A conversational compiler for full PL/I

Most language processors used with terminal systems have major restrictions in power and ease of use. The proliferation of custom-built conversational languages and compilers points to the lack of a terminal-oriented implementation of one of the major languages acceptable to a wide and varied class of users. The PL/I Checkout Compiler, released by IBM in November 1971 and developed at the Hursley Laboratories near Winchester, is intended to plug this gap. Working under the Time Sharin