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Record
HA
RO
Field
H
c
K
D
c
K
D
Zone
A 1 2
3
4
1 2
3
4
1 2
3
4
1
2
3
4
A B 1 2
3
4
1 2
3
4
1
2
3
4
H
Home-address area (including gaps)
C
Count area (including gaps)
K
Key area (including gaps)
D
Data area (including gaps)
Zone
Definition
1
Pre-record gap (including address marker)
2
Record
3
Cyclic code
4
Post-record gap
A
Constant gap of 12-ones bytes in the count field, or 28 all-zeros bytes
in the home-address field.
B
The 4.9% variable gap between records.
~
The index point immediately precedes the home-address area.
*
Location of the address marker.
Figure 1-117. 2311/DAC Tradc Orientation
I
Status and 1/0 Addr.:
I
Flags and Op*
Data Address
Local Storage
Zone 1 TO, T1
Count Field
Local Storage
Zone 1 10, 11
0 - Chain Data
Next CCW Address
Aux Store Mod 0,
Location K4
Aux-Store (Mod 0, Location 1<3)
0 -Active
1 - Came from SIO
2 - Return to I-cycles
3 - Performed Halt I
/0
1 - CC or CD and not unit check
2 - CC or CD and not unit check
3 - Skip
4-15 - File 1/0 Address
4-PCI
5 - Microprogram set Interrupt Latch
(Status in Interrupt Buffer)
6 -Any Interrupt Condition
7 -SU
* Flags - - In file external register D (FFI)
Op
- - In file external register F (FOP)
Note:
Unlike UCW's for other 1/0 attachments, the 2311 UCW
is stored in Local Storage, External Registers, and
Auxiliary Storage.
Figure 1-118 .• 2311
ucw
Format
2025 FEMM (7/69) 1-111
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