Compaq AlphaServer DS20E Reference Manual page 235

7.23.11 pk*0_soft_term
The pk*0_soft_term environment variable enables or disables SCSI
terminators for optional SCSI controllers. This environment variable
applies to systems that use the QLogic SCSI controller, though it does
not affect the onboard controller.
The QLogic ISP1020 SCSI controller implements the 16-bit wide SCSI bus. The
QLogic module has two terminators, one for the low eight bits and one for the
high eight bits.
To list the controllers on your system, enter the show device command. SCSI
controllers begin with the letters "pk" (for example, pka0). The third letter is the
adapter ID for the controller. Replace the asterisk with the adapter ID letter
when entering the set pk*0_soft_term command.
The value of pk*0_soft_term takes effect only after you reset the system by
pressing the Reset button or by issuing the init command.
The syntax is:
set pk*0_soft_term value
The options for value are:
off Disables termination of all 16 bits.
Enables low eight bits and disables high eight bits.
low
high Enables high eight bits and disables low eight bits.
Enables all 16 bits.
on (default)
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