ND-1xx Instructions
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See also: ND-1xx Instructions Sorted Numerically
Instruction Set
NORD-10/ND-100/ND-120 instructions are all exactly 16 bits (1 word) long. Addressing mode, displacement, source register, destination register are, when applicable, encoded inside the 16-bit instruction word itself.
Memory Reference Instructions
Store Instructions
Load Instructions
Arithmetic and Logical Instructions
- ADD – Add to A (C, O and Q may also be affected)
- SUB – Subtract from A (C, O and Q may also be affected)
- AND – Logical AND to A
- ORA – Logical inclusive OR to A
- MPY – Multiply integer (O and Q may also be affected)
Double Word Instructions
Floating Instructions
- LDF – Load floating accumulator
- STF – Store floating accumulator
- FAD – Add to floating accumulator (TG may also be affected)
- FSB – Subtract from floating accumulator (TG may also be affected)
- FMU – Multiply floating accumulator (TG may also be affected)
- FDV – Divide floating accumulator (Z and TG may also be affected)
Byte Instructions
Execute Instruction
- EXR – Execute instruction found in specified register
Argument Instructions
- AAA – Add argument to A
- AAB – Add argument to B
- AAT – Add argument to T
- AAX – Add argument to X
- SAA – Set argument to A
- SAB – Set argument to B
- SAT – Set argument to T
- SAX – Set argument to X
Bit Instructions
- BSKP – Skip next location if specified condition is true
- BSET – Set specified bit equal to specified condition
- BSTA – Store and clear K
- BSTC – Store complement and set K
- BLDA – load K
- BLDC – Load bit complement to K
- BANC – Logical AND with bit complement
- BORC – Logical OR with bit complement
- BAND – Logical AND to K
- BORA – Logical OR to K
Shift Instructions
- SHT – Shift T register
- SHD – Shift D register
- SHA – Shift A register
- SAD – Shift A and D registers connected
Subinstructions (Types)
For each shift instruction, one of the following types can be specified
- nil (default) Arithmetic shift
- ROT – Rotational shift
- ZIN – Zero end input
- LIN – Link end input
Subinstructions (Direction)
- nil (default) Left shift
- SHR – Right shift
System Control Instructions
- IOF – Interrupt system off
- ION – Interrupt system on
- LWCS – Load Writeable Control Store
- MON – Monitor Call
- PIOF – Memory management and interrupt system off
- PION – Memory management and interrupt system on
- POF – Memory management off
- PON – Memory management on
- REX – Reset extended address mode
- SEX – Set extended address mode
- WAIT – Wait (give up priority)
- OPCOM – Operator's Communication Code
Transfer Instructions
Load Independent Instructions
Inter-level Instructions
Register Operations
Index register operation
- MIX3 – Multiply index by 3
Arithmetic Operations, RAD=1:
Subinstructions
- AD1 – Also add 1 to destination
- ADC – Also add old carry to destination
Logical Operations, RAD=0:
- SWAP – Register exchange
- RAND – Register logical AND
- REXO – Register logical exclusive OR
- RORA – Register logical OR
Subinstructions
- CLD – Clear destination register before operation
- CM1 – Use complement (ones' complement) of source register as operand.
Combined Instructions:
- EXIT – Return from subroutine
- RCLR – Register clear
- RINC – Register increment
- RDCR – Register decrement
Extended Arithmetic Operations:
Floating Conversion
Memory Examine/Deposit Instructions
Sequencing Instructions
Unconditional Jump
Conditional Jump
- JAP – Jump if A register is positive or zero
- JAN – Jump if A register is negative
- JAZ – Jump if A register is zero
- JAF – Jump if A register is filled (not zero)
- JXN – Jump lf X register is negative
- JXZ – Jump if X register is zero.
- JPC – Count and jump if X register is positive or zero.
- JNC – Count and jump if X register is negative.
Skip Instructions
- SKP – Skip next instruction if specified condition is true
Subinstructions (Specified condition)
- EQL – Equal
- GEQ – Signed greater or equal to (owerflow not OK)
- GRE – Signed greater or equal to (owerflow OK)
- MGRE – Magnitude greater or equal to
- UEQ – Unequal to
- LSS – Signed less than (owerflow not OK)
- LST – Signed less than (owerflow OK)
- MLST – Magnitude less than
Dummys (may be used to obtain easy readability)
- IF
- 0
Additional instructions in the CE (Commercial Extended) option
Decimal Instructions
- ADDD – Add decimal
- SUBD – Subtract decimal
- COMD – Compare decimal
- SHDE – Decimal shift
- PACK – Convert to packed decimal
- UNPACK – Convert to unpacked decimal
Stack Handling Instructions
Additional instructions in the CX option
The CX instructions include the CE instructions in improved versions, plus the following CX-only instructions:
SINTRAN-III Segment Change Instructions
- SETPT – Set page tables
- CLEPT – Clear page tables
- CLNREENT – Clear non reentrant
- CHREENTPAGES – Change not reentrant pages
- CLEPU – Clear page tables, collect PGU information
New SINTRAN instructions in ND-110
- CLPT Clear segment from page tables
- CNREK Clear non re-entrant pages
- ENPT Enter segment in page tables
- INSPL Insert page in page list
- REMPL Remove page from page list
- REPT Enter re-entrant segment in page tables
Undocumented instructions
Sources
- Norsk Data Document ND–06.014 ND-100 REFERENCE MANUAL (ND-06.014.02 rev A)
- Norsk Data Document ND–06.029 ND-110 Instruction Set (ND-06.029.01 rev A)
- Norsk Data Document ND–99.005 ND-100 INSTANT INSTRUCTION CODES (ND-99.005.02 12/84)