Use this system macro to process certain tape control channel command words
(CCWs) that are not included in the normal macro set (for example, forward
space block).
Required Authorizations
|
Key0
| Restricted
| System
| Common Storage
|
| X
|
|
|
Format
- label
- A symbolic name may be assigned to the macro statement.
- NAME=tape_name
- A 3-character symbolic general tape name must be specified as the first
parameter.
- LEVEL=level
- A symbolic data level (D0-DF) must be specified as the second
parameter.
- CCW1=NO|YES
- This parameter is used to indicate the format of CCW in the specified data
level. If CCW1=YES, the CCW is treated as CCW format-1, otherwise CCW
format-0 is assumed. CCW1=NO is the default.
The following format is still supported.
- label
- A symbolic name may be assigned to the macro statement.
- tape_name
- A 3-character symbolic general tape name must be specified as the first
parameter.
- level
- A symbolic data level (D0-DF) must be specified as the second
parameter.
- CCW1=NO|YES
- This parameter is used to indicate format of CCW in the specified data
level. If CCW1=YES, the CCW is treated as CCW format-1, otherwise CCW
format-0 is assumed. The default is CCW1=NO is the default.
Entry Requirements
Return Conditions
- Control is returned to the next sequential instruction (NSI).
- The contents of R14 and R15 are unknown. The contents of all other
registers are preserved across this macro call.
- The status of the control operation is unknown.
Programming Considerations
- This macro can be run on any I-stream.
- To ensure completion of the control operation, a WAITC macro should be
coded after this macro.
- Only the data chain, suppress incorrect length indication, and suspend
flags may be set in the CCW.
- During normal processing of this macro the CCW contained in the FARW is
not modified. If an unusual condition is encountered, however, the
operation count in the CCW will be adjusted to reflect the actual number of
operations successfully processed.
- When an unusual condition such as end-of-file or end-of-tape is
encountered return is made to the operational program through the system error
WAITC return mechanism. All subsequent I/O requests are processed
normally and are also flagged appropriately at WAITC return.
Examples
None.