’s accusations about Bill Gates were totally groundless.” 
電子信號調適現象 - 一個簡單的【喇叭聲音】調適電路，用途上？不！觀念上符合所有【電子機構】的電路迴圈概念。 黃線 = 信號 紅線 = 火線 黑線 = 輸出 想增加音量就從電池著手 想改善音質就要注意【線路材質、IC效果】，當然？也可能是喇叭無法輸出過大的功率。 這樣的簡單電路，卻恰好足以描繪大多數電路配置觀念。 當 I...