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Page 10 Installation Instructions: SCSI Disk Drives

9.13-1/2" SCSI Drives in Series 90 Computers

Series 90 computers also require 5-1/4" mounting brackets in order to mount 3-1/2"

SCSI disk drives. For Series 90 AM-940, AM-980, and AM-990 computers, the drive is

installed in the bracket as previously described, but the addition of two plastic mounting

rails is required to be Series 90 compatible. These two plastic rails are held in place with

two screws as shown in Figure 5.

Plastic rails are not required for the AM-960 Series 90 computer. Once the drive is

installed in the 5-1/4" mounting frame, it attaches to the AM-960 peripheral mounting

area with four screws, two on each side.

MAC433

3 1/2" SCSI DISK DRIVE

MOUNTING POSITION

HDM-00106-00

MOUNTING RAIL - RIGHT

HDM-00106-01

MOUNTING RAIL - LEFT

Figure 5

Once the rails are installed, the drive slides into place inside your computer chassis.

After the drive is installed in the chassis, install the two metal clips used to keep the

drive from sliding forward from its mounting position.

Plug the 50-pin interface cable into the drive, making sure the red stripe on the cable

aligns with pin-1 on the drive’s connector. There is a sticker affixed to the top of the

drive’s HDA cover that points to the pin-1 location:

PDI-00436-20, Rev. A15

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Alpha Microsystems SCSI Spezifikationen Seite 14