http://kor.i2p/books/The%20C%20Programming%20Language%20by%20K&R/preface1.html
Production compilers also exist
for several other machines, including the IBM System/370, the Honeywell 6000,
and the Interdata 8/32. C is not tied to any particular hardware or system,
however, and it is easy to write programs that will run without change on any
machine that supports C.