TAX

TAX (short for "Transfer Accumulator to X") is the mnemonic for a machine language instruction which transfers ("copies") the contents of the accumulator to the X index register.

Addressing mode

Opcode		Addressing mode	Assembler format	Length in bytes	Number of cycles
Dec	Hex
170	AA	Implied	TAX	1	2

TAX only supports the Implied addressing mode, as shown in the table at right.

CPU flags

TAX affects 2 of the CPU's status flags:

• The negative status flag is set if the byte transferred is negative, i.e. has it's most significant bit set.
• The zero flag is set if the byte transferred is zero, or cleared if it is non-zero.