| Offsets | Name | Length | Format | Description | |
|---|---|---|---|---|---|
| 0 | 0 | S42ASYID | 4 | EBCDIC | System ID. |
| 4 | 4 | S42JOBN | 8 | EBCDIC | Job Name. |
| 12 | C | S42RDST | 4 | binary | Reader start time. |
| 16 | 10 | S42RDSD | 4 | packed | Reader start date (0cyyddf). |
| 20 | 14 | S42AAUID | 8 | EBCDIC | User identification. |
| 28 | 1C | S42ASTPN | 1 | binary | Job step number. |
| 29 | 1D | S42FLAGS S42B37 |
1 | binary | Flags
|
| 30 | 1E | * | 4 | Reserved. | |
| 34 | 22 | S42DSORG | 2 | binary | DSORG (data set organization). |
| 36 | 24 | S42ADISP | 1 | binary | Disposition. |
| 37 | 25 | S42DSNME | 44 | EBCDIC | Data set name. |
| 81 | 51 | S42VOLSR | 6 | EBCDIC | Volume serial number of current volume. |
| 87 | 57 | S42UCBTP | 4 | binary | UCB type information. |
| 91 | 5B | S42NEXT | 1 | binary | Number of extends on the current volume for this data set. |
| 92 | 5C | S42TNTRK | 4 | binary | Total number of tracks for data set on this volume. |
| 96 | 60 | S42ASSAT | 4 | binary | Secondary allocation amount from the JFCB. |
| 100 | 64 | S42ADRLH | 3 | binary | Average block length if specified. |
| 103 | 67 | * | 5 | Reserved. | |