BASIC-11 was a dialect of the basic language for PDP-11 operating systems such as RSX-11, RT-11, TSX and TSX-Plus. It was a classic BASIC in that it used line numbers, supported line number editing, and classic function syntax. It provided extended support for user-defined functions, external sequential disk files, and linking with assembler language modules for device support and operating system interfaces.
^Basic-11 documentation, 1. May 2011, David's Blog, This was quite hard to find, so here is a zip file containing some documentation for Basic-11., contains BASIC-11 Language Reference Manual - September 1976
^Basic-11 Tool Gets Update, Computerworld, 27 Jul 1981, Page 54, ...General Systems, Inc. is offering Release 3.0 of its business Basic-11 accounting system,...All programs are written in Basic-11 and will run on any Digital Equipment Corp. PDP-11 running RT-11, TSX or TSX-Plus operating systems...
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