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----------------------------------------------------------------
|                                                              |
|                                                              |
|                Digital Equipment Corporation                 |
|                                                              |
|       PPPPPP    DDDDD     PPPPPP           1       1         |
|       P     P   D    D    P     P         11      11         |
|       P     P   D     D   P     P          1       1         |
|       PPPPPP    D     D   PPPPPP    XXX    1       1         |
|       P         D     D   P                1       1         |
|       P         D    D    P                1       1         |
|       P         DDDDD     P               111     111        |
|                                                              |
|         PDP-11 Minicomputer Instruction Set Summary          |
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|Written by     Jonathan Bowen                                 |
|               Programming Research Group                     |
|               Oxford University Computing Laboratory         |
|               8-11 Keble Road                                |
|               Oxford OX1 3QD                                 |
|               England                                        |
|                                                              |
|               Tel +44-865-273840                             |
|                                                              |
|Created        March 1982                                     |
|Updated        April 1985                                     |
|Issue          1.2                Copyright (C) J.P.Bowen 1985|
----------------------------------------------------------------
----------------------------------------------------------------
|Mnemonic |Opcode|NZVC|Description               |Notes        |
|---------+------+----+--------------------------+-------------|
|ADCb d   |B055DD|****|Add Carry                 |d=d+C        |
|ADD  s,d |06SSDD|****|Add                       |d=s+d        |
|ASH  s,r |072RSS|****|Arithmetic Shift          |r=r*2^s(EIS)#|
|ASHC s,r |073RSS|****|Arithmetic Shift Combined |       (EIS)#|
|ASLb d   |B063DD|****|Arithmetic Shift Left     |d=d*2        |
|ASRb d   |B062DD|****|Arithmetic Shift Right    |d=d/2        |
|BCC  a   |1030XX|----|Branch if Carry Clear     |If C=0       |
|BCS  a   |1034XX|----|Branch if Carry Set       |If C=1       |
|BEQ  a   |0014XX|----|Branch if Equal           |If Z=0       |
|BGE  a   |0020XX|----|Branch if Greater or Equal|If NxV=0     |
|BGT  a   |0030XX|----|Branch if Greater Than    |If Zv{NxV}=0 |
|BICb s,d |B4SSDD|**0-|Bit Clear                 |d=d&{~s}     |
|BISb s,d |B5SSDD|**0-|Bit Set (OR)              |d=dvs        |
|BITb s,d |B3SSDD|**0-|Bit Test (AND)            |d&s          |
|BHI  a   |1010XX|----|Branch if Higher          |If CvZ=0     |
|BHIS a   |1030XX|----|Branch if Higher or Same  |If C=0       |
|BLE  a   |0034XX|----|Branch if Less or Equal   |If Zv{NxV}=1 |
|BLT  a   |0024XX|----|Branch if Less Than       |If NxV=1     |
|BLO  a   |1034XX|----|Branch if Lower           |If C=1       |
|BLOS a   |1014XX|----|Branch if Lower or Same   |If CvZ=1     |
|BMI  a   |1004XX|----|Branch if Minus           |If N=1       |
|BNE  a   |0010XX|----|Branch if Not Equal       |If Z=1       |
|BPL  a   |1000XX|----|Branch if Plus            |If N=0       |
|BPT      |000003|----|Breakpoint Trap           |Vector at 14 |
|BR   a   |0004XX|----|Branch                    |PC=PC+2*XX   |
|BVC  a   |1020XX|----|Branch if Overflow Clear  |If V=0       |
|BVS  a   |1024XX|----|Branch if Overflow Set    |If V=1       |
|CALL d   |0047DD|----|Call subroutine           | (= JSR PC,d)|
|CCC      |000257|0000|Clear all Condition Codes |{C,N,V,Z}=0  |
|CLC      |000241|---0|Clear Carry               |C=0          |
|CLN      |000250|0---|Clear Negative            |N=0          |
|CLRb d   |B050DD|0100|Clear                     |d=0          |
|CLV      |000242|--0-|Clear Overflow            |V=0          |
|CLZ      |000244|-0--|Clear Zero                |Z=0          |
|CMPb s,d |B2SSDD|****|Compare                   |s-d          |
|COMb d   |B051DD|**01|Complement                |d=~d         |
|DECb d   |B053DD|***-|Decrement                 |d=d-1        |
|DIV  s,r |071RSS|****|Divide                    |r=r/s  (EIS)#|
|EMT  t   |1040TT|----|Emulator Trap             |Vector at 30 |
|FADD r   |07500R|**00|Floating Add              |       (FIS)#|
|FDIV r   |07503R|**00|Floating Divide           |       (FIS)#|
|FMUL r   |07502R|**00|Floating Multiply         |       (FIS)#|
|FSUB r   |07501R|**00|Floating Subtract         |       (FIS)#|
|HALT     |000000|----|Halt                      |             |
|INCb d   |B052DD|***-|Increment                 |d=d+1        |
|IOT      |000004|----|Input/Output Trap         |Vector at 20 |
|JMP  d   |0001DD|----|Jump                      |PC=d         |
|JSR  r,d |004RDD|----|Jump to Subroutine        |r=PC,PC=d    |
|MARK n   |0064NN|----|Mark stack                |RTS aid     #|
|MFPD s   |1065SS|**0-|Move From Previous Data   |            #|
|MFPI s   |0065SS|**0-|Move From Previous Instr. |            #|
|MFPS d   |1067DD|**0-|Move From Processor Status|d=PS<7:0>   #|
|MOVb s,d |B1SSDD|**0-|Move                      |d=s          |
|MTPD d   |1066DD|**0-|Move To Previous Data     |            #|
|MTPI d   |0066DD|**0-|Move To Previous Instr.   |            #|
|MTPS s   |1064SS|****|Move To Processor Status  |PS<7:0>=s   #|
|MUL  s,r |070RSS|**0*|Multiply                  |r=r*s  (EIS)#|
|NEGb d   |B054DD|****|Negate                    |d=-d         |
|NOP      |000240|----|No Operation              |             |
|RESET    |000005|----|Reset external bus        |             |
|RETURN   |000207|----|Return from subroutine    |   (= RTS PC)|
|ROLb d   |B061DD|****|Rotate Left               |d={C,d}<-    |
|RORb d   |B060DD|****|Rotate Right              |d=->{C,d}    |
|RTI      |000002|----|Return from Interrupt     |{PC,PS}=(SP)+|
|RTS  r   |00020R|----|Return from Subroutine    |PC=r,r=(SP)+ |
|RTT      |000006|----|Return from Trace trap    |No T trap   #|
|SBCb d   |B056DD|****|Subtract Carry            |d=d-C        |
|SCC      |000277|1111|Set all Condition Codes   |{C,N,V,Z}=0  |
|SEC      |000261|---1|Set Carry                 |C=1          |
|SEN      |000270|1---|Set Negative              |N=1          |
|SEV      |000262|--1-|Set Overflow              |V=1          |
|SEZ      |000264|-1--|Set Zero                  |Z=1          |
|SOB  r,a |077RNN|----|Subtract One and Branch   |PC=PC-2*NN  #|
|SPL  n   |00023N|----|Set Priority Level        |PS<7:5>=N   #|
|SUB  s,d |16SSDD|****|Subtract                  |d=d-s        |
|SWAB d   |0003DD|**00|Swap Bytes                |             |
----------------------------------------------------------------
----------------------------------------------------------------
|Mnemonic |Opcode|NZVC|Description               |Notes        |
|---------+------+----+--------------------------+-------------|
|SXT  d   |0067DD|-*0-|Sign Extend               |d=0 or -1   #|
|TRAP t   |1044TT|----|Trap                      |Vector at 34 |
|TSTb d   |B055DD|**00|Test                      |d            |
|WAIT     |000001|----|Wait for interrupt        |             |
|XOR  r,d |074RDD|**0-|Exclusive OR              |d=dxr       #|
|---------+------+----+----------------------------------------|
|         |     B|    |0 for word, 1 for byte (1 bit)          |
|         |    DD|    |Destination field (6 bits)              |
|         |     N|    |Number (3 bits)                         |
|         |    NN|    |Number (6 bits)                         |
|         |     R|    |Register (3 bits, R0-5/SP/PC)           |
|         |    SS|    |Source field (6 bits)                   |
|         |    TT|    |Number (8 bits)                         |
|         |    XX|    |Offset (8 bits, -128 to +127)           |
|----------------+----+----------------------------------------|
| PSW            |-*01|Flag unaffected/affected/reset/set      |
|                |    |Current mode (Bits 15 to 14)            |
|                |    |Previous mode (Bits 13 to 12)           |
|                |    |General register set (Bit 11)           |
|                |    |Priority level (Bits 7 to 5)            |
| T              |    |Trace trap (Bit 4)                      |
| N              |N   |Negative (Bit 3)                        |
| Z              | Z  |Zero (Bit 2)                            |
| V              |  V |Overflow (Bit 1)                        |
| C              |   C|Carry (Bit 0)                           |
|---------------------+----------------------------------------|
| r                   |Register (mode 0)                       |
| (r)                 |Register deferred (mode 1)              |
| @r                  | ditto                                  |
| (r)+                |Auto-increment (mode 2)                 |
| @(r)+               |Auto-increment deferred (mode 3)        |
| -(r)                |Auto-decrement (mode 4)                 |
| @-(r)               |Auto-decrement deferred (mode 5)        |
| nn(r)               |Index (mode 6)                          |
| @nn(r)              |Index deferred (mode 7)                 |
| #nn                 |Immediate (mode 2, r=PC)                |
| @#nn                |Absolute (mode 3, r=PC)                 |
| nn                  |Relative (mode 6, r=PC)                 |
| @nn                 |Relative deferred (mode 7, r=PC)        |
|---------------------+----------------------------------------|
| Rn                  |General purpose Register (16-bit, n=0-5)|
| SP                  |Stack Pointer (16-bit, R6)              |
| PC                  |Program Counter (16-bit, R7)            |
| PS                  |Processor Status (16-bit)               |
|---------------------+----------------------------------------|
| a                   |Relative address                        |
| b                   |Blank or B for word or byte operand(s)  |
| d   s               |Destination/source                      |
| n                   |Register number (0 to 5)                |
| nn                  |16-bit expression (0 to 65535)          |
| r                   |Register (Rn,SP,PC)                     |
| t                   |Trap number (0 to 255)                  |
| +   -   *   /   ^   |Add/subtract/multiply/divide/power      |
| &   ~   v   x       |Logical AND/NOT, inclusive/exclusive OR |
| <-  ->              |Rotate left/right                       |
| { } < : >           |Combination of operands/bit range       |
| #                   |Not applicable to all PDP-11s           |
|---------------------+----------------------------------------|
| DEC                 |Digital Equipment Corporation           |
| EIS                 |Extended fixed point Instruction Set    |
| FIS                 |Floating point Instruction Set          |
| PDP                 |Programmed Data Processor               |
| PSW                 |Processor Status Word                   |
|---------------------+----------------------------------------|
| 000                 |Reserved vector                         |
| 004                 |Time-out/system error vector            |
| 010                 |Illegal and reserved instruction vector |
| 014                 |BPT instruction vector                  |
| 020                 |IOT instruction vector                  |
| 024                 |Power fail vector                       |
| 030                 |EMT instruction vector                  |
| 034                 |TRAP instruction vector                 |
| 060                 |Console input device vector             |
| 064                 |Console output device vector            |
| 100                 |External event line interrupt vector    |
| 160000-177776       |Device addresses                        |
----------------------------------------------------------------

 


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