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COLOUR
PARAMETERS
PAPER
2 Ired]
PAPER
2,4
[red/green chequerboardJ
PAPER
2,4,1
[red/green horizontal
strlpesJ
The colour
will
not
be visible until something
else
IS
done, for example, the screen
is
cleared by typing
CLS.
INK
INK followed
by
one,
two or three numbers specifies the colour for printing characters,
lines or other graphics. The colour and stipple effects
are
the same
as
for PAPER.
For
example:
INK
2 [red ink]
INK
2,4
[red/green chequerboard ink
3J
INK
2,4,1
Ired/green horizontal striped inkl
The ink
Will
be changed for
all
subsequent output
CLS
CLS means clear the window
to
the current paper colour -
like
a teacher cleaning
a blackboard, except that
it
IS
electronic and multi-coloured.
FLASHING
You
can make the ink colour
flash
in
mode 8
only.
To
turn
flash
on you might type:
FLASH 1
and
to
turn
It
off:
FLASH 0
Allowing flashing characters
to
overlap can produce alarming
results.
FILES
You
will
have used Microdrives for storing programs and
you
Will
have used the
commands LOAD and SAVE Cartridges can be used for storing data
as
well
as
programs. The word
file
usually means a sequence
of
data records, a record being
some
set
of
related information such as
name,
address and telephone number
Two
of
the most widely used types
of
file
are serial and direct access
files.
Items
In
a
serial
file
are
usually read
in
sequence starting
with
the first
If
you want the fiftieth record
you
have
to
read the
first
forty-nine
in
order
to
find
it
On the other hand the fiftieth record
in
a direct access
file
can be found quickly because
the
system does not need
to
work
through the earlier records
to
get
it
Pop music
on
a cassette
is
like
a serial
file
but eight
pieces on a long playing record form a direct access
file,
You
can move the pick up
arm directly onto any
of
the eight tracks.
The simplest possible type
of
file
is
just a sequence
of
numbers.
To
illustrate the idea
we
will
place the numbers 1
to
100
in
a
file
called numbers.
However,
the complete
file
name
is
made up
of
two
parts:
device name
appended information
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