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IMPORTANT
PLEASE READ
BEFORE
SWITCHING
ON
THE
PC1
640
SYSTEM
UNIT
CAN
BE
USED
WITH EITHER
A
PC-MD
MONOCHROME
DISPLAY,
A
PC-
CD
COLOUR
DISPLAY
OR
A PC-ECD
ENHANCED COLOUR
DISPLAY.
THERE
IS
A
1
POSITION
DIP
SWITCH
ATTHE BACK OF THE SYSTEM
UNITTHAT
MUST
BE
ADJUSTED FOR USE
WITH EITHER
OF
THE
COLOUR
DISPLAYS.
PLEASE
LOOK
AT
THE FOLLOWING CHART
AND
ADJUST THE
DIP
SWITCHES ACCORDING TO THE
DISPLAY
YOU
HAVE FOR
SERVICE.
1
2
3
DIP
SWITCHES
4
5
6
7
8
9
10
PC-MD
OFF
OFF
ON
OFF
ON
ON
ON
OFF
OFF
OFF
PC-CD
OFF
OFF
OFF
ON
ON
ON
ON
OFF
OFF
OFF
PC-ECD
OFF
ON
ON
OFF
OFF
ON
ON
ON
OFF
OFF
DISPLAY
SELECTOR SWITCH
SETTINGS
The
display selector switch settings
determine
how
the
IGA
(Internal
Graphics
Adaptor)
is
configured
J
when
the
machine
is
powered
on
or
reset.
These
switch settings
can be
overridden by
software.
In
^*
particular
by the
DISPLAY command
which
is
installed
on
all
Hard
Disc
PCs and
Disc
2
of
your system
discs.
Many
of
the
modes
below have been
given a
name, unique
to
the
Amstrad PC1
640,
in
order
to
easily
distinguish
between
them.
These
names
are
accepted
by the
DISPLAY command,
which
will
switch
to
the
requested mode,
or
print
an
error
message
if
it
is
not possible or advisable.
Mode
Sw1
Sw2
Sw3
Sw4
Sw5
display Description
MDA
or
Hercules Diag
(1)
EGA
monochrome
CGA
compatible
40 column
CGA
compatible
80 column
(2)
EGA
compatible
40 column
CDA
compatible
80 column
EGA
200
lines
EGA
350
lines
(3)
MDTEXT
off
off
on
off
on
MD
MDMONO
off
off
on
off
off
MD
on
off
off
on
on
CD
CDMONO
off
off
off
on
on
CD
on
off
off
on
off
CD
CDCOLOR
off
off
off
on
off
CD
ECD200
on
on
on
off
off
ECD
ECD350
off
on
on
off
off
ECD
all
modes:
SW6
SW7
SW£
X
X
on -
off-
PC
ECD
PC
MD
or
PC
CD
SW9
off
SW10
off
(1)
Recommended
setting
for
PC
MD
(2)
Recommended
setting
for
PC
CD
(3)
Recommended
setting
for
PC
ECD
x
=
don't
care
19
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