SEQPDL parameter
Minimum PDL available for sequencer
Summary
- Default value
- 4096
- Parameter type
- Utable
- Where set
- On user's parameter line or reset by UTABLE command
- Related products
- All
- Introduced
- Model 204 version 7.5
Description
The SEQPDL parameter controls the amount of free space that must be present in the user's Push Down List in order for the SOUL sequencer to proceed with the next quad code. The minumum and default value is 4096 bytes. The maximum value is 8192 bytes. SEQPDL is a user resettable parameter and can be set on the user's parameter line or may be reset by the UTABLE command. The old value was 1024 and was a hardcoded internally in the Model204 nucleus. With 1024 bytes there were edge cases where abends would break files. This is an attempt to allow enough PDL space so that all of the lower level journaling routines can process error conditions without breaking files.
SEQPDL might require you to increase the size of the user Push Down List (UTABLE LPDLST parameter) by up to 3072 bytes, or more if you specify a value for SEQPDL that is larger than the 4096 default value. This increase should avoid any issues associated with ERROR 2126 USER'S PUSHDOWN LIST OVERFLOWED.