Power Connector
---------------
The power for the drive is provided through a 4-pin male polarized
connector. Pin 1 is the rightmost pin when viewing the connector with
drive top cover up.
SCSI Connector
--------------
The SCSI connector is a 50-pin, shrouded (4-sided), male, keyed, right-
angle connector. Pin 1 is the rightmost pin of the upper row when viewing
the connector with drive top cover up (key slot up).
Termination
-----------
Removable termination resistor packs with standard SCSI 220/330
termination resistors. The packs are removable without having to remove
the board. The drive provides termination power to the TERMPWR line (pin
26) of the SCSI bus through a diode and provides a 1.5 amp current-limiting
function.
Device Select Connector
-----------------------
The device select connector is a 6-pin male connector located behind the
power connector along the drive side. Nominal pin spacing is 0.100
inches.
LED Connector
-------------
The LED connector is a 2-pin, right-angle, un-shrouded, nonpolarized male
header to connect with the LED cable assembly. Nominal pin spacing is
0.100 inches. It is located on the opposite end of the drive from the SCSI
connector.
Connector J6
------------
Connector J6 is an 8-pin male connector located on the side of the drive
away from the SCSI connector. Pin 1 is the bottom pin farthest from the
SCSI connector end.
Pin 1 - Not Jumpered (Factory use only)
Pin 2 - Not Jumpered (Motor start option)
Pin 3 - Not Jumpered (Delayed Motor start option)
Pin 4 - Not Jumpered (Write-protect option)
Pin 5 - Jumper Installed (Parity checking and error reporting)
Pin 6 - Not Jumpered (Reserved for later use)
Pin 7 - Jumpered in a Macintosh Quadra 900/950
(Termination Power is supplied to the SCSI bus.)
Pin 8 - Jumpered in a Macintosh Quadra 700
(Termination is supplied to the drive terminators.)
Note
----
Pins 7 and 8 jumpered at the same time is allowed.