IBM System/370 145 Operating Procedures Manual page 26

FEATURES (INDICATORS and SWITCHES)
Integrated Storage Control (lSC)
• This feature supports a one-or-two channel application
(with or without the two-channel switch special feature).
If you have a single channel application, your ISC feature
has one (1) function
~witch
(I/O INTERFACE A). The
I/O INTERFACE Band MULTITAG switches are non-
functional. If you have a two-channel application, your
ISC feature has the two-channel-switch special feature,
and all feature associated switches are functional.
IMPL
[;]
[!] [!]
C
0
K
OFF
0" Off
ISC (Two-channel switch not installed)
I/O INTERFACE A (switch)
ON: This position makes the ISC Feature available to
the program.
OFF:
OFF:
(lSC not in use) This position removes the ISC
from use by the program.
(lSC in use) This position removes the ISC from
use by the program only after the system has
entered a manual state (MAN indicator on).
I/O INTFS DSBLD (indicator)
ON: Indicates that the ISC feature is not available
to
the
program. (I/O INTERFACE A switch is OFF.)
OFF: Indicates that the ISC feature is available to the
program.
B
§~
~D
c::J D§J
0D
o
BE]
8
~~5050~~~~~OOO~O ~~ooo~o~6~00000000
5e~~6~go6~~o~c~ ~~~~~~oo~0666~666
§]
B ElG
I/O INTFS DSBLD (indicator)
ON: Indicates that the ISC feature is not available to any
system program. (Both I/O INTERFACE A and B
switches are
0
F F. )
OFF: Indicates that the ISC feature is available to the
I
Ise
(Two-channel switch installed) system(s) programs.
I/O INTERFACE A and B (switches)
ON: This position of switch A or B makes the ISC
feature available to the system program using that
particular channel interface.
OFF: (lSC not in use) This position of switch A or B
removes the ISC feature from use by any system
program using that particular channel interface.
OFF: (lSC in use) This position of switch A or B removes
the ISC feature from use by the system program
using that respective interface only after that system
has entered a manual state (MAN indicator on).
MUL TITAG (non-functional without two-channel switch)
• Determines how the disk drive will generate device-end.
ON:
A drive is available after a channel clears the device-end
generated by the drive.
OFF: A drive is available to either channel after one
of the channels clears device-end generated
by the drive.
IMPLCHECK
Indicates an unsuccessful tMPL operation in the ISC
feature.
System Control Panel Indicators, Switches, and Keys 25