Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site sdcsvax.UUCP Path: utzoo!watmath!clyde!burl!ulysses!mhuxl!ihnp4!zehntel!hplabs!sdcrdcf!sdcsvax!laman From: laman@sdcsvax.UUCP (Mike Laman) Newsgroups: net.jokes Subject: A (The?) List of Opcodes... (LONG) Message-ID: <928@sdcsvax.UUCP> Date: Wed, 27-Jun-84 17:47:25 EDT Article-I.D.: sdcsvax.928 Posted: Wed Jun 27 17:47:25 1984 Date-Received: Sun, 1-Jul-84 03:50:23 EDT Organization: EECS Dept. U.C. San Diego Lines: 886 Yea, I guess it has been about 4 months since someone asked the age old question on opcodes. In an effort to cut down the large number of articles that will reply I am sending out my list. It is pretty complete -- considering it has 879 (!) opcodes. This is a collection of those from the network that I have been compiling for quite some time now. Please make sure your favorite opcode ISN'T on this list before sending something out on the net. Enjoy... AAC Alter All Commands AAD Alter All Data AAO Add And Overflow AAR Alter At Random AB Add Backwards ABR Add Beyond Range ACC Advance Cpu Clock ACQT Advance Clock to Quitting Time ADB Another Damn Bug [UNIX] AEE Absolve Engineering Errors AFF Add Fudge Factor AFHB Align Fullword on Halfword Boundary AFP Abnormalized Floating Point AFVC Add Finagle's Variable Constant AFVC Add Finagle's Variable Constant [the constant that must be added to make your data support your conclusions] AGB Add GarBage AI Add Improper AI Add Improperly AIB Attack Innocent Bystander AMM Answer My Mail ANFSCD And Now For Something Completely Different AOI Annoy Operator Immediate AR Alter Reality ARN Add and Reset to Non-zero ARZ Add and Reset to Zero AS Add Sideways AT Accumulate Trivia AWP Argue With Programmer AWTT Assemble With Tinker Toys BAC Branch to Alpha Centauri BAF Blow All Fuses BAFL Branch And FLush BAH Branch And Hang BALC Branch And Link Cheeseburger BAW Bells And Whistles BB Branch on Bug BBBB Byte Baudy Bit and Branch BBI Branch on Burned-out Indicator BBIL Branch on Burned-out Indicator Light BBL Branch on Burned-out Lamp BBLB Branch on Blinking Light Bulb BBT Branch on Binary Tree BBW Branch Both Ways BCB Burp and Clear Bytes BCF Branch on Chip box Full BCIL Branch Creating Infinite Loop BCR Backspace Card Reader BCU Be Cruel and Unusual BD Backspace Disk BD Branch to Data BDC Break Down and Cry BDM Branch and Disconnect Memory BDT Burn Data Tree BDT Burn Data Tree [next opcode after decorate data tree] BE Branch Everywhere [As in HHGttG's Infinite Improbability Computer] BEW Branch Either Way BF Belch Fire BH Branch and Hang BIRM Branch on Index Register Missing BLC Branch and Loop Continuous BLI branch and loop infinite BLM Branch, Like, Maybe BLMWM Branch, Like, Maybe, wow, Man BLP Boot from Line Printer BLR Branch and Lose Return BM Branch Maybe BMI Branch on Missing Index BMP Branch and Make Popcorn BMR Branch Multiple Registers BMY Branch MaYbe BMYR Branch MaYbe Register BNA Branch to Nonexistent Address BNCB Branch Never Come Back BNR Branch for No Reason BOB Branch On Bug BOD Beat On the Disk BOD Branch on Operator Desperate BOHP Bribe Operator for Higher Priority BOI Byte Operator Immediately BOP Boot Operator BOP Byte Operator BPB Branch on Program Bug BPD Branch on Programmer Debugging BPDI Be Polite, Don't Interrupt BPIM Bury Programmer In Manuals BPO Branch if Power Off BPO Branch on Power Off BPO Branch to Power Off BR Byte and Run BRA BRanch Anywhere BRA Branch to Random Address BRI BRanch Indefinitely BRL BRanch and Leak BRO BRanch to Oblivion BRSS BRanch on SunSpot BRT BRanch on Tuesdays BSC Burst Selector Channel BSI Backup Sewer Immediate BSM Branch and Scramble Memory BSO Branch on Sleeping Operator BSO Branch on Sleepy Operator BSST BackSpace and Stretch Tape BST Backspace and Stretch Tape BTD Byte The Dust BTJ Branch and Turn Japanese BTO Branch To Oblivion BW Branch on When BW Branch on Whim BWABL Bells, Whistles, and Blinking Lights BWF Buzy-Wait Forever BWOP BeWilder OPerator BYDS Beware Your Dark Side CAF Convert Ascii to Farsic CAI Corrupt Accounting Information CAIL Crash After I Leave CAT Confused And Tired [UNIX] CBA Compare and Branch Anyway CBNC Close, But No Cigar CBS Clobber BootStrap CC Call Calvary CC Compliment Core CC Crappy Control [UNIX] CCB Chocolate Chip Byte-mode CCB Consult Crystal Ball CCCI Clear Condition-Codes Indefinitely CCCP Conditionally corrupt current process CCD Choke, Cough and Die CCD Clear Core and Dump CCD Clear Current Directory [this may really exist!] CCR Change Channels Random CCS Chinese Character Set CCWR Change Color of Write Ring CD Complement disk CDC Close Disk Cover CDR Complement Disk Randomly CF Come From (replaces Go To) CFE Call Field Engineer CFS Corrupt File Structure CG Convert to Garbage CH Create Havoc CHAPMR CHAse Pointers around Machine Room CIB Change Important Byte CIMM Create Imaginary Memory Map CLBR CLoBber Register CLBRI CLoBber Register Immediately CM Circulate Memory CM Confuse Memory CMD CPU Melt Down CMD Compare Meaningless Data CMI Clobber Monitor Immediately CML Compute Meaning of Life CML Compute Meaning of Life (72) CMP Create Memory Prosthesis CMS Click MicroSwitch CN Compare Nonsensically CNB Cause Nervous Breakdown CNL Clear Next Location [It has a 0 opcode] COLB Crash for Operator's Lunch Break COMF COMe From COS Copy Object Code to Source (File) COWHU Come Out With your Hands Up CP Compliment Programmer CP%FKM CPU - FlaKeout Mode CP%WM CPU - Weird Mode CPB Create Program Bug CPPR Crumple Printer Paper and Rip CPR Complement PRogrammer CPR Compliment PRogrammer ("Aren't you cute!") CRASH Continue Running After Stop or Halt CRB CRash and Burn CRM Clear Random Memory CRM Create Memory CRN Convert to Roman Numerals CRU ConveRt to Unary CRYPT reCuRsive encrYPt Tape mnemonic [UNIX] CS Crash System CSL Curse and Swear Loudly CSN Call Supervisor Names CSNIO Crash System on Next I/O CSU Call Self Unconditional [the ultimate in recursive programming] CSYS Crash SYStem CTDMR Change Tape Density, Mid Record CU Convert to Unary CUC Cheat Until Caught CVFL ConVert Floating to Logical CVFP ConVert FORTRAN to PASCAL CVG ConVert to Garbage CWAH Create Woman And Hold CWDC Cut Wires and Drop Cores CWOM Complement Write-Only Memory CZZC Convert Zone to Zip Code DA Develop Amnesia DAB Delete All Bugs DAO divide and overflow DAP De-select Active Peripheral DAUF Delete All Useless Files [would YOU trust a computer that far?] DBL Desegregate Bus Lines DBR Debase Register DBTP Drop Back Ten and Punt DBZ Divide By Zero DC Degauss Core DC Divide and Conquer DCAD Dump Core And Die DCD Drop Cards Double DCGC Dump Confusing Garbage to Console DCI Disk Crash Immediate DCON Disable CONsole DCT Drop Cards Triple DCWPDGD Drink Coffee, Write Program, Debug, Get Drunk DD Destroy Disk DD Drop Disk DDC Daily During Calculations DDC Dally During Calculations DDOA Drop Dead On Answer DDS Delaminate Disk Surface DDWB Deposit Directly in Wastepaper Basket DEB Disk Eject Both DEC Decompile Executable Code DEI Disk Eject Immediate DEM Disk Eject Memory DES Disk Eject Swapped DHTPL Disk Head Three Point Landing DIA Develop Ineffective Address DIE DIsable Everyting DIIL Disable Interrupts and enter Infinite Loop DIRFW Do It Right For Once DISC DISmount CPU DK Destroy Klingons DK%WMM Disk Unit - Washing Machine Mode DKP Disavow Knowledge of Programmer DLN Don't Look Now... DLP Drain Literal Pool DMAG Do MAGic DMPE Decide to Major in Physical Education DMPK Destroy Memory Protect Key DNPG Do Not Pass Go DO Divide and Overflow DOC Drive Operator Crazy DPC Decrement Program Counter DPK Destroy storage Protect Key DPMI Declare Programmer Mentally Incompetent DPR Destroy PRogram DPR Destroy Program DPR Distribute Packages Randomly DPS Disable Power Supply DRAF DRAw Flowchart DRAM Decrement RAM DRI Disable Random Interrupt DROM Destroy ROM DRT Disconnect Random Terminal DS Deadlock System DSH Destroy Sector Header DSI Do Something Interesting DSP Degrade System Performance DSPK Destroy Storage Protect Key DSR Detonate Status register DSTD Do Something Totally Different DSUIT Do Something Utterly, Indescribably Terrible DT%FFP DecTape - Unload and Flappa-Flap DT%SHO DecTape - Spin Hubs Opposite DTC Destroy This Command DTE Decrement Telephone Extension DTI Do The Impossible DTRT Do The Right Thing DTVFL Destroy Third Variable From Left DU Dump User DUD Do Until Dead DW Destroy Work DW Destroy World DWIM Do What I Mean DWIT Do What I'm Thinking EAL Enable AC to Logic rack EAO Enable AC to Operator EBB Edit and Blank Buffer EBRS Emit Burnt Resistor Smell EBRS Emit burnt resistor smell EC Eat Card EC Eject Carriage ECL Early Care Lace ECO Electrocute Computer Operator ECP Erase Card Punch ED Eject Disk ED Execute Data ED Expunge Data [UNIX] EDD Eat Disk and Die EDIT Erase Data and Increment Time EDR Execute Destructive Read EDS Execute Data Segment EEP Erase Entire Program EFD Eject Floppy Disk EIAO Execute In Any Order EIO Erase I/O page EIOC Execute Invalid Op-Code EIOC Execute Invalid OpCode EIP Execute Programmer Immediately EJD Eject disk EJD%V EJect Disk with initial velocity V ELP Enter Loop Permanently EM Evacuate Memory EMPC EMulate Pocket Calculator EMSE Edit and Mark Something Else EMSL Entire Memory Shift Left EMT Electrocute Maintenance Technician EMW Emulate Matag Washer ENA ENable Anything ENF Emit Noxious Fumes EO Electrocute Operator EOB Execute Operator and Branch EOI Execute Operator Immediate [a fast version of another instruction] EOP Execute Operator EP Execute Programmer EPI Execute Programmer Immediate EPI Execute Programmer Immediately EPITS Execute Previous Instruction Then Skip EPP Eject Printer Paper EPS Electrostatic Print and Smear EPS Execute Program Sideways EPT Erase Process Table EPT Erase Punched Tape ERIC Eject Random Integrated Circuit ERM Erase Reserved Memory EROM Erase Read Only Memory EROS Erase Read Only Storage [Sounds like an IBM special!] EROS Erase Read-Only Storage ESB Eject Selectric Ball [from IBM selectric typewriter terminals] ESL Exceed Speed of Light ESP Enable SPrinkler system ETI Execute This Instruction [for recursive programs] ETM Emulate Trinary Machine EVC Execute Verbal Commands EWD Enter Warp Drive EWD Execute Warp Drive EX EXecute operation EXECP EXECute Programmer EXI EXecute Invalid operation EXO EXecute ignorant Operator EXOP EXecute OPerator EXPP EXecute Political Prisoner EXX [A real instruction on the Zilog Z-80 -- Zilog is owned by EXXon] FAY Fetch Amulet of Yendor FB Find Bugs FCJ Feed Card and Jam FD Forget Data FDR Fill Disk Randomly FFF Form Feed Forever FLD FLing Disc FLI Flash Lights Impressively FM Forget Memory FMP Finish My Program FOPC [Set] False Out-of-paper Condition FPC Feed Paper Continuously FPT Fire Photon Torpedoes FRG Fill with Random Garbage FSM Fold, Spindle and Mutilate FSM Fold, Spindle, and Mutilate FSRA Forms Skip and Run Away GBB Go to Back of Bus GCAR Get Correct Answer Regardless GDP Grin Defiantly at Programmer GDR Grab Degree and Run GENT GENerate Thesis GEW{JO} Go to the End of the World {Jump Off} GFD Go Forth and Divide GFM Go Forth and Multiply GIE Generate Irreversible Error GLC Generate Lewd Comment GMC Generate Machine Check GMCC Generate Machine Check and Cash GND Guess at Next Digit GORS GO Real Slow GREM Generate Random Error Message GREP Global Ruin, Expiration and Purgation [UNIX] GRMC Generate Rubber Machine Check GS Get Strange [randomly inverts bits being fed to the instruction decoder] GSB Gulp and Store Bytes GSI Generate Spurious Interrupts GSU Geometric Shift Up HACF Halt and Catch Fire [actually exists on some versions of the Motorola 6800 microprocessor, which causes the processor to stop fetching instructions and rapidly increment the address bus, forever] HAH Halt And Hang HCF Halt and Catch Fire HCP Hide Central Processor HCP Hide Central Processor [makes virtual CPU's act like virtual memories] HCRS Hang in CRitical Section HDO Halt and Disable Operator HDRW Halt and Display Random Word HELP Type "No help available" HF Hide a File HGD Halt, Get Drunk HHB Halt and Hang Bus HIS Halt in Impossible State HOO Hide Operator's Output HRPR Hang up and Ruin Printer Ribbon HUAL Halt Until After Lunch IA Illogical And IAD Illogical AnD IAE Ignore All Exceptions IAI Inquire And Ignore IAND Illogical And IBP Insert Bug and Proceed IBR Insert Bugs at Random ICB Interrupt, Crash, and Burn ICM Immerse Central Memory ICMD Initiate Core Melt-Down ICSP Invert CRT Screen Picture IDC Initiate Destruct Command IDI Invoke Divine Intervention IDNOP Indirect No-Op IDPS Ignore Disk Protect Switch IEOF Ignore End Of File IF Invoke Force IGI Increment Grade Immediately IGIT Increment Grade Immediately Twice II Inquire and Ignore IIB Ignore Inquiry and Branch IIB Ignore Interrupt and Branch IIC Insert Invisible Characters IIL Irreversable Infinite Loop IM Imagine Memory IMPG IMPress Girlfriend INCAM INCrement Arbitrary Memory (location) INI Ignore Next Instruction INOP Indirect No-op IOI Ignore Operator's Instruction IOP Interrupt processor, Order Pizza IOR Illogical OR IP Increment and Pray IPI Ignore Previous Instruction IPS Incinerate Power Supply IPS Increment Power Supply IPS Increment Processor Status IPT Ignite Paper Tape IRB Invert Record and Branch IRC Insert Random Commands IRE Insert Random Errors IRPF Infinite Recursive Page Fault ISC Ignore Supervisor Calls ISC Insert Sarcastic Comments ISI Increment and Skip on Infinity ISP Increment and Skip on Pi ISTK Invert Stack ITML Initiate Termites into Macro Library IU Ignore User JAA Jump Almost Always JFM Jump on Full Moon JHRB Jump to H&R Block JLP Jump and Lose Pointer JMAT JuMp on Alternate Thursdays JMF Jump if Moon is Full JN Jump to Nowhere JNL Jump when programmer is Not Looking JOM Jump Over Moon JRAN Jump RANdom [not to be confused with IRAN - Idiots random] JRCF Jump Relative and Catch Fire JRGA Jump Relative and Get Arrested JRN Jump RaNdom JRSR Jump to Random Subroutine JSU Jump Self Unconditional [the ultimate in iterative programming] JT Jump if Tuesday JTZ Jump to Twilight Zone JWN Jump When Necessary KCE Kill Consultant on Error KP Krunch Paper KUD Kill User's Data LAC Lose All Communication LAGW Load And Go Wrong LAP Laugh At Program(mer) LAP Laugh At Programmer LCC Load and Clear Core LCD Load and Clear Disk LCK Lock Console Keyswitch LEB Link Edit Backwards LIA Load Ineffective Address LMB Lose Message and Branch LMO Load and Mug Operator LMYB Logical MaYBe LN Lose inode Number [UNIX] LOSM Log Off System Manager LP%PAS Line Printer - Print And Smear LP%RDD Line Printer - Reverse Drum Direction LP%TCR Line Printer - Tangle and Chew Ribbon LPA Lead Programmer Astray LPRTC Load Program Counter from Real-Time Clock LRD Load Random Data LSBL Lose Super BLock [UNIX only] LSPSW Load and Scrample PSW LUM LUbricate Memory LWE Load What-Ever LWM Load Write-only Memory MAB Logical maybe MAB Melt Address Bus MAN Make Animal Noises MAZ Multiply Answer by Zero MBC Make Batch Confetti MBH Memory Bank Hold-up MBR Multiply and Be Fruitful MBTD Mount Beatles on Tape Drive MBTOL Move Bugs To Operator's Lunch MC Move Continuous MD Move Devious MDB Move and Drop Bits MDDHAF Make Disk Drive Hop Across Floor MFO Mount Female Operator MLB Memory Left shift and Branch MLP Make Lousy Program MLP Multiply and Lose Precision MLR Memory Left Shift and Branch MLR Move and Lose Record MLSB Memory Left Shift and Branch MMLG Make Me Look Good MNI Misread Next Instruction MOP Modify Operator's Personality MOU MOunt User [causes computer to screw you once again] MPLP Make Pretty Light Pattern MRZ Make Random Zap MSGD Make Screen Go Dim MSIP Make Sure Plugged In MSR Melt Special Register MST Mount Scotch Tape MT%HRDV MagTape - High speed Rewind and Drop Vacuum MTI Make Tape Invalid MW Malfunction Whatever MW Malfunction Whenever MWAG Make Wild-Assed Guess MWC Move and Wrap Core MWK Multiply WorK MWT Malfunction Without Telling NTGH Not Tonight, i've Got a Headache OCF Open Circular File OML Obey Murphy's Law OML Obey Murphy's Laws OPP Order Pizza for Programmer OSI Overflow Stack Indefinitely OTL Out To Lunch PAS Print And Smear PAUD PAUse Dramatically PAZ Pack Alpha Zone PBC Print and Break Chain PBD Print and Break Drum PBM Pop Bubble Memory PBPBPBP Place Backup in Plain Brown Paper Bag, Please [for stealing code] PBST Play Batch mode Star Trek PCI Pleat Cards Immediate PCR Print and Cut Ribbon PD Play Dead PD Punch Disk PDSK Punch DiSK PEHC Punch Extra Holes in Cards PFD Punt on Fourth Down PFE Print Floating Eye [Roguers look out!] PFML Print Four Million Lines PI Punch Invalid PIBM Pretend to be an IBM PIC Print Illegible Characters PIC Punch Invalid Character PLSC Perform Light Show on Console PNRP Print Nasty Replies to Programmer PO Punch Operator POCL Punch Out Console Lights POPI Punch OPerator Immediately POPN Punch OPerator's Nose PPA Print Paper Airplanes PPL Perform Perpetual Loop PPP Print Programmer's Picture PPR Play Punk Rock PPSW Pack Program Status Word PRS PRint and Smear PS Print and Smear PSP Print and Shred Paper PSP Push Stack Pointer PSR Print and Shred Ribbon PTP Produce Toilet Paper PVLC Punch Variable Length Card PYS Program Yourself QWA Quit While Ahead RA Randomize Answer RAM Rationally abort monitor RAM Reorganize and Abort Monitor RASC Read And Shred Card RASC Read and Shred Card RAST Read and Shred Tape RAST Rewind And Stretch Tape RAU Ridicule All Users RBAO Ring Bell and Annoy Operator RBG Random Bug Generate RBLY Restore Backup from Last Year RBT Read Blank Tape RBT Read and Break Tape RBT Rewind and Break Tape RCAJ Read Card And Jam RCB Read Command Backwards RCB Read Commands Backwards RCB Run Clock Backwards RCC Read Card and Chew RCCP Randomly Corrupt Current Process RCF Rewind Cabinet Fans RCKG Read Count Key and Garbage RCL Rotate Carry Left RCR Rewind Card Reader RCRV Randomly Convert to Reverse Video RCS Read Card, Scramble data RCSD Read Card and Scramble Data RD Randomize Data RD Reverse Directions RDA Refuse to Disclose Answer RDB Run Disk Backwards RDD Reverse Disk Drive RDF Randomize Directory Filenames RDI Reverse Disk Immediate RDI Reverse Dum Immediate RDR Reverse Disk Rotation (Read data in reverse) RDS ReaD Sideways RENVR Rename Variables Randomly RET Read and Erase Tape RF Read Fingerprints RG Record Garbage RIC Rotate Illogical thru Carry RID Read Invalid Data RIR Read Invalid Record RIRG Read Inter-Record Gap RIRG Rewrite Inter-Record Gap [random replacement of similar mnemonic] RLC Relocate and Lose Core RLC Reread Last Card RLI Rotate Left Indefinitely RLP Refill Light Pen RLP Rewind Line Printer RM Ruin My files [UNIX] RMI Randomize Memory Immediate RMV Remove Memory Virtues RN Read Noise RNBS Reflect Next Bus Signal RNR Read Noise Record ROC Randomize Op Codes ROD ROtate Diagonally ROM Read Operator's Mind ROO Rub Out Operator ROOP Run Out Of Paper ROPF Read Other People's Files ROS Reject Op System ROS Return On Shield ROT Rotate Disk [fixes broken drives] RP Read Printer RPB Raise Parity Bits RPB Read Print and Blush RPB Reverse Parity and Branch RPBR Reverse Parity and BRanch RPM Read Programmer's Mind RPU Read character and Print Upside down RRB Read Record and Blush RRC Rotate Random thru Carry RRR Read Record and Run away RRRL Random Rotate Register Left RRRR Random Rotate Register Right RRSG Round and Round She Goes... RRT Record and Rip Tape RRT Rewind and Rip Tape RS Random Slew RSD Read and Scramble Data RST Rewind and Stretch Tape RSTOM Read From Store-Only Memory RT Reduce Throughput RT Reduce Thruput RT Reverse Throughput RTP Reduce ThroughPut RTS Return To Sender RWCR Rewind CaRd Reader RWD ReWind Disk RWF Read Wrong File RWS Return With Shield SAD Search and destroy SAD Seek And Destroy SAI Skip All Instructions SAS Sit And Spin SC Scramble Channels SC Shred Cards SCB Spindle Card and Belch SCCA Short Circuit on Correct Answer SCH Slit Cards Horizontal SCI Shred Cards Immediate SCOM Set Cobol-Only Mode SCRRC SCRamble Register Contents SCST Switch Channel to Star Trek SCTR Stick Card To Reader SD Scramble Directory SD Slip Disk SDC Spool Disk to Console SDD Seek and Destroy Data SDDB Snap Disk Drive Belt SDE Solve Differential Equations SDI Self Destruct Immediately SDR Slam Down Rondo [Rondo is the worst soda ever created. The macho commercials told you of how "Rondo's lightly carbonated, so you can slam it down fast.] SDS Spool Disk to Console SEB Stop Eating and Burp SEX Set EXecution register [a real instruction for the RCA 1802] SEX Sign EXtend SFH Set Flags to Half mast SFH Set Flags to Half-mast SFT Stall For Time SFTT Strip Form Tractor Teeth SHAB SHift a Bit SHABM SHift a Bit More SHB Stop and Hang Bus SHCD SHuffle Card Deck SHIT Stop Here If Thursday SHON Simulate HONeywell CPU [permanent NO-OP] SHRC SHRed Card SHRT SHRed Tape SID Switch to Infinite Density SIP Store Indefinite Precision SLD Slip Disk SLP Sharpen Light Pen SMC Scramble memory contents SMD Spontaneous Memory Dump (Use only with classified data) SMR Skip on Meaningless Result SMS Shred Mylar Surface SMT Stretch MagTape SNM Show No Mercy SOAWP SOlve All the World's Problems SOB [a real PDP-11 instruction] SOD Surrender Or Die! SOP Stop and Order Pizza SOS Sign Off, Stupid SOS Sign off, Stupid SOT Sit On a Tack SP Scatter Print SP Staple and Punch SPA Sliding Point Arithmetic SPS Set Panel Switches SPS Short power supply SPS Smoke Power Supply SPSW Scramble Processor Status Word SPSW Scramble Program Status Word SQPC Sit Quietly and Play with Crayons SRBO Set Random Bits to Ones SRBZ Set Random Bits to Zeroes SRC Select Reader and Chew cards SRC Skip to Random Channel SRCC Select Reader and Chew Cards SRD Switch to Random Density SRDR Shift Right Double Ridiculous SRDR Shift Right, Double Ridiculous SRO Sort with Random Ordering SRR Set Registers to Random values [usually used prior to a RET or RTS] SRR Shift Registers Random SRSD Seek Record and Scar Disk SRSD Seek Record and Scratch Disk SRSZ Seek Record and Scar Disk SRU Signoff Random User SRZ Subtract and Reset to Zero SSB Scramble Status Byte SSD Seek and Score Disk [good for testing] SSD Seek and Scratch Disk SSD Stacker Select Disk SSJ Select Stacker and Jam SSJ Select Stacker and Jump SSJP Select Stacker and Jump SSM Solve by Supernatural Means SSM Stacker Select Memory SSP Seek SPindle SSP Smoke and SPark SST Stop and Stretch Tape ST Set and Test STA STore Anywhere STC Slow To a Crawl STD Stop, Take Drugs STM STretch Magtape STO Strangle Tape Operator STPR SToP Rain STROM STore in Read-Only Memory STTHB Set Terminal to Three Hundred Baud SUI Subtract User's IQ SUME Surprise Me SUP Solve Unsolvable Problem SUR Screw Up Royally SUS Stop Until Spring SUS Subract Until Senseless SWAT SWAp Terminals SWN SWap Nibbles SWOS SWap out Operating System SWS Sort to Wrong Slots SWT Select Wrong Terminal SWU Select Wrong Unit SZD Switch to Zero Density TARC Take Arithmetic Review Course TBFTG Two Burgers and Fries To Go TC Transmit Colors (but avoid red) TDB Transfer and Drop Bits TDS Trash Data Segment TLNF Teach me a Lesson i'll Never Forget TLO Turn indicator Lights Off TLW Transfer and Lose Way TN Take a Nap TOG Time Out, Graduate TOH Take Operator Hostage TOO Turn On/Off operator TOS Trash Operating System TPD Triple Pack Decimal TPDH Tell Programmer to Do it Him/Herself TPDH Tell Programmer to Do it Himself/Herself TPF Turn Power Off TPN Turn Power oN TPO Turn Power Off TPR Tear PapeR TR Turn into Rubbish [UNIX] TRA Te Rdls Arvs [Type Ridiculous Abbreviations] TSH Trap Secretary and Halt TSM Trap Secretary and Mount TST Trash System Tracks TT%CNK TeleType - Clunk Noise TT%EKB Electrify keyboard TT%EKB TeleType - Electrify KeyBoard TTA Try, Try Again TTITT Turn 2400 foot Tape Into Two 1200 foot Tapes TTL Tap Trunk Line TTL Time To Log off TYF Trust your feelings UAI Use Alternate Instruction set UCB Uncouple Communication lines and Break UCB Uncouple Cpu and Branch UCK Unlock Console Keyswitch UCPUB Uncouple CPU's and Branch UDR Update and Delete Record UER Update and Erase Record ULDA UnLoaD Accumulator UMR Unlock Machine Room UNPD UNPlug and Dump UOP Useless Operation UP Understand Program UP Understand Program(mer) UPA Use all Power Available UPC Understand Programmer's Comments UPI Undo Previous Instruction URB Update Resume and Branch UTF Unwind Tape onto Floor UTF Use the Force UUBR Use Undefined Base Register VAX Violate All eXecutions VFE Violate Field Engineer VFO Violate Female Operator VMA Violate Maintenance Agreement VNO Violate Noise Ordinance VPA Vanishing Point Arithmetic VVM Vaporise Virtual Memory WAD Walk Away in Disgust WBT Water Binary Tree WC Waste Core [UNIX] WCR Write to Card Reader WED write and erase data WEMG Write Eighteen Minute Gap WF Wait Forever WGPB Write Garbage in Process-control Block WHFO Wait until Hell Freezes Over WHP Wave Hands over Problem WI Why Immediate WI Write Illegibly WID Write Invalid Data WNHR Write New Hit Record WNR Write Noise Record WPET Write Past End of Tape WPM Write Programmer's Mind WSE Write Stack Everywhere WSWW Work in Strange and Wondrous Ways WUPO Wad Up Printer Output WWLR Write Wrong Length Record WWLR Write Wrong-Length Record WWR Write Wrong Record XIO Execute Invalid Opcode XKF Execute Kermit the Frog XMB Exclusive MayBe XOH Execute no-Op and Hang XOR Execute OperatoR XOS Exchange Operator's Sex XPR Execute Programmer XPSW eXecute Program Status Word XSP eXecute Systems Programmer XVF Exchange Virtue for Fun ZAP Zero and Add Packed [This one exists on some PDPs] ZAR Zero Any Register ZD Zap Directory ZPI ZaP Immediate