CHAPTER
9
PERMANENT
COPIES
OF
YOUR
GRAPHS
PRINTING
If
you
have a dot matrix printer that
is
compatible
with
the Epson
FX80
(for example
the
Brother
HR-15
or the Canon
PW1080A)
you
can make printed copies
of
your graphs
immediately.
The
print command makes a printed copy
of
the
graph shown
on
the
screen.
Press
the
P
key
to
seled the print command. Before printing
Easel
reads the printer driver
from the
file
gprinLprt'
from the cartridge
in
Microdrive 1
Press the S
key
to
dump the screen
into
a Microdrive
file;
you
must type
in
the name
of the file
to
use followed by ENTER.
This
file
can
then
be subsequently processed
for example by a SuperBASIC program and sent
to
a printer not supported by
Easel.
Note that this
file
is
very large and normally
no
more
than
three can be stored on a
Microdrive cartridge.
Press
the
I
key
to
install
a different printer driver
Several
other printer drivers
are
supplied
on
the
Easel
crtridge, they
are
in
files
with
the
extension _Pr!o Some
of
these are colour
printers,
for
example
the
Integrex
132
and
the
Okimate
80.
Type
In
the
name
of
the
printer
driver
you
want and press ENTER.
The new printer driver
IS
not Installed permanently and
Easel
will
revert
to
the Epson
FX80
the next time
Easel
is
loaded.
The
default printer driver
is
contained
In
the
file
gprinLprt'
and
so
you
can make the Installation
of
a new printer permanent by simply
renaming the
files.
First
copy the original
'gprlnLprt'
to
another
file,
for example
FX80_prt'
and delete
the
original
file.
Then
copy the
file
containing
the
driver
you
require
to
the
Ii
Ie
'prinLprt:
Note that
the
original
Easel
cartridge
is
write protected
so
you
must
use
the
copy
you
made.
You
can
use
a baud
rate
different from the
Initial
9600 baud assumed by the
OL.
For
example,
if
you
wanted
to
set
4800 baud
start
Easel
by typing:
BAUD
4800
LRUN
mdv1
boot
instead of having
the
Easel
cartridge
in
Mlcrodrive 1 when
you
press
F1
or
F2.
Alternatively
you
could make
the
change
of
baud
rate
permanent by adding
an
extra
line
to
the
'boot' program.
First
load and renumber
the
program by typing:
LOAD
mdv1
boot
RENUM
10,10
Then
add,
for
example,
the
line:
5 BAUD 4800
Delete
the
old copy
of
the
program and
save
the
new
version
on
the
Easel
cartridge,
type:
SAVE mdv1
boot
Again
thiS
change must be made
to
a copy
of
the
Easel
cartridge.
PHOTOGRAPHY
The simplest, and
fastest.
way
of
obtaining a permanent copy
of
one of your graphs
is
to
take
a photograph
of
the
screen.
You
must.
however,
take
a little care
If
you
want
to
obtain good
results.
One of the most common causes
of
a poor photograph of a television screen
IS
using
too short
an
exposure
time.
The
picture
is
made up
of
625 separate
lines,
displayed
one after another
It
lakes a 25th
of
a second
to
display
all
the lines
in
the
picture and
if
you
use
an
exposure time
of
about this length, or
shorter,
the picture
will
be unevenly
lit.
It
IS
best
to
use
an
exposure time
of
around a quarter
of
a second - this means
that
you
must support the camera
on
a tripod. An average colour
film
(for prints or
transparenc'les)
with
a speed
of,
say,
100
ASA
will
need
an
aperture
of
around
F5.6.
Use a long focal length lens (about 100mm)
if
you
have
one,
as
this
will
reduce the
distortion caused by
the
curved surface
of
a
TV
screen.
18
12/84
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