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Local-Storage Allocations, Zone 1
AS or BS
LS
Field
Area
Decode
Code
Local-Storage Area
1000
10
Integrated file attachment
CCW count field,
high-order byte
1001
11
Integrated file attachment
CCW count field,
low-order byte
1010
TO
Integrated file attachment
data address,
high-order byte
1011
T1
Integrated file attachment
data address,
low-order byte
1100
PO
Working area (Flags)
1101
P1
Working area (Command)
1110
HO
Integrated file attachment
next CCW address,
high-order byte
1111
H1
Integrated file attachment
next CCW address,
low-order byte
Figure 1-50.
Local-Storage Decodes when
Mode Register Bits 5-7 are
001:
2311 Disk Locations
1-68
(7
/69)
Local-Storage Allocations, Zone 4
AS or BS
LS
Field
Area
Decode
Code
Local-Storage Area
0000
uo
Level-1 backup,
high-order byte
0001
U1
Level-1 backup,
low-order byte
0010
VO
Level-2 backup,
high-order byte
0011
V1
Level-2 backup,
low-order byte
0100
GO
Level-3 backup,
high-order byte
0101
G1
Level-3 backup,
low-order byte
0110
DO
Machine-check backup,
high-order byte
0111
D1
Machine-check backup,
low-order byte
The following locations are shared between zones
4, 5, 6, and 7.
1000
10
CPU branch and link backup,
high-order byte
1001
11
CPU branch and link backup,
low-order byte
1010
TO
Spare
1011
Tl
Spare
1100
PO
Level-1 working area
1101
Pl
Level-1 working area
1110
HO
Level-1 working area
1111
Hl
Level-1 working area
Figure 1-51.
Local-Storage Decodes when
Mode Register Bits 5-7 are
100:
Address Backup
Locations
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