AUX memory question

[Dennis Jenkins <dennis@uranium.usb.com>]

Hello,
	I know that I can use the soft switches $c002 through $c005 to
control if an I going to read or write to the 48K main/aux memory, but how
do I gain access to the upper 16K of AUX memory (and then re-gain access 
to the upper 16K of normal memory)?  I think the answer in the the address 
range of $c080 through $c08f, but I don't understand what each of those 
soft switches _really_ does.  I know that ProDOS lives in one of those 
upper banks, and I have to be careful not to trash it.

	(I know about the AUXMOVE API found at $c311.  That isn't exactly
what I want.  I need faster access to AUX memory, as I am using it to
store hash tables.  AUXMOVE is way to slow.  I am writing my own custom
AUX memory access functions.  I store them in the upper part of zero page.  
My code has nothing to do with BASIC.SYSTEM, so I'm not worried about
basic trashing my work areas.)

	I currently have working code that lets me read/write single bytes
(at a time, exactly what I want) to AUX range $0200 through $bfff.  I want 
to be able to handle $c000 through $fffc.  Can I safely write random data 
to AUX $fffe,$ffff?  I am not bothering to write to AUX $0000 through 
$01ff.