3.ASCII characters are the lowest common denominator for computers nowadays and practically every modern computer can interpret binary data into these characters.
18.So, various extensions to ASCII were made that added new semigraphical characters, like IBM's CP437 character set, seen here, which was used in DOS.
因此,对 ASCII 进行了各种扩展,添加了新的半图形字符,如 IBM 的 CP437 字符集,在这里,它在 DOS 中使用。机翻
20.Because ASCII was such an early standard, it became widely used, and critically, allowed different computers built by different companies to exchange data.