Each type of CPU has its own machine language and assembly language, so an assembly language program written for one type of CPU won't run on another. In the early days of programming, all programs were written in assembly language. Now, most programs are written in a high-level language such as FORTRAN or C. Programmers still use assembly language when speed is essential or when they need to perform an operation that isn't possible in a high-level language.

Assembly Internet resources 
Contains a collection of resources for assembly language including books, FAQs, coding resources, tutorials, newsgroups, and hot lists.

Assembly Language Resources 
Comprehensive collection of resources that includes tutorials, FAQs, related sites, vendor lists, and conference information.

Assembly programming resources
Provides a comprehensive set of links to assembly programming topics. The information is organized in a table and offers the following categories: assembly world wide Web pages, newsgroups, FAQs, FTP sites, and technical documentation.

Yahoo!'s assembly language page
Yahoo!'s directory of assembly language links.