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base:memory_management [2018-05-29 07:35] – white_flamebase:memory_management [2019-04-10 03:12] – changed start of ram from 0000 to 0002 white_flame
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 |CHAREN|2|$D000-DFFF|CHARROM|I/O|If HIRAM and LORAM are both set to 0, then this bit is ignored and the area also maps to RAM. This allows for 3 mappings of this region: RAM, CHARROM, or I/O.| |CHAREN|2|$D000-DFFF|CHARROM|I/O|If HIRAM and LORAM are both set to 0, then this bit is ignored and the area also maps to RAM. This allows for 3 mappings of this region: RAM, CHARROM, or I/O.|
  
-  * All other memory locations ($0000-9FFF, $C000-CFFF) always map to RAM.+  * All other memory locations ($0002-9FFF, $C000-CFFF) always map to RAM.
   * Writes to a ROM-mapped region are applied to the underlying RAM at the same address.   * Writes to a ROM-mapped region are applied to the underlying RAM at the same address.
 +  * I/O includes the registers for the VIC-II, SID, and CIA chips; color RAM; and two external I/O pages that reach out the expansion port.
   * The VIC-II always sees the CHARROM at $1000-1FFF and $9000-9FFF, and RAM everywhere else, regardless of these bits.   * The VIC-II always sees the CHARROM at $1000-1FFF and $9000-9FFF, and RAM everywhere else, regardless of these bits.
  
base/memory_management.txt · Last modified: 2022-04-17 05:36 by white_flame