Apple2 Asm: current cursor y pos.?

Hi!  I am working on a WIP text adventure for the C64 and Plus4 and want to port it to the Apple2enh.  The text adventure updates a scoreboard on the top of the screen every time it asks for input.  It is written in cc65 C.  Before it prints the scoreboard, it has to preserve the initial Y pos.  I know I can just use wherey() but want a more efficient method, as I'm also working on and using A2SimpleIO.  I checked through my Apple2 documentation quickly and didn't find it.  Right now, I just need the address of the variable that holds the cursor Y pos but want a full map of the Apple2's memory usage.  Where can I get one?