As far as I know, there is no active connection to the Isa slots without a bridgeboard. I used to comtemplate buying a bridgeboard but my A2000s are now dedicated graphics machines and for what a 386 or Golden Gate card costs these days, I'd rather get a flicker fixer or something more practical for my money. A bigger memory card--like a supra 8 mb card--would help your system a lot. One of the pains of the A2000 is that you only have 8mb of Zorro II ram possible and bridge boards and some RTG cards will use some of this memory space and severely limit the memory unless you buy an accelerator with 32 bit memory expansion--preferebly in the form of 30 or 72 pin simms. Zip ram is also a rare and pricey commodity these days as are GVP simms.
And I didn't notice you were in Norway which puts a different perspective on the price you paid. Here in the US, there are a lot of A2000s around for good prices but I'm not so sure about Norway.