> On Jan 4, 2019, at 6:51 AM, Paul Koning <paulkon...@comcast.net> wrote:
> 
> Plan B: set a breakpoint at "ERL" (040672 in your map) which is the entry 
> point to the error logging code.  That's where the display register is 
> incremented as part of logging an error.  On entry, R0 is the EMT code (a 
> LOG$xx code, because these are EMTs in kernel mode).  Many of those codes are 
> fixed and defined in KERNEL.MAC which is in the kit.  The ones that are 
> configuration-dependent are in the RSTS.MAP listing, for example LOG$KB.  The 
> log code would tell us which device or component is unhappy.

Okay:

  BE125652
  _040672;B
  _P
  0B:040672
  _$0;$7L
  $0 /000000 000400 001764 000000 000000 000000 001730 040672

  _$S/004340
  _777400;777412L
  177400 /004713 000000 000344 000000 014000 001260

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