IBM 3350-A2 Reference Manual page 26

Page ot 0A26-l 638-I
Revised Jan. 31, 1978
By TNL: GN26-0342
Recovery Action Table (continued)
Action Explanation
6
a. Perform error correction function.
b. Examine bit 7 of the file mask (PCI). If off, go to step c. If on, return to user with indication that the data
has been corrected. (User is operating in PCI fetch mode and must supply own restart recovery action.)
c. Increment the seek argument by one (see Note# below).
d. Construct restart CCW 2.
e. Complete the interrupted operation and continue the user's chain (if appropriate) by executing:
Seek (argument from step c)
Set File Mask (same as original)
Set Sector (argument 0)
Search ID Equal (record 1)
TIC*-8
Restart CCW 2
TIC (CSW)
(channel status word)
Note: If the modified seek argument is not within the user's extent, IDS must supply the correct seek argument
before issuing the Seek. If that is impossible, /OS must do action 2.
68
a. Examine bit 7 of the file mask (PCI). If off, go to step b. If on, return to user with indication that data has
been corrected. (User is operating in PCI fetch mode and must supply own restart recovery action.)
b. Construct restart CCW 2.
c. Complete the interrupted operation and continue the user's chain (if appropriate) by executing the
following:
Seek (see Note
#
below)
Set File Mask (same as original)
Set Sector (argument 0)
Search ID Equal (record 1)
TIC*-8
Restart CCW 2
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 2 of 4)
22 IBM 3350 Reference Manual
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