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Enables or disables the rotational position sensing (RPS)
feature on a specified logical device. It requires a special firmware
upgrade CS-80 disk drives. Syntax | |
DISCRPS ldev { ,ENABLE [{,value,value}] ,DISABLE } Parameters | |
- ldev
The logical device number of the specified CS-80
disk drive. - ENABLE
Enables rotational position sensing on the device. - DISABLE
Disables rotational position sensing on the device. - value
Allows the time-to-target and window size to be
tuned, in hundreds of micro seconds. If you specify one value you
must specify both values. The first is interpreted as the time-to-target
value; the second is interpreted as the window size value. This
parameter only works in conjunction with ENABLE. (micro seconds)
Default time-to-target 90 (9000 )
window size 30 (3000 ) |
ONLY use this parameter if you have a clear understanding
of its meaning and implications. Operation Notes | |
The DISCRPS
command allows you to enable or disable the rotational position
sensing feature for CS-80 disk drives. With RPS enabled, the disk
drive signals its availability to do an I/O only when it is a small
rotational distance away from the target data. This improves system
performance when more than one drive is connected to the same HP-IB
channel. Use | |
This command may be issued from a session, job, program, or
in BREAK. Pressing Break has
no effect on this command. It may be executed only from the console
unless distributed to users with the ALLOW
or ASSOCIATE
commands. Example | |
To enable the RPS feature on logical device 1 and display
the status of the disk drive, enter: DISCRPS 1,ENABLE
SHOWDEV 1
LDEV AVAIL OWNERSHIP VOID DEN ASSOCIATION
1 DISC (RPS) 50 FILES |
To use the value parameter with
ENABLE to set
time-to-target and window size to the default values, enter: DISCRPS ldev,ENABLE,90,30 |
Related Information | |
- Commands
SHOWDEV - Manuals
CS/80 Instruction Set Programmers Manual
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