     Standard:

       $DE00 and $DE01 registers are active. $DF00-$DFFF contain the last page
       of the selected 8K-bank of either ROM or RAM, whatever is selected. RAM
       can only be accessed in $8000-$9FFF. ROM can be mapped to $8000, $A000 or
       $E000 with the corresponding status on GAME and EXROM.

       Note: If the AllowBank bit ($DE01, Bit 1) is not set, the $DF00-$DFFF area
       will always access bank 0 of the RAM, so the older cartridge images will
       work. The AllowBank bit does not have any effect on the ROM mirror in that
       area.

     Freeze:

       ROM is mapped to $E000-$FFFF, bank 0 is active directly after Freeze.
       Writing to bits 0 and 1 of the $DE00 register will have no effect on GAME
       and EXROM. RAM can be selected and used in $DE02 or $DF00, respectively,
       but not in $8000. Banking bits work, so you have full read access to the
       ROM, and access to up to four RAM pages with the AllowBank bit set (minus
       2 bytes if REU compatible bit is set). You should leave this memory map
       as soon as possible by setting bit 6 of $DE00 because C64 RAM in the
       $E000 area is not available, and you don't have control of the GAME and
       EXROM lines.

     REU compatible:

       $DE00 and $DE01 registers are active. $DE02-$DEFF contain a mirror of
       $9E02-$9EFF of the selected 8K-bank of either ROM or RAM, whatever is
       selected. RAM can only be accessed in $8000-$9FFF. ROM can be mapped to
       $8000, $A000 or $E000 with the corresponding status on GAME and EXROM.
       $DF00 stays free for use with the 17xx Ram Expansion Unit (REU).

       Note: If the AllowBank bit ($DE01, Bit 1) is not set, the $DF00-$DFFF area
       will always access bank 0 of the RAM, so the older cartridge images will
       work. The AllowBank bit does not have any effect on the ROM mirror in that
       area.