Software Support
The Series/1 could be ordered with or without operating system. Available were either of two mutually exclusive operating systems: Event Driven Executive (EDX) or Realtime Programming System (RPS). Systems using EDX were primarily programmed using Event Driven Language (EDL), though high level languages such as FORTRAN IV, PL/I, Pascal and COBOL were also available. EDL delivered output in IBM machine code for System/3 or System/7 and for the System/1 by an emulator. Although the Series/1 is grossly underpowered by today's standards, a robust multi-user operating environment (RPS) was available along with several additional high level languages for the RPS OS. The EDX operating system was originally ported from the System/7.
Systems without operating system were intended for users needing dedicated applications that did not require the full capabilities of either OS. Applications were built using a set of standalone programs, called the Base Program Preparation Facilities, consisting of a macro assembler, a link editor and some basic utilities. A set of modules, called Control Program Support (CPS), was linked with the application to provide task management, data processing input/output support and initial program loading for both disks and diskettes.
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