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Recovery Action Table (continued)
Action
Explanation
10
a.
Determine if the interrupted command is a seek. If yes, go to step b. If not, do action 10A.
b.
Continue the operation by executing the following:
Seek
(user's argument, see Note# below)
Set File Mask
(same as original)
Set Sector
(argument O)
Read Home Addr
(skip bit on)
TIC (CSW)
(channel status word)
Note: If the modified seek argument is not within the user's extent, IOS must supply the correct seek argument
before issuing the Seek. If that is impossible, /OS must do action 2.
10A
a.
This is a multitrack operation. Increment the user's seek argument by one (see Note# below).
b.
Continue the operation by executing the following:
Seek
(argument from step a)
Set File Mask
(same as original)
Set Sector
(argument 0)
Read Home Addr
(skip bit on)
TIC (CSW-8)
(channel status word -8)
Note: If the modified seek argument is not within the user's extent, /OS must supply the correct seek argument
before issuing the Seek. If that is impossible, /OS must do action 2.
11
a.
Increment the user's seek argument by one (see Note# below).
b.
Construct restart CCW 1.
c.
Complete the interrupted operation and continue the user's chain (if appropriate) by executing the
following:
Seek
(argument from step a)
Set File Mask
(same as original)
Set Sector
(argument 0)
Search ID Equal
(record 1)
TIC*-8
Restart CCW 1
TIC (CSW)
(channel status word)
Note: If the modified seek argument is not within the user's extent, /OS must supply the correct seek argument
before issuing the Seek. If that is impossible, /OS must do action 2.
Note#: Get the cylinder bytes and the high-order head byte from the user, not from the sense bytes. Get the low-order head
byte from sense byte 6, bits 3-7.
Figure 10. Recovery Action Table (Part 4 of 4).
24 IBM 3350 Reference Manual
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