DEC AlphaServer 1000A Owner's Manual page 145

1. One end of a 50-pin internal SCSI cable (17-04233-01) connects to its system
board connector.
2. The CDROM connector on the SCSI cable connects to the rear of the CDROM
drive.
3. The remainder of the cable passes over the system board and connects to the rear
of the tape drive, if one is installed, and this bus (A) is terminated by an external
SCSI terminator (12-41667-05) at the rear of the system unit. (See Figure 6-6.)
4. One end of a 68-pin internal SCSI cable (17-04022-01) connects to a SCSI
option card controller, and the remainder of the cable passes beneath the system
board and connects to the 68-pin connector (J11) on the backplane.
5. One end of a 68-pin internal SCSI cable (17-04019-02) connects to the 68-pin
connector (J10) at the top of the backplane, runs beneath the system board, and
out to one of the two larger cutout slots at the rear of the system unit. An
external SCSI terminator (12-41667-04) attached to this SCSI cable terminates
the B bus.
6. One end of a 68-pin internal SCSI cable (17-04022-01) connects to a second
SCSI option card controller, and the remainder of the cable passes beneath the
system board and connects to the 68-pin connector (J17) on the bottom of the
backplane.
7. An active internal SCSI terminator (12-45490-01) attached to the 68-pin
connector (J16) terminates the C bus, as shown in Figure 6-10.
Or, as an alternative (not shown), one end of a 68-pin internal SCSI cable (17-
04019-02) connects to the 68-pin connector (J16) and out to one of the two
larger cutout slots at the rear of the system unit, and an external SCSI terminator
(12-41667-04) attached to the cable terminates the C bus.
8. All three jumpers in the J3 set of jumper pins on the backplane are removed
(disabled).
AlphaServer 1000A Owner's Guide Configuring 6-37