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If you need to save on disk space, you can try loading only those
fonts which are referred to in plain.tex at the size needed for your
device.  In this note, we attempt to identify these files.

In any case, you will need all of the .tfm files.  TeX uses these to
determine how wide the characters are.

If you are planning to print on a device with a resolution of 200
pixels/inch (e.g., Versatec, Varian) at normal size (magnification 1.0) you
will need all of the .1000pxl files, amr7.2074pxl, amtt10.1440pxl, and
amssbx10.2074pxl.  These fonts will be found in ../pxlfonts.

If you are planning to print on a device with a resolution of 200
pixels/inch magnified to 1.315 (recommended for Versatec, Varians,
etc.), you will need all of the .1315pxl files, amr7.2726pxl,
amtt10.1893pxl, and amssbx10.1893pxl.  These fonts will be found in
../pxlfonts.

If you are planning to print on a device with a resolution of 240
pixels/inch (e.g., the Symbolics Laser Printer, the Imagen Laser
Printer), you will need all of the .1200pxl files, amr7.2488pxl,
amtt10.1728pxl, and amssbx10.1728pxl.  These fonts will be found in
../pxlfonts.

If you are planning to print on a device with a resolution of 300
pixels/inch (e.g., those based on the Xerox 2700), you will need all
of the .1500pxl files, amr7.3110pxl, amtt10.2160pxl, and
amssbx10.2160pxl.  These fonts will be found in ../pxl300.


If you are planning to print on a device with a resolution of 480
pixels/inch, you will need all of the .2400pxl files, amr7.4977pxl,
amtt10.3456pxl, and amssbx10.3456pxl.  These fonts will be found in
../pxl480.

Here's the entire list of fonts which might be needed at one or
another of these magnifications (excepting the 480 dpi sizes).

Fonts which are considered to be part of plain:
font name		1.0 (200 dpi)	1.2 (240 dpi)	1.315		1.5 (300 dpi)

% roman text
\font\tenrm=amr10	1000pxl		1200pxl		1315pxl		1500pxl
\font\sevenrm=amr7	1000pxl		1200pxl		1315pxl		1500pxl
\font\fiverm=amr5	1000pxl		1200pxl		1315pxl		1500pxl

% math italic
\font\teni=ammi10	1000pxl		1200pxl		1315pxl		1500pxl
\font\seveni=ammi7	1000pxl		1200pxl		1315pxl		1500pxl
\font\fivei=ammi5	1000pxl		1200pxl		1315pxl		1500pxl

% math symbols
\font\tensy=amsy10	1000pxl		1200pxl		1315pxl		1500pxl
\font\sevensy=amsy7	1000pxl		1200pxl		1315pxl		1500pxl
\font\fivesy=amsy5	1000pxl		1200pxl		1315pxl		1500pxl

% math extension
\font\tenex=amex10	1000pxl		1200pxl		1315pxl		1500pxl

% boldface extended
\font\tenbf=ambx10	1000pxl		1200pxl		1315pxl		1500pxl
\font\sevenbf=ambx7	1000pxl		1200pxl		1315pxl		1500pxl
\font\fivebf=ambx5	1000pxl		1200pxl		1315pxl		1500pxl

% typewriter
\font\tentt=amtt10	1000pxl		1200pxl		1315pxl		1500pxl

% slanted roman
\font\tensl=amsl10	1000pxl		1200pxl		1315pxl		1500pxl

% text italic
\font\tenit=amti10	1000pxl		1200pxl		1315pxl		1500pxl


Preloaded fonts (not part of plain but defined in plain.tex)
font name		1.0 (200 dpi)	1.2 (240 dpi)	1.315		1.5 (300 dpi)

% roman text
\font\preloaded=amr9	1000pxl		1200pxl		1315pxl		1500pxl
\font\preloaded=amr8	1000pxl		1200pxl		1315pxl		1500pxl
\font\preloaded=amr7 scaled \magstep4 % for titles
			2074pxl		2488pxl		2726pxl		3110pxl
\font\preloaded=amr6	1000pxl		1200pxl		1315pxl		1500pxl

% math italic
\font\preloaded=ammi9	1000pxl		1200pxl		1315pxl		1500pxl
\font\preloaded=ammi8	1000pxl		1200pxl		1315pxl		1500pxl
\font\preloaded=ammi6	1000pxl		1200pxl		1315pxl		1500pxl

% math symbols
\font\preloaded=amsy9	1000pxl		1200pxl		1315pxl		1500pxl
\font\preloaded=amsy8	1000pxl		1200pxl		1315pxl		1500pxl
\font\preloaded=amsy6	1000pxl		1200pxl		1315pxl		1500pxl

% sans serif
\font\preloaded=amss10	1000pxl		1200pxl		1315pxl		1500pxl
\font\preloaded=amssq8	1000pxl		1200pxl		1315pxl		1500pxl

% sans serif italic
\font\preloaded=amssi10	1000pxl		1200pxl		1315pxl		1500pxl
\font\preloaded=amssqi8	1000pxl		1200pxl		1315pxl		1500pxl

% boldface extended
\font\preloaded=ambx9	1000pxl		1200pxl		1315pxl		1500pxl
\font\preloaded=ambx8	1000pxl		1200pxl		1315pxl		1500pxl
\font\preloaded=ambx6	1000pxl		1200pxl		1315pxl		1500pxl

% typewriter
\font\preloaded=amtt10 scaled \magstep2
			1440pxl		1728pxl		1893pxl		2160pxl
\font\preloaded=amtt9	1000pxl		1200pxl		1315pxl		1500pxl
\font\preloaded=amtt8	1000pxl		1200pxl		1315pxl		1500pxl

% slanted typewriter
\font\preloaded=amsltt10
			1000pxl		1200pxl		1315pxl		1500pxl

% slanted roman
\font\preloaded=amsl9	1000pxl		1200pxl		1315pxl		1500pxl
\font\preloaded=amsl8	1000pxl		1200pxl		1315pxl		1500pxl

% text italic
\font\preloaded=amti9	1000pxl		1200pxl		1315pxl		1500pxl
\font\preloaded=amti8	1000pxl		1200pxl		1315pxl		1500pxl
\font\preloaded=amti7	1000pxl		1200pxl		1315pxl		1500pxl

% unslanted text italic
\font\preloaded=amu10	1000pxl		1200pxl		1315pxl		1500pxl

% bold math italic
\font\preloaded=ambi10	1000pxl		1200pxl		1315pxl		1500pxl

% bold math symbols
\font\preloaded=ambsy10	1000pxl		1200pxl		1315pxl		1500pxl

% caps and small caps
\font\preloaded=amcsc10	1000pxl		1200pxl		1315pxl		1500pxl

% sans serif bold extended
\font\preloaded=amssbx10
			1000pxl		1200pxl		1315pxl		1500pxl
\font\preloaded=amssbx10 scaled \magstep2
			1440pxl		1728pxl		1893pxl		2160pxl

% Dunhill style
\font\preloaded=amdunh10
			1000pxl		1200pxl		1315pxl		1500pxl

% METAFONT logo and dragon curve and special symbols
% Only the .tfm file for this font is included in the Unix distribution.
\font\preloaded=manfnt	1000pxl		1200pxl		1315pxl		1500pxl


You may have noticed that some of the the sizes given above are of rather
strange denominations.  The reason for this is that they are defined for use
with the quanity called "magsteps," originally introduced in version 0.99 of
TeX82.  Magsteps are defined as factors of 1.2---in other words, each full
magstep increases the character size by by a factor of 1.2, and a
"magstephalf" increases it by the square root of 1.2, which, it turns out,
is very close to a factor of 1.1.  This results in some rather funny looking
fractional point-sizes in scaled typefaces, but you will find that saying
"\font\eighteenrm=amr9 scaled \magstep4" is just as good as saying
"\font\eighteenrm=amr9 at 18pt" even though the actual multiplication factor
is 2.074, rather than a simple 2.0.  The reason that the apparent oddity of
magsteps was created is that it makes consistent global scalings easier.
You don't need to make arbitrary changes in a font family to double the size
of your output (always assuming that the font sizes you are asking for are
available on your system.)  Perhaps the following table will make things a
bit clearer.  It shows the PXL file magnifications that will produce the
specified magstep (magstep 0 is the same as a factor of 1.0, i.e., true
size).  PXL magnifications are expressed as 1000 times the actual
magnification factor and are based on a resolution of 200 pixels/inch.

     \magstep value    0  half   1    2    3    4 (\magstep4 gives you about 2.0
                                                   magnification in each case)
From a base of
200 pixels/inch      1000 1095 1200 1440 1728 2074 (true size is *.1000pxl)

From a base of 
240 pixels/inch      1200 1315 1440 1728 2074 2488 (true size is *.1200pxl)
 
From a base of 
300 pixels/inch      1500 1643 1800 2160 2592 3110 (true size is *.1500pxl) 
 (if you instead decided that starting from a base of 288 pixels/inch was
 close enough to the desired 300 pixels/inch, you would then start with
 1440pxl and would use many of the same font magnifications as those already
 shown:              1440 1578 1728 2074 2488 2986 (``true'' size *.1440pxl)

From a base of       
480 pixels/inch      2488 2726 2986 3583 4300 5160 (true size is *.2488pxl)
 
From a base of       
600 pixels/inch      2986 3271 3583 4300 5160 6192 (true size is *.2986pxl)
(actually 597 pixels/inch)
 
From a base of
263 pixels/inch      1315 1440 1577 1893 2272 2726 (true size is *.1315PXL)
 (This size is useful on Versatecs which print at 200 pixels/inch.  It
 produces output that is about 1.3 times larger than actual size.  When this
 output is reduced to 77%, a commonly available reduction on many
 photocopiers, the quality of the result is much improved.)

Effective output     10pt 11pt 12pt 14pt 17pt 20pt 
size of AMR10         

The only really unsatisfactory series is the 300 pixel series, and nothing
seems to work very well for that.  The 200 pixel series at 1.3 magnification
uses some odd sizes too, but that seems reasonable in view of the peculiar
magnification value, magstep 1.5, (which is governed by the common
availability of 77% reduction on Kodak copiers, etc.) Most of the other
series seem to fit together quite nicely.
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