+--------------------------------------------------------------+
| Block 0 of ERRLOG.DAT: (data starts in block 1)              |
+--------------------------------------------------------------+
|              Pointer to the Header Summary section           |
+--------------------------------------------------------------+
| Device and Unit Information --                               |
| (The length of this section varies depending on ERL$U)       |
| (A seven-word entry for each device unit logged):            |
+-----------------------------+--------------------------------+
|             Device ID       |            Unit                |
+-----------------------------+--------------------------------+
|                 Number of error records logged               |
+--------------------------------------------------------------+
|                   Number of errors received                  |
+--------------------------------------------------------------+
|                         READ successes                       |
|                           (Two words)                        |
+--------------------------------------------------------------+
|                         WRITE successes                      |
|                           (Two words)                        |
+--------------------------------------------------------------+
|  Header Summary Section                                      |
+--------------------------------------------------------------+
| Total number of errors received (including occasions when the|
|   error logger was unable to record the error information)   |
+--------------------------------------------------------------+
|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                 |
+--------------------------------------------------------------+
|                 Next physical record number                  |
+--------------------------------------------------------------+
|            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                                                  |
| (a series of 256-word blocks containing error information):  |
+--------------------------------------------------------------+
|                    For each device error:                    |
+-----------------------------+--------------------------------+
|    Physical record number   |   Size of this error record    |
+-----------------------------+--------------------------------+
|             Device ID       |            Unit                |
+-----------------------------+--------------------------------+
| Number of occurrences of    |                                |
| this error with identical   |         Retry count            |
| registers                   |                                |
+-----------------------------+--------------------------------+
|                          Date of entry                       |
+--------------------------------------------------------------+
|                          Time of entry                       |
|                           (Two words)                        |
+--------------------------------------------------------------+
|                  Physical block number (Q.BLKN)              |
+--------------------------------------------------------------+
|                    User buffer address (Q.BUFF)              |
+--------------------------------------------------------------+
|                       Word count (Q.WCNT)                    |
+--------------------------------------------------------------+
|                  PAR1 value (Q.PAR) -- XM only               |
+-----------------------------+--------------------------------+
|     Total number of retries |   Number of registers to log   |
+-----------------------------+--------------------------------+
|                   The device registers:                      |
|                             .                                |
|                             .                                |
|                             .                                |
+--------------------------------------------------------------+
|                    For each parity error:                    |
+-----------------------------+--------------------------------+
|     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                            |
+--------------------------------------------------------------+
|                              MPR1                            |
+--------------------------------------------------------------+
|                        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)            |
+--------------------------------------------------------------+