IBM 2790, Руководство пользователя, Страница: 45 / 88

Format of Request
Valid Sources of Request
and Destination to which
Requested from CPU
in Control Message
Requested from 2715 Panel
Requested from 2740 Keyboard
Positive Response
___ J „ 071 £
Control Request
Response is Sent-
C - CPU
P - 2715 Panel
T - 2740 Terminal
Transaction
Header
Control
Byte
Data Field
of Message
Transaction
Control Byte:
Data/Address
Switches (Hex) Data Bytes:
Data/Address
Switches
(Hex)
Transaction
Control Byte
Entered from
Keyboard
Data Bytes
Entered from
Keyboard:
L/Idpiuycu Ull
JLf
1
Display Registers
(Hex)
CPU 2715 2740
(Hex) (Char)
Content
Length 0-3
4-7
8-15 Content Length
Bypass Area Station C ,T C ,P
C l
A AS address
1 C 1
AS address
-
- -
C 1 F
0
Restore Area Station C ,T C ,P C2
B
AS
address
1 C 2
AS
address
C 2 F
0
Bypass Segment
C ,T
C , P ,T C3 C
Segment a
address V 1
C
3
Segment
*
address v
. .
c
3 F 0
Restore Segment C ,T C , P ,T C4 D
Segment
.
address ^
1 C
4
Segment
*
address v
_ _
_
c
4 F 0
Set Read-Deferred-Data Mode
C * * * * C5 E
Stop 2790 Input C ,T C ,P C6 F
_
C
6
.
c
6 F 0
Restore 2790 Input C ,T C , P ,T C7
G
_
C 7
_ _ _
.
c
7 F 0
Set Dual Comm. Switch P
C 8 <; 8 F P
Reset Dual Comm. Switch P
C 9
c
9 F 0
User Table Load— Start C D1 J
User Table Load— Data C
D2 K
User Table Load— End C D3 L
CPU Restart C D4 M
Restart
number 2
2715 Restart C
c
,
p
D5 N
Restart
numbers** 4
D 5 D 5 F 0
Scan AS/Adapter Error V T* T* D6 O D 6 O
A S/
ADAPT D 6 F 0
Send Partial Error Log C C D7 P
_
D
7
D
7
F 0
Reinitialize Disk C
D8 Q
O n-Lin e Core Dump T
_ .
.
R
Core
address
4
Set Day C P E2 S
3-digit day
number***
4
F
Any numeric
characters
_
_
_
E 2 F 0
Monitor Day C P E3 T
_
E 3
. _
_
0
Any numeric
characters
Monitor Time C P E4 U
_
E 4
Any numeric
characters
Set Time
P
.
Any numeric
characters Any numeric
characters
_
E 5 F 0
Reset Read-Deferred-Data Mode
T
E6 W
In itialize Error Logout
Sectors (CE Function)
P
_
E A
. .
.
E A F 0
Reset TPS
P
E
B
_
_
_
_
E
B
F 0
Purge Core Data
P E C
_ _ _ _
E C F 0
*Response is sent to 2740, if availab le; otherwise, it is sent to the CPU.
**First two bytes specify deferred-restart-number; second two bytes specify priority-restart-number.
***First byte must be 0 (X'FO'); remaining three bytes specify any EBCDIC numeric character.
****Response is not immediate but dependent on certain conditions.
T No response is sent.
Q Segment Address
Segment A 'C1 •
Segment B 'C2'
Segment C
'C3'
Segment D 'C4'
• Figure 27. Control Requests
1
. r j = X‘F 1 ’ — The 2715 has performed a 2790 ERP
(Error Recovery Procedure) automatically. The rest
of the data bytes define the status of the 2790 system
and the actions, if any, taken to correct the problem.
See “2790 ERP Message Format” for the definition
of the data bytes.
2. rj = X‘F2’ — The 2715 has detected that less than
64 disk sectors remain available for data. The 2715
sends the X‘FD’ message and automatically causes
a X‘C
6
’ (‘stop 2790 input’) request to be initiated
as if it came from the CE/operator panel. The CPU
should (
1
) send X‘C5’ (‘set read deferred data mode’),
Transmission Control Unit 45