The macintosh's external scsi connector, The macintosh's internal scsi connector, The macintosh’s external scsi connector – Nikon LS-10 Installation Guide for Macintosh User Manual
Page 30: The macintosh’s internal scsi connector
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Chapter 3
The SCSI Interface
The Macintosh's External SCSI Connector
The SCSI connector for external SCSI devices on the Macintosh, which is a 25-
pin DB25-type connector, is found on the Macintosh’s rear panel. This connector is
indicated by the Macintosh’s SCSI symbol, shown in Figure 3.7.
Back of Macintosh
Computer--------------
SCSI Symbol —
25-pin DB25
SCSI Connector •
o
- (R^^ooooooooooooo/ff^
^ \00000000000Q/ ^
Figure 3.7
Simplified rear view of the Macintosh computer’s SCSI connector.
The 50-pin Centronics connector, the type used on Coolscan, is the most com
mon connector used for external SCSI devices on the Macintosh. Thisis why a
25-pin
DB25 to 50-pin Centronics
cable has been provided with your Coolscan. The 25-pin
end of the cable is connected to the SCSI connector on the Macintosh, and the 50-pin
end to Coolscan. Examples of these connectors are shown in Figure 3.8.
(a) 25-pin DB25
SCSI Connector -
ooooooooooooo
pooooooooooo.
(b) 50-pin Centronics
SCSI Connector —
Figure 3.8
Typical SCSI connectors, (a) DB25 connector, (b) 50-pin Centronics connector.
Please proceed to the section “The SCSI Chain.”
The Macintosh's Internal SCSI Connector
The Macintosh’s SCSI connector for internal SCSI devices, a 50-pin flat connec
tor, resides inside the Macintosh on the motherboard (the main circuit board inside the
Macintosh). This is shown in Figure 3.9. Please note that Coolscan will not operate
properly unless it is connected to the main Macintosh SCSI port. Do «of connect
Coolscan to any SCSI
accelerator card
that may be installed.
Nikon
Coolscan Installation Guide for Macintosh
Page 23