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   comp.sys.cbm      Discussion about Commodore micros      53,866 messages   

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   Message 53,241 of 53,866   
   K-Guide to All   
   Re: Why $0401, $0801, $1c01? Why not $04   
   14 Feb 21 08:10:06   
   
   From: nospam.K-Guide@f230.n130.z1.fidonet.org   
      
   On Fri 12-Feb-2021  7:27a, Pzembrod@gmail.com@3:770/3.0 wrote:   
   P> I figure that someone here probably knows why CBM's basic RAM always   
   P> started at $xx01 addresses, like $0801, $0401, $1001, $1c01 instead of   
   P> $0800, $0400, $1000, $1c00?   
      
   P> What is sitting in that one byte, or what role is it playing?   
      
   I am not sure about the other systems, but on the C64 the Byte at $800   
   indicates your intention to use the following bank for Basic.  If you store   
   anything other that 0 in that Byte, then Basic programs will not run.   
      
   [+] K-Guide   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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