16 Bit SCSI Host Adapter  (250-4161)   Installation     Faxback Doc. # 5072

HARDWARE INSTALLATION

Now that the host adapter is configured correctly for your Tandy 3000/4000
computer system the hardware installation procedure can begin. To install the
host adapter you should follow the installation steps in order.

1. Turn OFF the power to the computer system.

2. Remove the system cover by removing the three case screws on the rear of
   the machine and carefully sliding the case forward.

3. Install the supplied 50 pin ribbon cable to the host adapter. This cable
   must be oriented correctly. Pin 1 of the SCSI header is located at the top  
   and is designated by a 1. After locating pin 1 on the host adapter and on
   the SCSI cable, carefully insert the connector located at the end of the
   long end of the cable in to the host adapter connector. After ensuring that
   all pins are lined up and that the pin 1 orientation is correct, firmly
   seat the connector to the board.

4. After installing the SCSI cable, the host adapter can be installed in the
   computer. It is recommended that the host adapter be installed in the slot
   closest to the power supply to simplify cabling.

5. The cable should be routed forward a few inches and then folded to go up
   and over any adjacent boards between the host adapter and the drive bays.
   Please refer to the peripheral's installation instructions to ensure proper
   pin 1 orientation on the SCSI peripherals.

NOTE: Pin 1 SCSI cable orientation must be consistent throughout the system.
This may require several twists in the 50 pin SCSI cable.

6. After installing the host adapter and cabling to the SCSI peripherals,
   carefully slide the case back on to the computer and secure with the three
   case screws.


(SMM/jlc-03/27/94)