The floppy connector is next to where the floppy cable goes (on your mobo)
If you are using a Power Tower, just use one of the floppy connectors that are in the PSU and connect it to your A1200 mobo, to where the floppy drive would be connected. I assume you have your floppy drive receiving power from other PSU cable...so that leaves the floppy connector in your mobo free... (hope you understand this since english inst my native languague...)
As for the red/black cables...i think they are for a speaker or something?
Cant remember for sure and im not at my house now, so i cant check on my Tower
I can post that info later for you, together with some pics
Regards and i hope my little advice helps you
Let us know
Sebastian