+------------------------------------------------------------+      
|  Pointer to the Header Summary section in Block 0          |      
+------------------------------+-----------------------------+    
|           Device ID          |           Unit Number       | <--+   
|------------------------------+-----------------------------|    |
|               Number of error records logged               |    |
|------------------------------------------------------------|    |
|                 Number of errors received                  |  Records 
|------------------------------------------------------------|  For Each
|                       READ successes                       |  Error-Logging
|                         (Two words)                        |  Device  
|------------------------------------------------------------|    |
|                       WRITE successes                      |    |
|                         (Two words)                        | <--+
+------------------------------------------------------------+
| Total number of errors received (including occasions when  | <--+
| the error logger was unable to record the error data)      |    |
|------------------------------------------------------------|    |
| Count of missed records (not recorded because the error    |    |
| logger input buffers were full)                            |    |
|------------------------------------------------------------|    |
| Count of missed records (not recorded because ERRLOG.DAT   |    |
| was full)                                                  |    |
|------------------------------------------------------------|    |
| Count of missed records (not recorded because start up or  |    |
| shut down was in progress)                                 |    |
|------------------------------------------------------------|    |
|               Number of memory parity errors               |    |
|------------------------------------------------------------|    |
|                Number of cache parity errors               |  Header
|------------------------------------------------------------|  Summary
|                 Next physical record number                |  Section
|------------------------------------------------------------|    |
|            Block number for start of next record           |    |
|------------------------------------------------------------|    |
|         Offset within the block for the next record        |    |
|------------------------------------------------------------|    |
|            Maximum size of error file, in blocks           |    |
|------------------------------------------------------------|    |
|          Configuration word 1 (monitor fixed offset 300)   |    |
|------------------------------------------------------------|    |
|          Configuration word 2 (monitor fixed offset 370)   |    |
|------------------------------------------------------------|    |
|                   Date of initialization                   |    |
|------------------------------------------------------------|    |
|                   Time of initialization                   |    |
|                        (Two words)                         |    |
+------------------------------------------------------------+ <--+

Data Blocks Beginning with Block 1
+------------------------------+-----------------------------+ <--+
|   Physical record number     | Size of this error record   |    |
|------------------------------+-----------------------------|    |
|           Device ID          |    Unit Number              |    |
|------------------------------+-----------------------------|    |
|Number of occurrences of this |    Retry count              |    |
|error with identical registers|                             |    |
|------------------------------+-----------------------------|    |
|                          Date of entry                     |    |
|------------------------------------------------------------|    |
|                          Time of entry                     |    |
|                           (Two words)                      |    |
|------------------------------------------------------------|    |
|                  Physical block number (Q.BLKN)            |  For Each
|------------------------------------------------------------|  Device 
|                    User buffer address (Q.BUFF)            |  Error
|------------------------------------------------------------|    |
|                       Word count (Q.WCNT)                  |    |
|------------------------------------------------------------|    |
|                  PAR1 value (Q.PAR) -- XM only             |    |
|------------------------------+-----------------------------|    |
|   Total number of retries    | Number of registers to log  |    |
|------------------------------+-----------------------------|    |
|                      (The device registers)                |    |
|                              .                             |    |
|                              .                             |    |
|                              .                             |<---+
|------------------------------+-----------------------------|
|   Physical record number     |  Size of this error record  |<---+ 
|------------------------------+-----------------------------|    |
| Number of memory registers   |            Parity ID        |    |
|------------------------------+-----------------------------|    |
|    Number of occurrences of this error with the same PC    |    |
|------------------------------------------------------------|    |
|                         Date of entry                      |    |
|------------------------------------------------------------|    |
|                         Time of entry                      |    |
|                          (Two words)                       |    |
|------------------------------------------------------------|    |
|                             PC                             |    |
|------------------------------------------------------------|    |
|                             PSW                            |    |
|------------------------------------------------------------|  For Each
|                            MPR1                            |  Memory
|------------------------------------------------------------|  Error
|                      Address of MPR1                       |    |
|------------------------------------------------------------|    |
|          (Information for up to 16 memory registers:)      |    |
|                              .                             |    |
|                              .                             |    |
|                              .                             |    |
|------------------------------------------------------------|    |
|     Memory system error register (if cache is present)     |    |
|------------------------------------------------------------|    |
|       Cache control register (if cache is present)         |    |
|------------------------------------------------------------|    |
|         Hit/Miss register (if cache is present)            |    |
+------------------------------------------------------------+<---+