Ahaa, I have right now at home 2 controllers, each one with two separate "port" so it is 2x2x2 devices. Address space should not be problem, but You may easy have lack of free IRQ's. Even then, when using shared IRQ's for disk controler OS/2 and eCS can use all drives with speed sometimes much lower and CPU usage is offten much higher than on exclusive IRQ's. On for example ctGUI/Valknut usage You will not notice any problem even when both controler share same IRQ, but on video capture performace may be much reduced or even been useless. Recomendation is that controler should not share IRQ with other controler, but with any other cards. And while Windows systems try to manage resource independent from BIOS, it is good to manage BIOS to have not conflict and if possible shared resources before booting OS/2 or eCS. Then, using Dani's drivers isn't necessary to specify anything.