st9_ld:       "Load"
st9_ldw:      "Load word"
st9_ldpp:     "Load (using CSR) => (using CSR)"
st9_ldpd:     "Load (using DPRx) => (using CSR)"
st9_lddp:     "Load (using CSR) => (using DPRx)"
st9_lddd:     "Load (using DPRx) => (using DPRx)"
st9_add:      "Add"
st9_addw:     "Add Word"
st9_adc:      "Add with Carry"
st9_adcw:     "Add Word with Carry"
st9_sub:      "Substract"
st9_subw:     "Substract Word"
st9_sbc:      "Substract with Carry"
st9_sbcw:     "Substract Word with Carry"
st9_and:      "Logical AND"
st9_andw:     "Logical Word AND"
st9_or:       "Logical OR"
st9_orw:      "Logical Word OR"
st9_xor:      "Logical Exclusive OR"
st9_xorw:     "Logical Word Exclusive OR"
st9_cp:       "Compare"
st9_cpw:      "Compare Word"
st9_tm:       "Test under Mask"
st9_tmw:      "Test Word under Mask"
st9_tcm:      "Test Complement under Mask"
st9_tcmw:     "Test Word Complement under Mask"
st9_inc:      "Increment"
st9_incw:     "Increment Word"
st9_dec:      "Decrement"
st9_decw:     "Decrement Word"
st9_sla:      "Shift Left Arithmetic"
st9_slaw:     "Shift Word Left Arithmetic"
st9_sra:      "Shift Right Arithmetic"
st9_sraw:     "Shift Word Right Arithmetic"
st9_rrc:      "Rotate Right through Carry"
st9_rrcw:     "Rotate Word Right through Carry"
st9_rlc:      "Rotate Left through Carry"
st9_rlcw:     "Rotate Word Left through Carry"
st9_ror:      "Rotate Right"
st9_rol:      "Rotate Left"
st9_clr:      "Clear Register"
st9_cpl:      "Complement Register"
st9_swap:     "Swap Nibbles"
st9_da:       "Decimal ajust"
st9_push:     "Push on System Stack"
st9_pushw:    "Push Word on System Stack"
st9_pea:      "Push Effective Address on System Stack"
st9_pop:      "Pop from System Stack"
st9_popw:     "Pop Word from System Stack"
st9_pushu:    "Push on User Stack"
st9_pushuw:   "Push Word on User Stack"
st9_peau:     "Push Effective Address on User Stack"
st9_popu:     "Pop from User Stack"
st9_popuw:    "Pop Word from User Stack"
st9_link:     "Move System Stack Pointer upward; support for high-level language"
st9_unlink:   "Move System Stack Pointer backward; support for high-level language"
st9_linku:    "Move User Stack Pointer upward; support for high-level language"
st9_unlinku:  "Move User Stack Pointer backward; support for high-level language"
st9_mul:      "Multiply 8x8"
st9_div:      "Divide 8x8"
st9_divws:    "Divide Word Stepped 32/16"
st9_bset:     "Bit Set"
st9_bres:     "Bit Reset    "
st9_bcpl:     "Bit Complement"
st9_btset:    "Bit Test and Set"
st9_bld:      "Bit Load"
st9_band:     "Bit AND"
st9_bor:      "Bit OR"
st9_bxor:     "Bit XOR"
st9_ret:      "Return from Subroutine"
st9_rets:     "Inter-segment Return to Subroutine"
st9_iret:     "Return from Interrupt"
st9_jrcc:     "Jump Relative if Condition ``cc'' is Met"
st9_jpcc:     "Jump if Condition ``cc'' is Met"
st9_jp:       "Unconditional Jump"
st9_jps:      "Unconditional Inter-segment Jump"
st9_call:     "Unconditional Call"
st9_calls:    "Inter-segment Call to Subroutine"
st9_btjf:     "Bit Test and Jump if False"
st9_btjt:     "Bit Test and Jump if True"
st9_djnz:     "Decrement a Working Register and Jump if Non Zero"
st9_dwjnz:    "Decrement a Register Pair and Jump if Non Zero"
st9_cpjfi:    "Compare and Jump on False  Otherwise Post Increment"
st9_cpjti:    "Compare and Jump on True  Otherwise Post Increment"
st9_xch:      "Exchange Registers"
st9_srp:      "Set Register Pointer Long (16 working registers)"
st9_srp0:     "Set Register Pointer 0 (8 LSB working registers)"
st9_srp1:     "Set Register Pointer 1 (8 MSB working registers)"
st9_spp:      "Set Page Pointer"
st9_ext:      "Sign Extend"
st9_ei:       "Enable Interrupts"
st9_di:       "Disable Interrupts"
st9_scf:      "Set Carry Flag"
st9_rcf:      "Reset Carry Flag"
st9_ccf:      "Complement Carry Flag"
st9_spm:      "Select Extended Memory addressing scheme through CSR Register"
st9_sdm:      "Select Extended Memory addressing scheme through DPR Registers"
st9_nop:      "No Operation"
st9_wfi:      "Stop Program Execution and Wait for the next Enable Interrupt"
st9_halt:     "Stop Program Execution until System Reset"