ND-1xx Instructions

Instruction Set

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 (C may also be affected)
• FSB – Subtract from floating accumulator (C may also be affected)
• FMU – Multiply floating accumulator (C may also be affected)
• FDV – Divide floating accumulator (Z and C 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

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

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

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
• 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

Arithmetic Operations, RAD=1:

C,O,Q may be affected by the following operations

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

Subinstruction

• 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

Subinstruction

• CLD – Clear destination register before operation
• CM1 – Use complement (one's 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 –
• DNZ –

Memory Examine/Deposit Instructions

• EXAM –
• DEPO –

Sequencing Instructions

Unconditional Jump

• JMP –
• JPL –

Conditional Jump

• JAP –
• JAN –
• JAZ –
• JAF –
• JXN –
• JPC –
• JNC –
• JXZ –

Skip Instructions

• SKIP –

Sources

• Norsk Data Document ND–06.014 ND-100 REFERENCE MANUAL (ND-06.014.02 rev A)
• Norsk Data Document ND–99.005 ND-100 INSTANT INSTRUCTION CODES (ND-99.005.02 12/84)