IBM SCRIPT
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SCRIPT is an IBM text formatter developed in the 1980s, used for printing documents in the first laser printers. It was a predecessor to the widely-deployed PostScript known today, and the LaTeX language. It was generated from GML (Generalized Markup Language), itself a predecessor to SGML.
Both Script and GML were part of IBM's Document Composition Facility (DCF), used in the System/370 platform.