Software
IBM supplied the following software for the 1620:
- 1620 Symbolic Programming System (SPS) (assembly language)
- FORTRAN
- FORTRAN II - required 40,000 digits or more of memory
- GOTRAN - simplified, interpreted version of FORTRAN for "load and go" operation
- Monitor I and Monitor II - disk operating systems.
The Monitors provided disk based versions of 1620 SPS IId, FORTRAN IId as well as a DUP (Disk Utility Program). Both Monitor systems required 20,000 digits or more of memory and 1 or more 1311 disk drives.
A collection of IBM 1620 related manuals in PDF format exists at
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