[no subject]

[RG@MIT-AI]

  BUG IN MICROCODE:  THE MACROINSTRUCTIONS SET-E-CDR AND SET-E-CDDR
WORK BY PUSHING THE VMA ON THE PDL, CALLING CDR OR CDDR, RESTORING THE
VMA, AND GOING TO RPWCYC.  IF THE EFFECTIVE ADDRESS OF THE INSTRUCTION
IS (ARG N) OR (LOC N), THE VMA CAN POINT TO COMPLETE RANDOMNESS
(FOR INSTANCE, DIRECTLY AT THE MACROINSTRUCTIONS THAT ARE BEING EXECUTED).
THEN, IF A SEQUENCE BREAK OR ERROR IS TAKEN AT QCDR, A LOCATIVE TO
GARBAGE IS LEFT ON THE STACK.