Artifact ac2cd633923aaee1179636305852dba7a661d1f7fc35124b7d5730fb82dabf57:
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psl-1983/3-1/doc/nmode/nm-subsystems.ibm
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2020-04-21 19:40:01
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— Add Reduce 3.0 to the historical section of the archive, and some more
files relating to version sof PSL from the early 1980s. Thanks are due to
Paul McJones and Nelson Beebe for these, as well as to all the original
authors.git-svn-id: https://svn.code.sf.net/p/reduce-algebra/code/historical@5328 2bfe0521-f11c-4a00-b80e-6202646ff360 (user: arthurcnorman@users.sourceforge.net, size: 4614) [annotate] [blame] [check-ins using] [more...]
,MOD - R 44X (11 April 1983) <PSL.NMODE-DOC>NM-SUBSYSTEMS.ibm PLA 97_LAS 80 0_FIR 2_INT 1 6.0_TYP 160 163 162 193_INP 12 101_MAR 2 ,END ,PRO 201 OUT 160_202 OUT 163_203 OUT 162_204 OUT 193 205 INP 12 101_206 INP 12 102 ,END ,DEFINE UNIT SPACE FUNCTION ,END 201/NMODE Manual (Moving Up And Down Levels) Page 7-1 202/7. Moving Up And Down Levels 201/Subsystems and recursive editing levels are two states in which you are temporarily doing something other than editing the visited file as usual. For example, you might be editing the arguments prompted for by a M-X command, or using a browser. 202/7.1 Subsystems 201/A 202/subsystem 201/is an NMODE function which is an interactive program in its own right: it reads commands in a language of its own, and displays the results. You enter a subsystem by typing an NMODE command which invokes it. Once entered, the subsystem usually runs until a specific command to exit the subsystem is typed. An example of an NMODE subsystem is the buffer-browser, invoked by typing C-X C-B. The commands understood by a subsystem are usually not like NMODE commands, because their purpose is something other than editing text. In the buffer-browser, for instance, the commands are tailored to moving up and down a list of the existing buffers, reordering this list in various ways, and to deleting buffers. In NMODE, most commands are Control or Meta characters because printing characters insert themselves. In most subsystems, there is no insertion of text, so non-Control non-Meta characters can be the commands. While you are inside a subsystem, the mode line identifies the subsystem by identifying the mode of the current buffer. The special properties of the subsystem are due to the kinds of commands that are available in this mode, and to the keys that the mode associates with them. Because each buffer has its own associated mode at any given time, if a user moves out of the buffer associated with the subsystem into an ordinary text buffer, he/she will have left the subsystem, even though he/she will not have used the normal command for doing so. Because each subsystem implements its own commands, we cannot guarantee anything about them. However, there are conventions for what certain commands ought to do: Space Moves downwards, like C-N in NMODE. Q Exits normally. Help or ? Prints documentation on the subsystem's commands. Not all of these necessarily exist in every subsystem, however. 202/7.2 Recursive Editing Levels 201/A 202/recursive editing level 201/is a state in which part of the execution of one command involves doing some editing. You may be editing the file you are working on, or you may be editing completely something totally different from what you were working on at top level. Currently, the completion of extended commands, the preparation of prompted input strings, and the examination of buffers in the kill-some-buffers-command function all involve 201/Page 7-2 NMODE Manual (Recursive Editing Levels) recursive editing levels within which the full power of NMODE is available. 202/7.3 Exiting Levels; Exiting NMODE 201/L] On the hp9836, <STOP> will exit from NMODE to the hp9836 workstation top level command interpreter. C-X C-Z will exit from NMODE into the PSL interpreter, as will C-] L (Lisp-L) in Lisp mode.