

               EXTENDED OP-CODE SET FOR 8088/8086
                               OR
                    WHAT INTEL FORGOT TO TELL

     The following op-codes have been recently uncovered on the back of 
several used bar napkins in Silicon Valley, CA.  Several attempts have 
been made to get confirmation of these heretofore unknown codes, but Intel 
vehemently denies the existence of these in the 8088/8086 command set.
Several man-years have gone into the research of these codes. We would like 
to thank the programmers responsible for discovering them. Unfortunately, 
most of them are currently residents of the South Dakota Home for the 
Mentally Unfit, and are unable to receive mail. 
    A final warning is in order. Since Intel denies the existence of these 
codes, support of them cannot be guaranteed in subsequent hardware and/or 
software releases. Please use  with caution.

INSTRUCTION                  DEFINITION
-----------      ------------------------------------------------
   BAH           Branch and hang
   BIA           Branch to invalid address
   BST           Backspace and stretch tape
   CNR           Call subroutine (no return)
   CRN x         Convert to roman numerals (specify base x)
   DAK           Disable keyboard
   DAP           Deselect active peripherals
   DO            Divide and overflow
   IIB           Ignore interrupt and branch
   DSH           Destroy sector header
   DWIT          Do what I'm thinking (works intermittently)
   EAOP          Encrypt all output
   ED            Eject disk
   EDF           Erase data file
   CMI           Clobber monitor immediate
   EDR           Execute destructive read
   EIOC          Execute invalid op-code
   EP            Execute programmer
   ERM           Erase reserved memory
   FFC           Form feed (continuous)
   FOPC          (set) False out of paper condition
   HCF           Halt and catch fire
   HRPR          Hang and ruin printer ribbon
   IDPS          Ignore disk protect switch (or tab)
   IEOF          Ignore end of file
   MLR           Move and lose record
   PBD           Print and break drum (who remembers those?)
   PIC           Punch invalid code
   PSO           Punch system operator
   PPL           Perform perpetual loop
   RAST          Read and shred tape
   RDD           Randomize disk directory
   RDI           Reverse disk immediate
   RFF           Reverse form feed
   RIP           Randomize instruction pointer
   RIR           Read invalid record
   RLF           Reverse line feed
   RS            Random slew (usually best for plotters)
   RSP           Randomize stack pointer
   RSS           Reset system
   SAT           Scramble allocation table
   SFTT          Strip form tractor teeth
   RIRG          Read inter-record gap
   SIP           Scramble ISAM pointers
   SMD           Spontaneous memory dump
   SRSD          Seek record and scar disk
   SRZ           Subtract and reset to zero
   SSB           Scramble status byte
   SSJ           Select stacker and jam
   TDB           Transfer and drop bits
   TTS           Translate to Sanskrit
   UDR           Update and delete record
   WUPO          Wad up paper output
   CAH           Crash all heads
   ACQT          Advance clock to quitting time (works best on Fridays)
   ZD            Zap directory


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