Hitachi S10Mini SV.Link Hardware Manual page 69

The error code (BD000) in the status area, which is mentioned on the previous page, is cleared
to zero when error recovery is achieved, for instance, by a communication retry operation.
Previously encountered errors can be confirmed by viewing the error code trace area indicated
below. The error code trace area stores the codes for up to sixteen most recently encountered
errors. If a seventeenth error occurs, it overwrites the oldest error occurrence recording.
Also, note that the error code trace area is cleared when a reset or power-on reset is performed.
Address (submodule)
0x873B10(0x8F3B10)
Error code trace area
Write pointer
(Reserved for future use)
+0x02
+0x04 Error code (longword)
Case No. 0
+0x08 Error code
Case No. 1
Error code
+0x0A
Case No. 2
：
：
：
Error code
+0x40
Case No. 15
+0x44
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6 MAINTENANCE
...Case number (0 to 15) to be written next