BBBF Branch on Bit Bucket Full BBW Branch Both Ways BEW Branch Either Way BH Branch and Hang BMR Branch Multiple Registers BOB Branch On Bug BPO Branch on Power Off BR Branch Randomly BST Backspace and Stretch Tape CDS Condense and Destroy System CHRD Crash Head on Random Disk CLBR Clobber Register CLBRI Clobber Register Immediately CM Circulate Memory CMFRM Come From -- essential for truly structured programming CPPR Crumple Printer Paper and Rip CRN Convert to Roman Numerals 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]) JTBI Jam Tape and Beep Incessantly MTE Mangle Tape and Eject PBC Print and Break Chain PDSK Punch Disk PI Punch Invalid POPI Punch Operator Immediately PVLC Punch Variable Length Card RASC Read And Shred Card ROTCSB ROT13 checksum byte RPM Read Programmers Mind RSSC reduce speed, step carefully (for improved accuracy) RTAB Rewind tape and break RTFM erase system documentation RWDSK rewind disk RWOC Read Writing On Card SCRBL scribble to disk - faster than a write SLC Search for Lost Chord SPSW Scramble Program Status Word SRSD Seek Record and Scar Disk STROM Store in Read Only Memory TDB Transfer and Drop Bit VVV I came, I saw, I conquered WBT Water Binary Tree