I am working with a W65C02S chip and it has extra opcodes,
BBSn that branch on a bit set, or bit reset. However, I cannot find on which register or memory location this check is done.
When looking for more info on these opcodes, I found this from 6502.org. But that is talking about an extra addressing mode
zp,rel, which is not talked about at all in the W65C02S datasheet. The datasheet says these opcodes use the
r (relative) addressing mode.
I would assume
BBSn use the accu, but can someone confirm?