DEC AlphaServer 1000A Owner's Manual page 142

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.
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. A second 68-pin internal SCSI cable (17-04019-02) connects to the 68-pin
connector (J10) at the top of the backplane, and runs 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. A 68-pin internal SCSI cable (17-04022-02) connects to the 68-pin wide SCSI
connector on the system board, and the remainder of the cable passes beneath the
system board and connects to the 68-pin connector (J17) at the bottom of the
backplane.
7. An internal terminator (12-45490-01) attached to the 68-pin connector (J16)
terminates the B bus.
8. All three jumpers in the J3 set of jumper pins on the backplane are removed
(disabled).
6-34 Configuring AlphaServer 1000A Owner's Guide