Department of Computer Science

PDP-11 Processor Handbook

Instruction Format Summary

1. Single Operand Group (CLR, CLRB, COM, COMB, INC, INCB, DEC, DECB, NEG, NEGB, ADC, ADCB, SBC, SBCB, TST, TSTB, ROR, RORB, ROL, ROLB, ASR, ASRB, ASL, ASLB, JMP, SWAB, MFPS, MTPS, SXT, XOR)
   

2. Double Operand Group (BIT, BITB, BIC, BICB, BIS, BISB, ADD, SUB, MOV, MOVB, CMP, CMPB)
   

3. Program Control Group
   1. Branch (all branch instructions)
      

   2. Jump To Subroutine (JSR)
      

   3. Subroutine Return (RTS)
      

   4. Traps (break point, IOT, EMT, TRAP, BPT)
      

   5. Mark (MARK)
      

   6. Subtract 1 and branch (if=0)(SOB)
      

4. Operate Group (HALT, WAIT, RTI, RESET, RTT, NOP)
   

5. Condition Code Operators (all condition code instructions)
   

6. Fixed and Floating Point Arithmetic (optional EIS/FIS) (FADD, FSUB, FDIV, MUL, DIV, ASH, ASHC)