The first field in the standard record header is a 1-byte hexadecimal code that identifies the type (or class) and source of the record.
Table 1 shows the record types that each of the operating systems records on its ERDS, listed according to the record class code.
| Description | MVS | VM | VSE |
|---|---|---|---|
| 1X Machine check errors | |||
| 10 MCH | Y | Y | Y |
| 13 MCH in multiple storage environment | Y | Y1 | Y |
| 2X Channel check errors | |||
| 20 CCH | Y | Y² | Y |
| 21 CCH in multiple storage environment | Y3 | ||
| 23 SLH subchannel logout | Y⁴ | ||
| 25 CRW channel report word | Y⁴ | ||
| 3X Outboard errors | |||
| 30 OBR | Y | Y1 | Y |
| 34 BTAM OBR (VSE) | Y | ||
| 36 VTAM OBR | Y | Y | |
| 3A DPA OBR | Y | ||
| 3C DPS OBR | Y | ||
| 4X Software errors | |||
| 40 Software-detected | Y | ||
| 42 Hardware-detected | Y | ||
| 44 Operator-detected | Y | ||
| 48 Hardware-detected hardware | Y | ||
| 4C Programming symptom code | Y | ||
| 4E Programming symptom code | Y | ||
| 4F Lost record | Y | ||
| 50 IPL | Y | Y | |
| 60 DDR | Y3 | Y⁵ | |
| 7X Missing interrupt handler | |||
| 70 MIH | Y3 | Y² | Y⁶ |
| 71 MIX | Y⁴ | Y⁴ | Y |
| 8X System termination | |||
| 80 EOD Normal End of Day | Y | Y | |
| 81 Nonrestartable wait state (MCH) Forced | Y3 | ||
| 84 EOD Restartable | Y3 | ||
| 84 Restartable wait state (IOS) Forced | Y3 | ||
| 9X Miscellaneous data record (MDR) | |||
| 90 MDR formatted by SVC91 | Y | Y | |
| 91 MDR | Y | Y1 | Y |
| A0 MCH frame | Y | Y | Y |
| A1 External Time Reference | Y | Y | Y |
| A2 Link Maintenance Information | Y | Y | Y |
| A3 Asynchronous Notification | Y | Y | Y |
| A4 through AF records | Y | Y | |
| B0 CCH frame | Y | Y | Y |
| B1 through BF records | Y | Y | Y |
| C0 through CF records | Y | Y | Y |
| D0 through DF records | Y | Y | Y |
| E0 through EF records | Y | Y | Y |
| F0 through FF records | Y | Y | Y |
| Note:
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