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-
-
- These files contain the necessary material for producing
-APL documents with TeX. It should be pointed out that as written
-in an article published in TUGboat, the system as such can be
-described as a straightforward solution to the problem of making
-nice documents containing APL code. Instead of trying to achieve
-a completed result, we tell the reader how to use existing MetaFont
-character descriptions as far as possible to provide an APL font
-of reasonably fine quality. Further development is left to the users.
-Combined with suitable TeX macros using Digital's mnemonics -- chosen
-because of the popularity of the interpreter among APL users
-(it is really the only one used at our site) -- the font can be used
-smoothly enough. Furthermore, if combined with an APL workspace
-providing functions for an automatic conversion of APL workspaces
-into TeX code, the system can be used to merge pre-existing
-APL code into documents without the pain of re-writing the code
-in Digital's 2-letter mnemonics.
- To produce pixel files from the MetaFont file CMAPL10.MF,
-you have to run MetaFont in your local machine. By typing METAFONT
-you should get the prompt symbol '*'. It may be necessary to use
-the form
-
- METAFONT\INPUT_DIRECTORY = XXXXXX
-
-where XXXXXX is the global name of the directory where the basic
-CMMF definitions can be found.
-The following discussion will then get MetaFont to produce a generic
-font file CMAPL10.360GF:
-
- * \relax;
- * \mode = imagen;
- * \mag = 1.2;
- * input cmapl10
-
-Here \mode = imagen was used to get a pixel file for a laserprinter
-with the resolution 200 times 200 pixels per square inch. It is
-possible that the definition of 'imagen' is different at your local
-site; in the case of error ask the person who installed your local
-MetaFont. Notice that \mag = 1.2 is needed in case you want to get
-magnified pixels. The final pixel (because of the resolution 200)
-files will then be named CMAPL10.1800PXL (or whatever you choose
-to call them). If you want to produce 'small' pixel files for example
-for a screen previewer, use \mag = xxx with an appropriate constant xxx.
-(You can check the form of characters obtained on a teletype terminal
-by using the program GFTYPE.) Finally, you get a pixel file from
-CMAPL10.xxxGF by running the program GF(TO)PXL.EXE, which should be
-found together with MetaFont.
- Some people want to use their pixel files on a PC (the
-laserprinter is connected to a PC or for previewing purposes). In
-that case the pixel files must be downloaded from the host. We never
-use programs like Kermit for transferring the binary file but
-first convert it to hex form, load the file down as a text file and
-then convert it back. It is IMPORTANT to notice that pixel files in
-VAXes (say) are composed of 512 byte blocks. The pixel file itself
-is ended by the pixel_id, which is either 1001 (rasters are in word packed
-form) or 1002 (rasters are in byte packed form). Many programs running
-on PCs assume that the last 4 bytes of the pixel file really
-represent the pixel_id. Hence, the pixel files downloaded from the host
-should be CLEANed from garbage (the programs CONVERT and CLEAN are
-given for convenience and to fix the definition of what they should do).
- MetaFont also produces the file CMAPL10.TFM containing the
-metric information of the characters in the font. These are needed
-by TeX, and they can be downloaded as such (at least if you are
-using Micro-TeX or PCTeX).
-
- In order to use the mnemonics, the macros in APLSTYLE are
-needed. There are basically two ways of merging APL code. There are
-standard macros called VERBATIM, which enable the user to produce
-'typewriter-like' output. As APL is modelled on a typewriter style,
-too, it has been reasonable to extend VERBATIM to accept different
-typewriter-like fonts. The escape sequence \choosett enables you to
-choose the font you want to use. Thus, \choosett{tentt} swithces
-the standard font CMTT10 on, whereas \choosett{apl} chooses the font
-APL, defined in APLSTYLE by '\font\apl = cmapl10'. First, you can
-insert APL code into text lines. In this case you can call any
-APL symbol either by its 2-letter mnemonic (for example \BX produces the
-box symbol) if there is no symbol for it OR otherwise by its name
-surrounded by two @'s. (The @ character swithces into the current
-typewriter style.) Thus, @A_B@ produces 'A <-- B' in APL style, because
-'_' is the name of '<--' in Digital's mnemonics. Secondly, you can
-insert APL code in 'screenlike' mode. The code is to be delimited
-by the pair \begintt - \endtt. Example:
-
-\begintt
- @DL Z_ZNPLUS N;@BXIO % Here '@' replaces '\' as the escape
-[1] @BXIO_0 % character
-[2] Z_N@AB(@ION)@SO.+@ION
- @DL
-\endtt
-
-Please note that in this case the material between \begintt -- \endtt
-is considered by TeX as a vertical box that cannot be divided between
-pages. Thus, if you have a long APL function, it might produce
-a message of underfull vbox.
-
-