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Changed trap number into bit shifted by number for ignore mask.
The whole example is, at leat, unclear.
The trap for EFOVL never occurs!

keie hace 39 años
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aeb2d50790
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      doc/em/iotrap.nr

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doc/em/iotrap.nr

@@ -338,7 +338,7 @@ msave
  lim                    ; get current ignore mask
  ste msave              ; save it
  lim
- loc 4                  ; bit for EFOVFL
+ loc 16                  ; bit for EFOVFL
  ior 2                  ; set in mask
  sim                    ; ignore EFOVFL from now on
  lpi $catch             ; load procedure identifier