IBM 2025 Maintenance Manual page 115

TIC Command Code
Decimal Hexadecimal Binary
xa
XB XXXX1000
Positions Marked "X" are Ignored
Figure 1-97 ..
2311/DAC Cperaticn Cede fer
TIC Command
No-Operation Command Code
Decimal Hexadecimal Binary
03 03 00000011
Figure 1-98. 2311/DAC Operation Code for
No-op command
Set File Mask
7 8
Set File Mask Command Code
Decimal Hexadecimal Binary
31
1F 0001 1111
Bo B1
Permit Write Commands
0 0 All Except Write Home Address
and Write Record Ro
0
None
0 Write Data or Write Key & Data
All
Data Address
Specifies CPU Storage
Location of the Mask
Byte.
Mask Byte
Decimal
19
Recalibrate Command Code
1
Hexadecimal
l
Binary
13 00010011
Figure 1-99. 2311/DAC Operation Code for
Recalibrate Command
Read IPL Command Code
Decimal Hexadecimal Binary
02 02 0000 0010
Figure 1-100. 2311/DAC Read IPL Command
Code
Flags
000 Count
31 32 36 47 48 63
(0000000000000001)
Permit Seek Commands
0 0 All
0 Seek Cylinder or Seek Head
0 Seek Head
None
For the 2311, bits 2,5,6 and 7 of the mask must be zero. If these
bits are not zero, the mask is considered to be invalid and a unit
check signal is generated. A subsequent sense command indicates
command reject.
Figure 1-101. 2311/DAC Set File Mask Command
2025 FEMM
(7/69)
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