QED addressed teleprinter usage. Support for a CRT display was not added since design considerations for such hardware differ significantly from a teleprinter.[5]
Later implementations
Ken Thompson later wrote a version for CTSS; this version was notable for introducing regular expressions. Thompson rewrote QED in BCPL for Multics. The Multics version was ported to the GE-600 system used at Bell Labs in the late 1960s under GECOS and later GCOS after Honeywell took over GE's computer business. The GECOS-GCOS port used I/O routines written by A. W. Winklehoff. Dennis Ritchie, Ken Thompson and Brian Kernighan wrote the QED manuals used at Bell Labs.[6][7][8]
Given that the authors were the primary developers of the Unix operating system, it is natural that QED had a strong influence on the classic UNIX text editors ed, sed and their descendants such as ex and sam,[9] and more distantly AWK and Perl.
A version of QED named FRED (Friendly Editor) was written at the
University of Waterloo for Honeywell systems[10] by Peter Fraser. A University of Toronto team consisting of Tom Duff, Rob Pike, Hugh Redelmeier, and David Tilbrook implemented a version of QED that runs on UNIX; David Tilbrook later included QED as part of his QEF tool set.
QED was also used as a character-oriented editor on the Norwegian-made Norsk Data systems, first Nord TSS, then Sintran III. It was implemented for the Nord-1 computer in 1971 by Bo Lewendal who after working with Deutsch and Lampson at Project Genie and at the Berkeley Computer Corporation, had taken a job with Norsk Data (and who developed the Nord TSS later in 1971).[citation needed]
↑D. M. Ritchie and K. L. Thompson, "QED Text Editor", MM-70-1373-3 (June 1970), reprinted as "QED Text Editor Reference Manual", MHCC-004, Murray Hill Computing, Bell Laboratories (October 1972).
↑B. W. Kernighan, "A Tutorial Introduction to the QED Text Editor under GE-TSS", MM-70-1373-6 (June 1970), reprinted as "Tutorial Introduction to QED Text Editor", MHCC-002, Murray Hill Computing, Bell Laboratories (October, 1972).
↑B. W. Kernighan, "A Guide to the Advanced Use of QED Text Editor", MM-70-1373-7 (July 1970), reprinted as "A Guide to Advanced Use of QED Text Editor", MHCC-003, Murray Hill Computing, Bell Laboratories (October, 1972).
