Maybe he was asking this question. Said dual mining and meant merged
I think he is referring to dual mining as in GPU dual mining, which is not possible as far as ASIC miners are a concern, OP you must understand that the way a GPU works and an ASIC miner like the M21s works are pretty different, you can't use a certain resource of your ASIC to mine x algo and the other resources to mine another algo, so Dual mining as the one ETH is known for is a no-go here.
The alternative way of dual mining (although one could argue that is called merged and not dual) would be "mining" coins that utilize Bitcoin Blockchain in the means of auxiliary blockchain, where the POW that is done on the so-called "parent" chain which is
BTC blockchain are considered valid work on the auxiliary/child blockchain, that coin needs to 1. Be based on SHA-256 algorithm and 2. Supports this auxiliary proof of work thing.
I assume coins mentioned by both members above qualify for those 2 rules.
Mined BTC and get 2 NMC, 5 SYS, 0.1 EMC, 1 ELA for FREE
Additionally, I highly doubt this can be done on your miner software level, the pool has to do it and give you the rewards for that, so you can't say mine BTC at ckpool and mine SYS coin at Nanopool for an instance, it is also worth mentioning that the rewards you get from those coins are pretty worthless, the good part, unlike Dual mining with GPUs this does not make your miner consume more power.
