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Signature Byte
From SnesLab
(Redirected from signature byte)
A Signature Byte is the second byte of certain two-byte 65x instructions:
None of these instructions are considered to use immediate addressing even though the signature byte immediately follows the opcode.
Reference
- 7.22 BRK Instruction on page 53 of 65c816 datasheet: https://www.westerndesigncenter.com/wdc/documentation/w65c816s.pdf