A list of undocumented instructions in the
Motorola 68000 instruction set


BBBF      Branch on Bit Bucket Full
BBT       Branch on binary tree  
BBW       Branch Both Ways
BEW       Branch Either Way
BH        Branch and Hang
BMR       Branch Multiple Registers
BOB       Branch On Bug
BOD       Beat on drum 
BOI       Byte operator immediately  
BPDI      Be polite, don't interrupt  
BPO       Branch on Power Off
BST       Backspace and Stretch Tape
CDS       Condense and Destroy System
CEMU      Close eyes and monkey with user space
CLBR      Clobber Register
CLBRI     Clobber Register Immediately
CM        Circulate Memory
CMFRM     Come From  (essential for truly structured programming)
CPAR      Crumple paper and rip
CPPR      Crumple Printer Paper and Rip
CRB       Crash and burn
CRN       Convert to Roman Numerals
CU        Convert to unary 
CZZC      Convert zone to ZIP code 
DC        Divide and Conquer
DMPK      Destroy Memory Protect Key
DNPG      Do not pass go   
DO        Divide and Overflow
DWIMNWIS  Do what I mean, not what I say
EIOC      Execute invalid opcode 
EMPC      Emulate Pocket Calculator
EPI       Execute Programmer Immediately
EROS      Erase Read Only Storage
EXCE      Execute Customer Engineer
EXOP      Execute operator 
EXPP      Execute political prisoner
FSRA      Forms skip and run away  
GFD       Go forth and divide  
GFM       Go forth and multiply  
HCF       Halt and Catch Fire
IBP       Insert Bug and Proceed
IIB       Ignore inquiry and branch  
INSQSW    Insert into queue somewhere (for FINO queues [First in never out])
LCC       Load and clear core  
MBF       Multiply and be fruitful   
MLR       Move and lose record 
PBC       Print and Break Chain
PD        Play dead 
PDSK      Punch Disk
PI        Punch Invalid
POPI      Punch Operator Immediately
PS*       Punch obscenity 
PSD       Pause and smoke dope
PVLC      Punch Variable Length Card
RASC      Read And Shred Card
RD        Reverse directions  
RDS       Read sideways 
RIRG      Read inter-record gap 
RPM       Read Programmer's Mind
RSD       On read error self destruct 
RSSC      Reduce Speed, Step Carefully (for improved accuracy)
RSTOM     Read from store-only memory 
RTAB      Rewind tape and break
RWCR      Rewind card reader  
RWDSK     Rewind Disk
RWOC      Read Writing On Card
SCRBL     Scribble to disk - faster than a write
SHAB      Shift a bit
SHLBM     Shift a little bit more
SLC       Search for Lost Chord
SMR       Skip on meaningless result
SOT       Sit on a tack 
SPSW      Scramble Program Status Word
SQPC      Sit quietly and play with your crayons
SQSW      Scramble program status word
SRSD      Seek Record and Scar Disk
SRZ       Subtract and reset to zero 
SSJ       Select stacker and jam
STROM     Store in Read Only Memory
TDB       Transfer and Drop Bits
UER       Update and erase record
WBT       Water Binary Tree
WEMG      Write eighteen-minute gap   
WPM       Write programmer's mind  
XSP       Execute systems programmer