Proposed Additions to the PDP-11 Instruction Set:

DC      Divide and Conquer
DMPK    Destroy Memory Protect Key
DO      Divide and Overflow
EMPC    Emulate Pocket Calculator
EPI     Execute Programmer Immediately
EROS    Erase Read Only Storage
EXCE    Execute Customer Engineer
HCF     Halt and Catch Fire
IBP     Insert Bug and Proceed
INSQSW  Insert into queue somewhere (for FINO queues [First in never out])
PBC     Print and Break Chain
PDSK    Punch Disk

back in the day used pdp11 as controllers for CNC (auto-insertion) 
machines ... particularly like the HCF instruction (wonder why)

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