From: guidero@gmail.com   
      
   On Saturday, October 8, 2022 at 12:39:22 PM UTC-7, MG wrote:   
   > To understand how it's addressed, we go back to the original Apple IIe. The   
   Apple IIe memory map itself is somewhat complicated. In a stock machine with   
   no expansion there is 64K of memory, which (up to) 56K is visible at any given   
   time. The extra 4K    
   is switchable into $D000-$DFFF, allowing access to the full 64K. This   
   precedent was set by the Apple II/II+ (48K) with a 16K expansion. The memory   
   can be selected for write-only (reads come from ROM), read-only, or   
   read+write.    
      
   Bah, up to 60K, not 56K :-)   
      
   MG   
      
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