[stella] 3F Bankswitching Question

["Chris Larkin" <clarkin@xxxxxxxxxxxxx>]

This one is interesting....

 

The ROM is split up into four 2k "Banks" you select which of the four you want by loading the bank you want into the accumulator (0 to 4) and then storing the accumulator to $3F.

 

Here is where I get stuck?  How does the cartridge get what you are writing to $3F????

 

Where is the 2k of selected ROM stored?

 

F000->F7FF

or

F800->FFFF

 

Why can't the entire 4k bank be loaded here? what's the other 2k for?

 

Anyone????

 

--Chris