ND-1xx Instructions

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

• STZ – Store zero
• STA – Store A
• STT – Store T
• STX – Store X
• MIN – Memory increase, skip if zero

Load Instructions

• LDA – Load A
• LDT – Load T
• LDX – Load X

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

• LDD – Load double word
• STD – Store double word

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

• BFILL – Byte fill
• MOVB – Move bytes
• MOVBF – Move bytes forward
• SBYT – Store byte
• LBYT – Load byte

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

• TRA – Transfer to A register
• TRR – Transfer to register

Inter-level Instructions

• IRR – Inter Register Read
• IRW – Inter Register Write

Register Operations

Index register operation

• MIX3 – Multiply index by 3

Arithmetic Operations, RAD=1:

• RADD – Register addition
• RSUB – Register subtraction
• COPY – Register transfer

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:

• RMPY – Integer inter-register multiply
• RDIV – Integer inter-register divide

Floating Conversion

• NLZ – Normalize (integer to floating)
• DNZ – Denormalize (floating to integer)

Memory Examine/Deposit Instructions

• EXAM – Memory examine
• DEPO – Memory deposit

Sequencing Instructions

Unconditional Jump

• JMP – Jump
• JPL – Jump to subroutine

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

• INIT – Initialize stack
• ENTR – Enter stack
• LEAVE – Leave stack
• ELEAV – Error leave stack

Additional instructions in the CX option

The CX instructions include the CE instructions in improved versions, plus the following CX-only instructions:

• MOVEW – Move block of words
• TSET – Test and set
• RDUS – Read don't use cache

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

• GECO
• IOT

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)