First data block
+---------------+
|       1       |
+---------------+
|       0       |
+---------------+
|      BCL      | Low-order eight bits of byte count
+---------------+
|      BCH      | High-order eight bits of byte count
+---------------+
|      ADL      | Low-order byte of absolute load address
|               |  of data bytes in the block
+---------------+
|      ADH      | High-order byte of load address
+---------------+
|  Data bytes   |
|      .        |
|      .        |
|      .        |
+---------------+
| Checksum byte |
+---------------+

Intermediate data blocks
+---------------+
|       1       |
+---------------+
|       0       |
+---------------|  This pattern is repeated for al+
|      BCL      |   intermediate blocks.
+---------------+
|      BCH      |
+---------------+
|      ADL      |
+---------------+
|      ADH      |
+---------------+
|  Data bytes   |
|      .        |
|      .        |
|      .        |
+---------------+
| Checksum byte |
+---------------+

Last data block
+---------------+
|       1       |
+---------------+
|       0       |
+---------------+
|       6       |
+---------------+
|       0       |
+---------------+
|      JL       | Low byte of start address, or odd number
+---------------+
|      JH       | High byte of start address, or odd number
+---------------+
| Checksum byte |
+---------------+