Assembly language program

what is machine code

the programming language that the CPU uses

what are instructiosn in ALP

a single operation performed by a CPU

what is assembly language

a low-level chip/machine specific programming languages that uses mnemonics

what is opcode short for

operation code

what is opcode

the part fo machine code instruction that identifies the action the CPU will perform

what is operand

the part fo a machien code instruction that identifies the data to be used by the CPU

what is source code

a computer program before tranlation into machine code

what is an assembler

a computer program that translates programming code written in assembly language into machine code

what are instruction sets

the complete set of machine code instructions used by a CPU

what is object code

a computer program after translation into machine code

what are addressing modes

different methods of using the operand part of a machine code instruction as memory address

what is absolute addressing

mode fo addressign in which the contenst of the memory location in the operand are used

what is direct addressing

mode of addressign in which the content of the memory location in the operand are used

what is indirect addressing

mode of addressign in which the contents of the contents of the memory location in the operand are used

what is indexed addressing

mode of addressing in which the content of the memory location found by addign the contents of the index register to the address of the memory location in the operand are used

what is immediate addressing

mode of addressing in which the value of the operand only is used

what is relative addressing

mode of addressing in which the memory address used is the current memory address added to the operand

what is symbolic addressing

mode of addressing used in assembly language programming, where a label is used instead of a value

Opcode: LDM Operand: #n | what does it do

load the numebr in ACC

Opcode: LDD Operand: <address>| what does it do

load the content of the specific address into ACC

Opcode: LDI Operand: <address> | what does it do

the address to be used is the contents of the specified address. Load the contents of the contents of the given address into ACC

Opcode: LDX Operand: <address>| what does it do

the address to be used is the specifed address plus the contents fo the index register. Load the contents of the calculated address into ACC

Opcode: LDR Operand: #n | what does it do

Load the number n into IX

Opcode: LDR Operand: ACC| what does it do

load the number in the accumulator into IX

Opcode: MOV Operand: <register>| what does it do

move the contents of the accumulator to the register

Opcode: STO Operand: <address>| what does it do

store the contents of ACC into the specifieid address

Opcode: END Operand: … | what does it do

return control to the operating system

what is ACC

single accumulator

what is IX

index register

what does B represent

binary number

what does & represent

hexadecimal number

what does # represent

denary number

Opcode: IN Operand: … | what does it do

key in a character and store its ASCII value in ACC

Opcode: OUT Operand: | what does it do

output to the screen the character whose ASCII value stored in ACC

Opcode: ADD Operand: <address> | what does it do

add the contents of the specified address to the ACC

Opcode: ADD Operand: #n | what does it do

add the denary number n to the ACC

Opcode: SUB Operand: <address> | what does it do

subtract the contents of the specified address from the ACC

Opcode: SUB Operand: #n | what does it do

subtract the number n from the ACC

Opcode: INC Operand: <register> | what does it do

add 1 to the contents of the register

Opcode: DEC Operand: <register> | what does it do

subtract 1 from the contents of the register

Opcode: JMP Operand: <address> | what does it do

jump to specified address

Opcode: JPE Operand: <address> | what does it do

following a compare instruction, jump to the specified address if the comparison is true

Opcode: JPN Operand: <address> | what does it do

following a compare instruction, jump to the specified address if the comparision is false

Opcode: CMP Operand: <address> | what does it do

compare the contents of ACC with the contents of the specified address

Opcode: CMP Operand: #n | what does it do

compare the contens of ACC with the number n

Opcode: CMI Operand: <address> | what does it do

the address to be used is the contents of the specified address

what kind of directing mode is LDM #n

immediate address

directing LDD <address>

direct or absolute address is used

LDI addressing is used

<address>

what is data movement instructions

allows data stored at one location to be copied into accumulator