A modular and structured control language interpreter

The purpose to this paper is to describe the functional characteristics and the structure of the control Language Interpreter (CLI) for Pisa Software Laboratory (PSL) which has been implemented at IEI-CNR on a virtual machine generated by CP-67 on an IBM 360/67 computer. The CLI is itself a modular system and enables the user to converse with the PSL using the typewriter as a system console. This paper discusses a "guided" modularization as a mechanism to achieve the aims of the CLI, namely:Modularity, extensibility and reliability.