1. mouse: the DB9 apple II mouse is not compatible with a
"generic" DB9 mouse? does it need an adapter?
2. is the ISA slots compatible with a generic ISA card, so that its just a ____ question of drivers to make any ISA card work?
3. follow up to question 2 - are there any drivers for common ISA ethernet
____ cards like the 3c509 or the NE2000 ?
thx, capybara 
I've not tried one, but it's unlikely to be compatible. I see old Apple DB9 mice on eBay regularly.
They aren't ISA slots. They are specific to the Apple II line.
No, not at all. Neither the cards nor the software would run on an Apple II.
The Apple II slot predates ISA by about 4 to 5 years.
Considering how simple 8 bit ISA is one wonders if an adapter could be hacked up. I mean you can use ISA cards with PICs and other microcontrollers