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1-12 Installation and Service Guide
Data and Power Flow: SCSI Attached Disk Drives – Models 380, 390,
39H
Note: If external devices or cables are not connected to the external SCSI-2 connector, the
external SCSI-2 connector does not require a terminator.
Rear of
System Unit
Ethernet
Riser
Card
Tablet (T)
Keyboard (K)
Mouse (M)
Power
Supply
Diskette
Battery
Reset
Button
External
SCSI-2
Four I/O
Slots
Parallel Port
Key Mode
Switch
Front
Fan
Rear
Fan
3-Digit
Display
Serial Port
Extender
Cable
Memory
Cards
CPU Card
Media
Drive
Media
Drive
Disk
Drive
Disk
Drive
Internal SCSI Cable
Voltage Regulator
Card on Model 39H
Memory/CPU for
Model 39H
Optional
Disk
Drive
Fan