How does Ethernet device know address of transfer buffer

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Hi,

I can successfully install the 3c905 Ethernet driver, 
but I don’t know why it works. This proves I don’t know 
what is going on. I hope that someone can offer some 
light.

I use install parameters “irq=11" and I don’t set an io 
address. If I try fill in the address e.g. “io=0x220" I 
receive an error the param_io is invalid.

Don’t the irq number and the address of the buffer go 
together? Doesn’t the os put data in a buffer before 
sending, and then make in interrupt to tell the hardware 
to come get it?

Can someone tell me where the buffer is and how linux 
and the hardware agree on its address?

Gary Setter