Instruction manual
Of
Disk
Drives
and
Terminal
R
••
lstor
• Identification
of
disk drives
A
maximum
of
four
disk drives
can
connect
to
the
computer
system, and every connected disk
drive requires drive number setting. This setting
can
be
achieved
by
the 4-gang switch labelled
"DR
IVE
SE
LECT"
which
is
present on the back
of
each
drive. Set
only
the
switch corresponding
to
a desired drive number
to
ON
as
shown below.
Use
care then
to
prevent the
same
drive number
from
being assigned
to
two
or
more drives in a drive system, otherwise the drive system would
malfunction.
Drive
Drive
Drive
Drive
1
2
S
4
~.1
2 s
41~
p.J
2 S
40
01
2 S
4.9
01
2 S
40
N~~~~
N[;]~~~N
N~~~[;]N
N[;]~~~N
Setting
of
the drive select switch
• Terminal resistor
The drive system requires
to
have
one
of
its component drives provided
with
a terminal resistor.
It
must
be
noted, however,
that
which drive should
be
provided
with
a terminal resistor depends
upon the number
of
connected drives. In principle, the drive remotest
from
the interface alone
needs a terminal resistor.
If
the drive system contains
two
or
more drives
with
a terminal resistor,
those drives get damaged when the system
is
put
in operation.
Pay
due
attention
to
this regard.
When attaching a terminal resistor,
follow
the procedure given below.
(1) Unscrew the panel under the indication
"TERMINAL
RESISTOR" which
is
secured
with
two
screws.
You
will
find
a socket then.
(2)
Mount
a supplied terminal resistor on the socket. This resistor, having no
polarity,
can
be
mounted in any orientation.
(3) Make sure the resistor
has
correctly
been mounted, then replace and screw the panel.
TERMINAL
RESISTOR@
DRIVE
SELECT
~
0(
·······
·····\A
=
.'
•••••••••••
) "'" IN
'-
____
--/
o (::
.'.
" .... -·.·.·.·::)OOUT
FG
POWER
OFF
ON
I
se
I
@
o
Mounting
of
the terminal resistor
3
Terminal
resistor