Cliff writes:

Undocumented 8088/8086/80286/80386 Instruction Set

Quoting from the good old NutWorks online humor magazine, issues 6 and
7, from October and November 1985, respectively:

OP CODES
========
(Contributed By Knappy 8350428 @ UWAVM)

mnemonic meaning
-------- -------
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 "the constant
that must be added to make your data support
your conclusions"
AGB Add GarBage
AI Add Improper
AIB Attack Innocent Bystander
AMM Answer My Mail
AOI Annoy Operator Immediate
AR Alter Reality
ARNZ Add & Reset to Non-Zero
ARZ Add & 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
BAH Branch And Hang
BALC Branch And Link Cheeseburger
BAW Bells And Whistles
BB Branch on bug
BBB Burn Baby Burn
BBBB Byte Baudy Bit and Branch
BBI Branch on Blinking Indicator
BBL Branch on Burned-out Lamp
BCB Burp and Clear Bytes
BCBF Branch on Chip Box Full
BCIL Branch Creating Infinite Loop
BCR Backspace Card Reader
BCU Be Cruel and Unusual
BD Backspace Disk
BDC Break Down and Cry
BDM Branch and Disconnect Memory
BDT Branch on Dumb Terminal
BDT Burn Data Tree [next opcode after Decorate Data
Tree
BDU Branch on Dumb User
BE Branch Everywhere [As in HHGttG's Infinite
Improbability Computer"
BF Belch Fire
BH Branch and Hang
BIRM Branch on Index Register Missing
BLC Branch and Loop Continuous
BLM Branch, Like, Maybe
BLMWM Branch, Like, Maybe, Wow, Man
BLR Branch and Lose Return
BM Branch Maybe
BMI Branch on Missing Index
BNA Branch to Nonexistent Address
BNR Branch for No Reason
BOA Branch on Operator Absent
BOD Branch on Operator Desperate
BOHP Bribe Operator for Higher Priority
BOP Boot OPerator
BPD Branch on Programmer Debugging
BPIM Bury Programmer In Manuals
BPO Branch on Power Off
BR Byte and Run
BRA BRanch Anywhere
BRA Branch to Random Address
BRI BRanch Indefinitely
BRO BRanch to Oblivion
BRP Branch on Real Programmer
BRT BRanch on Tuesdays
BSC Burst Selector Channel
BSM Branch and Scramble Memory
BSO Branch on Sleepy Operator
BSP BackSpace Printer
BST Backspace & Stretch Tape
BTD Byte The Dust
BTJ Branch & Turn Japanese
BTO Branch To Oblivion
BW Branch on Whim
BWABL Bells, Whistles And Blinking Lights
BWOP BeWilder OPerator
CAF Convert Ascii to Farsic
CAI Corrupt Accounting Information
CAIL Crash After I Leave
CAT Confused And Tired [UNIX]
CBA Compare & Branch Anyway
CBNC Close, But No Cigar
CBS Clobber BootStrap
CC Call Calvary
CC Crappy Control [UNIX]
CCB Consult Crystal Ball
CCCP Conceal Condition-Codes Permanently
CCD Choke, Cough and Die
CCD Clear Current Directory "this may really exist!"
CCD Clear Core and Dump
CCR Change Channels Random
CCS Chinese Character Set
CCWR Change Color of Write Ring
CDR Complement Disk Randomly
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
CM Circulate memory
CMD CPU Melt Down
CMD Compare Meaningless Data
CMI Clobber Monitor Immediately
CML Compute Meaning of Life (42)
CMP Create Memory Prosthesis
CMS Click MicroSwitch
CN Compare Nonsensically
CNB Cause Nervous Breakdown
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%FKM CPU - Flakeout mode
CP%WM CPU - Weird Mode
CPB Create Program Bug
CPR Compliment PRogrammer ("Aren't you cute!")
CPSN Change Processor Serial Number
CRASH Continue Running after Stop or Halt
CRM Clear Random Memory
CRN Convert to Roman Numerals [IBM Italy only]
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
CUC Cheat Until Caught
CVFL Convert Floating to Logical
CVFP ConVert FORTRAN to PASCAL
CVG ConVert to Garbage
CVU ConVert to Unary
CWAH Create Woman And Hold
CWDC Cut Wires and Drop Cores
DA Develop Amnesia
DAP De-select Active Peripheral
DAUF Delete All Useless Files "would YOU trust a
computer that far ???"
DBL Desegregate Bus Lines
DBR Debase Register
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
DDC Daily During Calculations
DDOA Drop Dead On Answer
DDS Delaminate Disk Surface
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
DIIL Disable Interrupts and enter Infinite Loop
DIRFW Do It Right For Once
DISC DISmount CPU
DJ Deferred Jump
DK Destroy Klingons
DK%WMM Disk Unit - Washing Machine Mode
DKP Disavow Knowledge of Programmer
DLN Don't Look Now...
DLP Drain Literal Pool
DMPE Decide to Major in Physical Education
DMPK Destroy Memory Protect Key
DO Divide & Overflow
DOC Drive Operator Crazy
DPC Decrement Program Counter
DPMI Declare Programmer Mentally Incompetent
DPR Destroy Program
DPS Disable Power Supply
DRAF DRAw Flowchart
DRI Disable Random Interrupt
DRT Disconnect Random Terminal
DS Deadlock System
DSH Destroy Sector Header
DSI Do Something Interesting
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
DTI Do The Impossible
DTRT Do The Right Thing
DTVFL Destroy Third Variable From Left
DU Dump User
DUD Do Until Dead
DVC Devaluate Computer
DW Destroy Work
DW Destroy World
DWIM Do What I Mean
DWIT Do What I'm Thinking
DWL Define Word Length
DWLZ Define Word Length Zero
EBRS Emit Burnt Resistor Smell
EC Eat card
EC Eject Carriage
ECI Execute Current Instruction
ECL Early Care Lace
ECO Electrocute Computer Operator
ECP Erase Card Punch
ED Eject Disk
ED Execute 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 OpCode
EIP Execute Programmer Immediately
EJD%V EJect Disk with initial velocity V
ELP Enter Loop Permanently
EM Emulate 407
EM Evacuate Memory
EMSL Entire Memory Shift Left
EMT Electrocute Maintenance Technician
EMW Emulate Matag washer
ENF Emit Noxious Fumes
ENH Execute No-op & Hang
EO Execute Operator
EOI Execute Operator Immediate
EP Execute Programmer
EPI Execute Programmer Immediate
EPP Eject Printer Paper
EPS Electrostatic Print and Smear
EPS Execute Program Sideways
EPT Erase Process Table
EPT Erase Punched Tape
ERI Execute Random Instruction
ERIC Eject Random Integrated Circuit
EROS Erase Read Only Storage "Sounds like an IBM
special!"
ESB Eject Selectric Ball "from IBM selectric
typewriter terminals"
ESL Exceed Speed of Light
ETI Execute This Instruction [for recursive programs"
ETM Emulate Turing Machine
EVC Execute Verbal Commands
EWD Execute Warp Drive
EXX A real instruction on the Zilog Z-80 -Zilog is
owned by EXX on"
FB Find Bugs
FCJ Feed Card and Jam
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
FSRA Forms Skip & 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
GESE Generate Exciting Sound Effects
GEW{JO} Go to the End of the World {Jump Off}
GID Generate Input Device
GIE Generate Irreversible Error
GLC Generate Lewd Comment
GMC Generate Machine Check
GMCC Generate Machine Check and Cash
GND Guess at Next Digit
GOD Generate Output Device
GORS GO Real Slow
GRAB Generate Random Address & Branch
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
HAH Halt And Hang
HCF Halt & Catch Fire
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
IAI Inquire and ignore
IAND Illogical And
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
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 & Branch
IIC Insert Invisible Characters
IIL Irreversable Infinite Loop
IM Imagine Memory
IMPG IMPress Girlfriend
INCAM INCrement Arbitrary Memory location
INOP Indirect No-op
IO Illogical Or
IOI Ignore Operator's Instruction
IOP Interrupt processor, Order Pizza
IOR Illogical OR
IP Increment and Pray
IPS Incinerate Power Supply
IPS Increment Processor Status
IPT Ignite Paper Tape
IRB Invert Record & Branch
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 Ignore Silly Instructions
ISI Increment and Skip on Infinity
ISP Increment and Skip on Pi
ITML Initiate Termites into Macro Library
IU Ignore User
JAA Jump Almost Always
JFM Jump on Full Moon
JHRB Jump to H&R Block
JIL Jump In Lake
JM Jump Maybe
JMAT JuMp on Alternate Thursdays
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
JT Jump if Tuesday
JTR Jump To Register
JTZ Jump to Twilight Zone
JUMP don't JUMP
JWN Jump When Necessary
KCE Kill Consultant on Error
KUD Kill User's Data
LAGW Load And Go Wrong
LAP Laugh At Program(mer)
LBTPS Let's Blow This Popsicle Stand (Context switch)
LCC Load & Clear Core
LCD Load and Clear Disk
LCK Lock Console Keyswitch
LEB Link Edit Backwards
LIA Load Ineffective Address
LMB Lose Message & 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
LRD Load Random Data
LSBL Lose Super BLock [UNIX only]
LSPSW Load and scrample PSW
LWM Load Write-only Memory
MAB Melt Address Bus
MAN Make Animal Noises
MAZ Multiply Answer by Zero
MBC Make Batch Confetti
MBH Memory Bank Hold-up
MBTD Mount Beatles on Tape Drive
MBTOL Move Bugs to Operator's Lunch
MC Move Continuous
MD Move Devious
MDB Move & Drop Bits
MDDHAF Make Disk Drive Hop Across Floor
MLP Multiply and Lose Precision
MLR Move & Loose Record
MLSB Memory Left Shift & 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]
MOVC Move Computer
MPLP Make Pretty Light Pattern
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
MWC Move & Wrap Core
MWT Malfunction Without Telling
NEGP NEGate Programmer
NTGH Not Tonight, I've Got a Headache
OCF Open Circular File
OH OverHeat
OML Obey Murphy's Law
OPP Order Pizza for Programmer
OSI Overflow Stack Indefinitely
OTL Out To Lunch
PADZ Pack Alpha & Drop Zones
PAS Print And Smear
PAUD PAUse Dramatically
PAZ Pack Alpha Zone
PBC Print & 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 Punch Disk
PEHC Punch Extra Holes in Cards
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
PIRI Print In Red Ink
PLSC Perform light show on console
PNRP Print Nasty Replies to Programmer
PO Punch Operator
PPA Print Paper Airplanes
PPL Perform Perpetual Loop
PPP Print Programmer's Picture
PPSW Pack program status word
PRS PRint and Smear
PSP Print and Shred Paper
PSP Push Stack Pointer
PSR Print and Shred Ribbon
QBB Query Bit Bucket
QWA Quit While Ahead

-tih
--
Tom Ivar Helbekkmo, Senior System Administrator, EUnet Norway Hosting
www.eunet.no T +47-22092958 M +47-93013940 F +47-22092901 FWD 484145