Editing IBM Series/1 (section)

==Software support==
The Series/1 could be ordered with or without operating system. Available were either of two mutually exclusive [[operating system]]s: [[Event Driven Executive|Event Driven Executive (EDX)]] or Realtime Programming System (RPS).  Systems using EDX were primarily programmed using [[Event Driven Executive|Event Driven Language (EDL)]], though high level languages such as [[Fortran#FORTRAN IV|FORTRAN IV]], [[PL/I]], [[Pascal (programming language)|Pascal]] and [[COBOL]] were also available.  EDL delivered output in IBM machine code for [[IBM System/3|System/3]] or [[IBM System/7|System/7]] and for the Series/1 by an [[emulator]]. Although the Series/1 is 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.<ref>{{cite web
|url=http://www2.cit.cornell.edu/computer/history/Newman.html
|title=Mike Newman Recollections, 1961–1999
|work=Oral and Personal Histories of Computing at Cornell
|date=1999-09-17
|author=John W. Rudan
|at=¶ 8
|publisher=Cornell University}}
</ref> Series/1 was also the first computer that IBM supported for [[Unix]].<ref name="fiedler198310">{{cite news | url=https://archive.org/stream/byte-magazine-1983-10/1983_10_BYTE_08-10_UNIX#page/n133/mode/2up | title=The Unix Tutorial / Part 3: Unix in the Microcomputer Marketplace | work=BYTE | date=October 1983 | access-date=30 January 2015 | author=Fiedler, Ryan | pages=132}}</ref><ref> [https://dl.acm.org/doi/pdf/10.1145/358476.358504] </ref>

Systems without an 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 [[Assembly language#Macros|macro assembler]], a [[Linker (computing)|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.<ref>{{Cite book
 |last = Schoeffler
 |first = James D.
 |year = 1978
 |title = IBM series/1: The small computer concept
 |publisher=International Business Machines Corporation
 |location = Atlanta, Ga
 |id = SH30-0237
}}</ref>