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Chapter 3
The SCSI Interface
Make sure
not
to confuse the printer port connectors on
the
computer with the
25-pin DB25 SCSI connector, should this type of connector be used.
(a)
25-pin D825
SCSI Connector
(b)
50-pin Centro
SCSI Connector
nics
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Figure
3.7
Typical SCSI connectors on
[he rear of [he
computer. (a)
DB25
connector.
(b)
50-pin
Centronics connector.
The second type of SCSI connector found on PCs is the 50-pin Centronics con-
nector, which is commonly
used
for external SCSI connections. This connector
is
shown in Figure 3.7b.
If
your PC already has installed a SCSI controller card with a 50-
pin
Centronics external connector,
you
will not
be
able to
use the
SCSI cable provided
with Coolscan. Instead, you will need a 50-pin Centronics to 50-pin Centronics SCSI
cable.
Please pro,eed to the section
"The
SCSI Chain."
The PC's Internal SCSI Connector
The SCSI
connector
for internal SCSI devices on the PC is a 50-pin flat connec-
tor residing on the SCSI controller card. Please note that Cools can will not operate
properly
unless
it is connected to the SCSI controller card. Do not connect Coolscan to
any SCSI accelerator
card
that may be installed.
Connecting to the Internal SCSI Connector
Again, the SCSI connector on
the
PC's SCSI controller card is a 50-pin flat con-
nector
as shown
in Figure
3.8.
Note the position of pin 1 and the
safety
key.
The safety
key provides a level of protection
against
inserting the improperly.
Nlkon
CooLscan
Installation
Guide for
Windows
Page
23
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