All help appreciated - thanks, I'm learning. And since you ask, I'm in England.

My actual spend was below £200 (roughly $235) but I got two L3+ and four D3 - apologies, I was not clear about that. Can they become viable if used together in some way?

I think these miners are new old stock - all boxed, look unused, one D3 not opened, one opened by me to check for paperwork (found a one sheet quick start guide) - and it did occur to me that using them as heaters might help, but I need better ideas than what I have come up with so far.

I'm at a loss where I should be posting on here, so if this gets moved I shall not be disconcerted.

Lookit, I went to an auction and bought some miners - Bitmain Antminers, D3, L3+, T9. I know enough to know that I got them cheap, but I didn't get any paperwork or instructions with them. It didn't occur to me that they were not economically viable, and that was why they were being sold.

I didn't get any power supplies with them. What I see on the www is reviews indicating that they eat more juice than the bitcoin they produce, in cash terms.
So before I shell out for power supplies - is it a good idea to work these things? Can I perhaps get a better return mining other currencies than bitcoin?

So I need suggestions. Hopefully, nothing to do with where the monkeys put the nuts.

Can these things make money? If so -
What are reasonable suggestions for power supplies, and then what should I do (apart from putting them on eBay so the vultures can make a profit)?  Should I be looking for novel software?

I was a reasonably able C programmer once (somewhere around 1990) so I'm not afraid of fiddling with code, although burglars deprived me of my libraries and knowledge base books a long time ago.

All help appreciated with deep joy!