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.” 
虛擬引擎的建構 - 一些玩過【電子遊樂器 虛擬器】的人，應該都知道【SDL】是一種很強悍的【Plugin】，而且支援多種不同語言編譯。 例如： 2002年出版的PS2遊戲【SD 鋼彈G 世代 NEO / SD Gundam G Generation NEO 】 2009年出版的PS2遊戲【SD 鋼彈G世代 世紀戰役 / SD G...