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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
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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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