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Opcodes and Operand Fields
Tabs are used to separate assembler fields.
The opcode field generally starts at least one tab over from the left margin.
The operand field must be separated from the opcode field by at least one space or tab.
Some assemblers interpret any text that starts in column 1 as a label. For this reason, you should always use the tab key to offset the opcode, so that it is not mistaken for a label..
An 8 space tab setting generally works well for assembly language programming.