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\title{Printing DVI Files on the APS}
\author{Arthur L. Samuel}

\begin{document}           % End of preamble and beginning of text.

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\tableofcontents
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The Autologic APS printer is a high resolution, 720 dots per inch, printer
that can be used to prepare a master copy for the subsequent photo-offset
production of book-quality output. The potential user should consider
using other easier to use printers whenever possible both because the APS
is extremely slow and frustratingly difficult to operate and because there
is considerable expense involved in its use. In any event, one should
always proof the desired output on another printer before trying to set it
on the APS.

This manual is an attempt to record the essential information that one
must have to use the APS.  The process of using the APS is complicated,
however, and so downright tricky that a new user would be well advised to
have some APS-knowledgable person help him the first few times rather than
to depend solely on this manual or on the APS-Micro 5 System Operator's
Manual.

The APS printer unit itself is located in the south-east corner of the
lower-level machine room in MJH (building 460) and it is accessed via
SCORE. The text output is recorded on photographic paper, requiring
developing and fixing, which is done using the special Developer Unit
that is in the TeX darkroom (ROOM 020E) off to the east of the machine
roon, entering a little to the north of the APS itself.

\section{Some General Considerations}

You should be aware of some of the unique features of the APS although the
entire device is much too complicated to be properly explained in this
brief report. 

But first, a warning: Never, I repeat, Never close the lid over the
transport mechanism of the printer unit until the Take-Up Cassette is in
place and properly threaded, for reasons that will be explained later.

\subsection{How the APS Handles Fonts}

The feature that is most apt to cause you trouble has to do with the way
the APS handles fonts. The APS gets it font information either from an
internal hard disk that is preloaded from floppy disks or by downloading
bit maps from SCORE. Neither method is entirely satisfactory.

\subsubsection{Handling Preloaded Fonts}

Preloading involves the complication of having to have the Autologic
Company transcribe our font information into the proprietary coding that
they use for the floppy disks.  So we must decide in advance as to which
fonts we might need and we may have to wait several months for Autologic
to get around to making the needed floppies.  We are currently waiting for
Autologic to supply us with floppies for all of the new CM fonts that are
normally needed by \TeX, but new fonts are always being created and the
task of updating the preloaded font supply is unending.
We do have about 20 Autologic fonts available and we can buy more from them,
but it is the task of putting our own fonts on the APS that is the problem.

The floppies that we have received from Autologic are kept in a box near
the printer unit (usually on the floor) and there is an accompanying list
of those fonts that are available. Unfortunately, this list is very
voluminous, containing, as it does, a complete listing of every character
of every font, but what you will want to know is contained in the header
of each page and these only for those fonts that carry a 5-digit
identifying number.

Each floppy holds about ten fonts. It takes a few minutes to load a
floppy.  There is also a limit to the number of fonts that can be
preloaded at the same time.  It is possible to query the machine and have
it list the fonts that are curently preloaded although what it reports are
the internal 5-digit identifying numbers used by the APS and not the names
that TeX uses.

The APS preloading scheme does have one redeeming feature, one needs to
load fonts in only four sizes, specifically in 80, 40, 20, and 10
point. The APS uses a reducing lens with the 80 point being used for sizes
from 41 point to 80 point and similarly for the other sizes.  One
interesting consequence is that the resolution for the intermediate sizes
of fonts is actually increased over the minimum values.  Contrast this
situation with that for most printers where fonts must be available,
albiet in the condensed GF format, for all of the actual sizes in which
they are to be used.

Preloaded fonts are identified within the machine by five digit numbers
where the last digit is either 1, 2, 3, or 4 indicating that the font size
is either 10, 20, 30 or 40 pt respectively.

The details as to how one preloads fonts from a floppy disk are discussed
in a later section.

\subsubsection{Downloading Complications}

Downloading fonts as they are needed is quite unsatisfactory because of
its effect on the overall printing time, which can easily be increased
from perhaps one minute per page to as much as fifteen minutes per page or
more.  The printing of reasonably large document can turn into an around
the clock operation.

This is not the whole story, however, since the fonts that you are
planning to use may not be available in the required bitmap format. If
they are not available, then you will have to go to quite a bit of
trouble.  If you are starting with MF files that are set up for, say, the
Imagen, you can replace the $\setminus$imagen line at the beginning of the
file with a $\setminus$aps line and generate a GF file for the required
resolution.  Having a GF file, you can then run the program GFTOAMF to
generate the required bitmap file that must then carry the extension
.1000amf and that must be included in your AMF.LST file (in alphabetical
order). In order to use your own AMF.LST list you must further redefine
APSFONTS from $<$tex.aps$>$ to reference your file area before running
DVIAPS.


\section{Preparing a DVI file for the APS}

As always, the first step in the process is to produce a DVI file by
running \TeX. This need not necessarily be done on SCORE but if it is done
on another system, SAIL, for example, a problem might later arise if a
font is used that is available on SAIL but that may not be available for
the APS.  On the other hand, again taking SAIL as an example, if one FTP's
the source file from SAIL one may have to UNDEK it to eliminate some SAIL
specific character codes that might have been used.

The successful production of a DVI file on SCORE is still no proof that
the DVI file will be acceptable to the APS. The next step is to convert
the DVI file into its APS form and this is done by running DVIAPS. In
fact, it might be wise to try running this program ahead of time before
going to the trouble of readying the APS itself. This will reveal the more
glaring font deficiencies that might be encountered but it will not
differentiate between fonts that are preloaded and those that will have
to be downloaded. If you are reading a recent version of this report, you
can refer to Appendix F for a list of the currently downloaded fonts.

\section{Running DVIAPS}

To run DVIAPS, one simply gives SCORE the command DVIAPS. You will be
prompted for the name of your DVI file snd the desired name for the output
file, which should carry a .APS extension. When prompted ``DVIoption", hit
the carriage return. Or, if you wish, type a question mark and you will be
told what options are available and what the default option is.  Finally,
an output message will report the length of your job.

\section{Readying the APS}

The first thing to do is to make sure that no one is using the machine.
It is easy enough to see if the machine is running by observing the the
display unit just above the four control buttons. It is not so easy to
tell if someone has either just started to use the machine or has had a
job finish (or abort) and has not as yet returned to retrieve the output.
While it is not particularly advisable to leave the APS running when
unattended, this {\em is\/} done, particularly on large jobs where the
print time can stretch into hours.

If the cover to the transport compartment is closed, then by convention,
the paper is set up in the operating state, and presumably, someone is in
process of doing something with the machine, so beware. On the other hand,
the last user may have just been trying to be nice and to ready the system
for the next user.

It is never a good idea to open the transport compartment when you find it
closed without making a careful survey as to the reason why the machine
was so left. As mentioned elsewhere, it is equally bad to close the lid
prematurely when you find it open.

If the cover to the transport compartment is open, then you can begin to
ready the system for your job.

First see if there is enough paper in the Supply Cassette to process your
job by reading the MEDIA SUPPLY-FT meter (just to the left of the four
push button controls on the main panel). If there is not enough paper,
then perhaps there is another loaded Supply Cassette somewhere near the
machine or perhaps in the dark room.  If there is not, you may be out of
luck, but see the section on Loading the Supply Cassette.

In readying the APS, one must not forget the Developer Unit which takes an
hour or so to warm up, so perhaps the next thing to do is to turn on the
timer and the main switch for this device, after checking for the
availability of enough chemicals for your job and the level of the
water. Also, don't forget to check and perhaps empty the overflow buckets
on the floor. See the section on Readying the Developer for details.

If the transport cover is up, the most likely state is for the paper to
have been left threaded through the print unit but to have been cut just
before entering the Take-Up Cassette. If the cut end of the paper is not
seen coming out of the print unit, then you will have to thread this unit
before proceeding. See the section on `Threading the Print Unit' later in
this report.

You will usually find that the Take-Up Cassette has not been properly
installed in its take-up position, so the next thing to do is to reinstall
this cassette.  Of course, you will want to make sure that the cassette
that you intend to use, is, indeed empty, and this can be judged by the
fact that there will be no lip of paper extending from the cassette and by
the fact that it has been left sitting on the typesetter.

\subsection{Installing the Take-Up Cassette}

It should be observed that the far end of the cassette contains a shaft
fitting that joins with the drive fitting to the rear, raising the
cassette up slightly when it engages and there is a swinging front socket
plate that slightly raises the front of the cassette when it is swung into
place and locked by a hand lever. If all of this does not operate easily,
then something is wrong with your positioning so do not try to force
things. If you are having trouble, refer to the pictures and text in the
APS-Micro 5 System Operator's Manual.

\subsection{Threading the Paper into the Take-Up Cassette}

Now open the Take-Up Cassette by releasing the two fasteners on its top and
raising the lid.  The wooden windup spindle can then be rotated by
operating the toggle switch on the vertical panel to the rear (pulling it
to the right) until the longitudinal slot in the spindle is vertical.
Enough print paper is pulled through the print unit to feed into the
cassette and through this slot with enough beyond to wrap, roughly, half
way around the spindle. You may want to rotate the spindle a quarter turn
(by the toggle switch) so that you can finish pulling the paper through
the slot.  The spindle is then rotated, again by using the toggle switch,
with the paper positioned with its front edge lined up with the pencil
mark on the spindle and with the end held so that it does slip back out of
the slot, until the paper has firmly bound itself to the spindle and is
feeding well.  The Take-Up Cassette lid is then closed and the fasteners
are clamped.

Great care should be taken during this threading operation, and indeed
during all paper threading operations, to be sure that the paper is never
wrinkled or fed unevenly or even stressed unevenly (by pulling on one edge
only) so that it might not continue to run true.

\subsection{Closing the Large Light-Proof Covers}

Now close the light proof covers by first closing the side panel (making
sure it latches) and then lowering the top. The lowering of this top will
cause the APS mechanism to apply tension on the supply reel in the Supply
Cassette to take up any slack in the system. You now can understand why
the lid should never be closed prematurely; it would cause the unsecured
paper to be wound completely back into the Supply Cassette thus requiring
a darkroom operation to retrieve the end of the paper, and, of course, a
complete re-threading of the entire device.

\section{Running the APS Typesetter}

When everything is ready, give the SCORE command ``do tex:zaps foo, where foo
is the name of your APS file without the extension.

Now go to the APS typesetter. If there are any error messages, as there may
well be, hit the INITIALIZE button.  When the message says READY, hit the
PROCEED button. If the message says IN PROGRESS, with a page number, your 
output is being typeset.

When the JOB DONE message appears, press the ADVANCE button. This causes
the paper to be moved along far enough to put the last part of your
typesetting well within the Take-Up Cassette. When the JOB DONE message
again appears, you can proceed to open the transport compartment and
remove the Take-Up Cassette for processing. Of course, if you have several
jobs to do, you can, and should, run them one after the other without
advancing the paper between jobs.


\section{Removing the Take-Up Cassette}

Now open the transport compartment.  You do this by raising the
light-proof cover (by its front edge, all the way up and make sure that it
is not going to fall). Now release the hinged side door by pressing the
button (just inside the door and near the bottom) while holding the door
and then lower the door carefully to avoid having it fall and strike the
side of the cabinet.

You can now cut the paper, just before it enters the Take-Up Cassette, by
using a knife and making use of the slot in the support structure over
which the paper passes. Do use the guide in making this cut so that a clip
can be squarely attached to the paper to draw it through the developer.

Do not open the cassette and do not allow the lip of paper to be either
pushed into the Take-Up Cassette or pulled out unduely.

Release the handle that locks the Take-Up Cassette in place, remove the
cassette and take it to the room housing the Developer. Remember to leave
the transport compartment open, both to show that the typesetter is no
longer in use, and, as noted earlier, to prevent the paper from being
drawn back into the Supply Cassette.

\section{Readying the Developer}

Remember, the Developer takes at least an hour to warm up.

Open the right side of the developer box and remove the large lid from the
equipment. First check the level of the water in the container that
surrounds the three chemical trays in which the three cylinders are
located.  Add some plain tap water if it is low.

Now check the levels of the chemicals in the three bottles above the
processor, and if necessary mix some new chemicals, as explained later, in
the Less Frequent Operations section of this manual. You should also check
the color of the developer in the tubing from the right bottle. If this is
not bright yellow then you may have to replace the spent developer, again
as explained later. It is also a good precaution to check the overflow
buckets on the floor to make sure that they are not getting dangerously
full.

Replace the lid and close up the right side of the box, at first without
having a Take-Up Cassette in the bin. Turn on the main switch (to the up
position) and set the timer for at least 2 hours (the timer is on the wall
to the right). Note that the timer's only function is to prevent the
heater from being left on by mistake.

\section{Running the Developer}

If at all possible, do get some one to demonstrate this process to you as
you are dealing with a Rube Goldberg piece of equipment that takes
carefull handling. However, it does work well when handled properly.

If the Developer is up to temperature, as indicated by the small red heater
light having gone off, open the right side of the device and position the
Take-Up Cassette in the bin, taking care that the cover will still close in
a light-tight manner.

Near the back wall you will find several foot-long rod-shaped
paper-holding clips that are used to draw the paper through the Developer.
One of these will be used to engage with catches that are spaced along the
two chains, which can be seen going around sprockets just to the left of
the installed Take-Up Cassette. This is the mechanism that is used to pull
the paper through the Developer until it has progressed far enough to be
propelled by a pair of rollers.

Attach one of these clips to the protruding lip of paper. You will note
that the projecting rod extending from one end of the clip is longer than
the rod extension at the other end.  The longer end goes to the front of
the machine (your left as you stand at the end to attach the clip). There
is plenty of unused paper at the end of the roll in the cassette, so you
can safely withdraw six or eight inches to make it easier to attach the
clip.

Make sure that this clip is attached firmly and squarely and positioned
properly so that it will pull evenly on the paper. Once started, there is
no easy way to correct for drift in the paper as it is processed and if it
drifts too far it can easily get entrap by the teeth at the end of the
rollers.  Care in starting the paper properly can save you a lot of
trouble later.

Position the clip in the drive mechanism, flip the ``Process'' switch on
(to the up position), and close the lid. Make sure that the lid fits
properly to be light proof. Adjust the speed to be in the vicinity of 2 on
the dial that is slightly to the right of the chemical bottles on the back
wall.

A loud click will signal the start of the process with the turning on of
the chemicals.  Now, check to see that the chemical flow rates are between
20\% and 30\%, as measured by the black ball shaped floats that can be
seen below the three bottles of chemicals and adjust the rates by the
black knobs.

A second loud click will signal that the clip and the leading edge of the
paper has traversed the mechanism and has come out of the left side of the
box.  After about a foot of paper has come out, remove the clip by tearing
off the useless chemically-marked portion of the paper. You will need to
watch the paper as it comes out of the processor and keep it rolled up to
prevent it from wrapping around one of the rollers inside the mechanism,
which, of course, would ruin your typesetting.

Also make sure that the paper continues to come out fairly straight from
the device. If the paper should drift too far toward one end of the
rollers in the processor, it can get tangled up in the mechanism.  If
necessary, you can turn off the lights, open up the machine, and realign
the paper in the dark,-- hardly a task for a novice to attempt.

Finally, don't forget to turn off all the switches when the processing
has been completed and to return the now-empty Take-Up Cassette to the
typesetter.

\section{Less Frequent Operations}

There are a number of operations that are not ordinarily required but that
do, of course, have to be done occasionally.

\subsection{Loading the Supply Cassette}

Loading a new roll of media is a darkroom operation and you should get
someone with darkroom experience to do this for you.  Even experienced
people have trouble in getting this operation done correctly, but if there
is no one around to help, here is how it is done.

In the first place, there are two widths of paper in common usage and you
want to make sure that you have a roll of the right width and that you
have the right Supply Cassette for the width that you intend to load.  If
new rolls of paper appear not to be available, get in touch with Lynn
Gotelli, who is in charge of ordering supplies.

Now read the Operator's Manual pages 3-4 through 3-6, paying particular
attention to the illustrations.

It will help if you go through the operations in the light the first time,
and, of course, in pantomime with respect to the actual unwrapping of the
roll of paper.  Note there are two different ways of going wrong, you can
put the roll of paper on the shaft wrongly and you can install the loaded
shaft into the box the wrong end to. Making both errors at the same time
will lead to having the paper coming out of the cassette correctly but you
will be unable to install the cassette properly on the printer unit.

Also note that there are two adjustments to be made, one having to do with
clamping the flange properly at one end of the roll and the second having
to do with the expansion of the shaft, by an axially operated screw
mechanism, to hold the roll firmly so that tension can be applied to the
paper to regulate it motion through the printer.

\subsection{Installing the Supply Cassette}

You will first have to remove the Print Unit's top cover (held down by two
thumb-screws). Now set the Supply Cassette on the left side of the
transport compartment with the exposed lip of paper facing the Print Unit.
It will be observed that the far end of the cassette contains a shaft
fitting that joins with a fitting to the rear, raising the cassette up
slightly when it engages and there is a swinging front socket plate that
slightly raises the front of the cassette when it is swung into place and
locked by a hand lever. If all of this does not operate easily, then
something is wrong with your positioning so do not try to force things. If
you are having trouble, refer to the pictures and text in the APS-Micro 5
System Operator's Manual.


\subsection{Threading the Print Unit}

If a new roll of paper has just been placed in the machine, you may have
to thread the paper through the Print Unit. This takes a bit of doing.
You will have to remove the Print-Unit's top cover (if you have not
already done so) to expose the rollers and there is a small cover on the
front of the Print Unit that can be removed to allow you to reach inside
and thread the unit according to the picture shown on the inside of the
main light-proof top cover and as explained in the Autologic Manual.  The
important thing is to make sure that the paper goes smoothly by each and
every roller and in the order shown. The extending shaft with a knob will
be found usefull in threading the paper around the first roller and in
providing slack for the rest of the threading operation.  Rotating this
knob counterclockwise advances the paper.

Make sure that the small covers are firmly closed when you are through
using them. You can then proceed to thread the paper into the Take-Up
Cassette, as described in a previous section.

\subsection{Mixing Chemicals for the Developer}

If any of the three large plastic bottles along the wall above the
developer appears to be empty, you will have to mix a new batch.  If the
needed chemicals are missing or nearing exhaustion, get in touch with Lynn
Gotelli, who is in charge of ordering supplies.

If, on the other hand, any trouble has been experience with the quality of
the development, if the typesetting coming out grey instead of black, or
if the equipment has not been used recently and the color of the developer
in the tubes on the right is orange instead of being bright yellow, then
it may be necessary to dispose of the old developer and replace it. See
the section on Replacing Spent Chemicals.

Don't try to be forehanded and attempt to replenish a chemical unless you
are willing to waste the amount that remains in the bottle, as there is no
easy way of removing a partially filled bottle and of saving the remaining
liquid.  The bottles do have tops that restrict the rate at which the
liquids pour out during the process of replacing the bottles but it is
much harder to remove a nearly empty bottle without spilling than it is to
place a full bottle into its holding container.

These three bottles, from right to left, hold:  1) the developer, 2) the
fixer, and 3) a mixture of fixer with hardener. Supplies of these
materials are contained in boxes on or near the table to your right as you
face the developer unit and the amounts of the raw materials per bottle of
the finished solutions are respectively: 1) 64 ounces of developer for the
bottle on the right, 2) 43 ounces of fixer for the middle bottle, and 3)
43 ounces of fixer plus 10 ounces of hardener.  for the bottle on the
left.  The bottles are filled the rest of the way with tap water.  If more
than one bottle needs refilling, do attend to one bottle at a time, with a
careful rinsing of the measuring pitcher between chemicals.

There is no sink and no source of water in the dark room so the
mixing process is a bit messy, to say the least, involving measuring out
the required amounts of the undiluted chemical into the calibrated
pitcher, putting this into the bottle and then of taking bottle and the
pitcher to the janitor's closet (if you have a key) or to a wash room and
then filling the bottle with water.  In the case for the fixer-hardener
mixture, this is a two stage process, measuring out the required amount of
fixer, putting this into the bottle, then nearly filling the bottle with
water, then measuring and adding the hardener, and then, finally, filling
the bottle the rest of the way with water and replacing the top.  Remember
to rinse the pitcher between using different chemicals, and when you are
through.

To reinstall a filled bottle, first loosen the top a half a turn. You will
note that there is a small hole in the top. Now invert the bottle above
its holding container and place it into its holding container, all in one
quick motion to prevent, or at least miminize, spillage.

\subsection{Replacing Spent Chemicals}

This is a messy operation, at best.  Normally, it is the developer that
has gone bad and we will so assume for the following explanation.

First remove the large lid to the developer and set it aside. You will
then see the belt drive mechanism that starts the paper through the
machine.  This mechanism is pivoted at its left end and you must lift it
at the right end and swing it up and out of the way. This both allows you
access to the developer tray and it disables the mechanical drive so that
you can refill the developer tray without running the rest of the
mechanism.

You will then see four large cylindrical drums that are driven by large
gears at the front and that dip into tanks filled with liquids.  When the
developer is running these drums revolve and bring a continuous supply of
liquid to the paper that rides over the drums, these liquids being, the
developer, to the far right, then the fixer, then the fixer and hardener
and finally some wash water.

You will be emptying the liquid from the tray and possibly some from the
tubing via an overflow vent into the overflow buckets that sit on the
floor, so perhaps the next thing to do is to make sure that there is
plenty of room in these buckets for the amount to be discarded.

To simplify the draining of the developer tray, you will need to remove
the drum from the tray.  This, you do, by first removing a restraining bar
that is just in front of the gears. This bar is held by three screws which
are to be loosened, but {\em not\/} removed, since the screw holes in the
bar are notched.  Remove the bar and set it aside. Now you can lift the
drum in question and prop it up over the tray (to collect the drip) by
leaning it against the back of the machine.

You can now use the baster tube that you will find in the dark room to
remove the spent developer from the tray, depositing it in the overflow
vent that you will see just to the left of the tray and between it and the
all-too-close tray of fixer which you must try not to contaminate. You may
want to tip the developer tray a bit to get most of the old developer out.

If the developer in the tubing is orange rather than being bright yellow
and particularly if there is any question as to the goodness of the
developer in the bottle itself, you may want to flush out the system with
some fresh developer from the bottle before refilling the tray. This, you
can do, by turning on the timer, the main switch and the process switch.
Turn the black knobs for the other two chemicals to prevent wasting these
and let the developer flow until the desired yellow color appears, when
you stop the flow by turning off both switches.  You can then reempty the
developer tray and proceed.

When you have finished disposing of the spent developer, you should
replace the drum in its slot and replace the restrainng bar and tighten
the screws, but do not yet lower the drive mechanism.  Remember to replace
the drum before refilling the tray since otherwise you would have to allow
for the volume displaced by the drum.

You can now refill the tray, by turning on the timer, and both the main
switch and the process switch. You should turn off the flow of the other
two chemicals (so that their flow indicators drop) and increase the flow
of the developer.  When the liquid in the tray has risen to its normal
level (just covering the metal feed tube on the right side in back), turn
off the process switch.

Finally, lower the drive mechanism to its normal position and replace the
large cover and the developer will be ready to use, although it may not
yet be up to temperature and you will, of course, have to readjust the
flow rates of the three chemicals when they are eventually turned on
during the development cycle.

\section{Preloading Fonts}

Occasionally, you may find that some of the fonts that you intend to use
are availably on floppy disks but for some reason are not currently
preloaded. You will then be faced with the task of finding the correct
floppies and of preloading the needed fonts.

1. You must first find the numbers of the fonts that you want to load and
then find the floppy or floppies that contain the desired fonts. This
falls into the `slightly tricky' category as it sometimes requires a
little guesswork.

There should be (but sometimes isn't) an official list of numbers and font
names on a computer printout in the box containing the floppies so one can
start by looking at that.  The file, $<$TEX.APS$>$AMF.LST, on SCORE
contains APS font numbers and the corresponding Stanford names but this
list may not be completely up-to-date. Remember that the fonts that you
will probably want have 5-digit numbers.  There are two versions of
amf.lst on SCORE. There is one in $<$tex.aps$>$amf.lst that only contains
computer modern names; the second one is in $<$csc$>$amf.lst and each font
in each size in each style has a different number but they are usually
consecutive.

Incidentally, when you are loading fonts, it is wise to consider load all
four sizes, not simply the one that you currently want, although you may
find that not all four sizes are available or that there may not be enough
space available to store all of them.


2. To load a font, press the Initialize button on the APS. Note that the
paper has to be loaded before the machine will let you do anything. When
the display says Ready, press 6 then 2 on the numeric keypad to the right
of the display. 6 is the number for Font Maintenance and 2 is the number
to load a font.

Now load the floppy. The disk slot is on the left on the front of the
machine.  The small rectangular black button can be pressed and the cover
will open. Exercise due care in handling the floppy disks, do not remove
them from their dust jackets until ready to insert them into the reading
slot, and handle them gently.  Remove the floppy from its dust jacket, and
slide the disk into the slot with the label side toward your left and with
the opening facing toward the back of the machine. If you hold the floppy
by the dust jacket in your left hand and put your right thumb on the label
in the process of withdrawing the floppy from its jacket, you will
automatically get it right.  Then close the slot cover.

3. You will then be asked a series of questions on the APS display. You
will press 1 to answer yes, 0 to answer no. The first question will be
whether you want to load all the fonts and the answer is usually no. It
will then ask if you want to load individual fonts and you answer yes. It
then starts cycling through the list of numbers of the fonts that are on
the disk. Answer no to each number until you get to the font(s) you want
to load then answer yes. If it says that the font is already loaded, it
may also ask if you want to load it anyway. Answer no. When you get to the
end of the list, the machine will display a message saying something like
'Sorting fonts'. At this point, remove the floppy. If you want to load
another floppy, press button 2,insert the next floppy and continue.

4. When you have finished, Remove the last floppy and close the cover
(keeps the dust out). Now press the C button, one or more times, until the
display says ``READY''. You can then begin typesetting.



\end{document}

\subsection{                  }
\section{                  }

cont

The APS system will automatically advance the paper when you start it
so as to skip over the exposed part of the paper before it begins
typesetting.

If the developer in the tubing is orange rather than bright yellow, then
perhaps the first thing to do is to flush out the tubing. Normally, the
developer in the bottle will still be good and it will require only a bit
of flushing to restore the desired yellow color. If, heaven forbid, the
color continues to remain orange then the remaining developer in the
bottle is also bad. To flush out the tubing, you turn on the main
switch amd the processor switch, turn the black knobs for the other two
supplies to prevent wasting these and perhaps increase the flow on the
developer, letting it run until the desired yellow color appears. You can
then simply turn off the two switches to stop to process.