DIS6502 should be able to disassemble 65C02 instructions as well. There should be an option to allow it to do so or not. The latest docs can be found at Western Design Center for the W65C02S CPU. Two sets of new branch instructions consist of 4 characters. I suggest shortening them to 3 chars to comply with the normal mnemonics ( -> BS0 to BS7 and BR0 to BR7).