AT&T Map/40, Manual

Page: 42 / 60

3-10
Upgrading Circuit Cards
The SCSI Host Adapter Circuit Card
The Small Computer System Interface (SCSI) Host Adapter controller card con-
trols the hard disk drives, the floppy disk drive, the cartridge tape drive, as well as
the SCSI Bus LED front chassis panel indicators for these drives. In this upgrade
procedure, you will be replacing your system’s existing hard disk controller card
(and possibly a cartridge tape controller card) with the SCSI host adapter control-
ler card.
!
WARNING :
Observe proper electrostatic discharge precautions when handling computer
components. Wear a ground wrist strap against your bare skin and connect
to an earth ground.
To install the SCSI circuit card, complete the following:
■
Verify jumpers
■
Verify switch settings
■
Verify that the 3 terminating resistor SIPs are installed. The first and last
peripheral devices on the SCSI cable must have terminating resistors
installed. All other SCSI devices must have terminators removed.
■
Refer to ‘‘General Steps for Circuit Card Installation’’, found in this chapter
to install the SCSI card.
■
Connect cables
Refer to the figure on the next page for location of jumpers and switches.