The ROM IMAGE in the above table refers to the character generator ROM. It appears in place of RAM at the above locations in bank 0. it also appears in the corresponding RAM at locations 36864-40959 ($9000-$9FFF) in bank 2. Since the VIC-II chip can only access 16K of memory at a time, the ROM character patterns appear in the 16K block of memory the VIC-II chip looks at. Therefore, the system was designed to make the VIC-II chip think that the ROM characters are at 4096-8191 ($1000-$1FFF) when your data is in bank 0, and 36864-40959 ($9000-$9FFF) when your data is in bank 2, even though the character ROM is actually at location 53248-57343 ($D000-$DFFF). This imaging only applies to character data as seen by the VIC-II chip. It can be used for programs, other data, etc., just like any other RAM memory.

NOTE: If these ROM images got in the way of your own graphics, then set the BANK SELECT BITS to one of the BANKS without the images (BANKS 1 or 3). The ROM patterns won't be there.

The location and contents of the character set in ROM are as follows:

BLOCK	ADDRESS		VIC-II IMAGE	CONTENTS
	DECIMAL	HEX
0	53248	D000-D1FF	1000-11FF	Upper case characters
	53760	D200-D3FF	1200-13FF	Graphics characters
	54272	D400-D5FF	1400-15FF	Reversed upper case characters
	54784	D600-D7FF	1600-17FF	Reversed graphics characters
1	55296	D800-D9FF	1800-19FF	Lower case characters
	55808	DA00-DBFF	1A00-1BFF	Upper case & graphics characters
	56320	DC00-DDFF	1C00-1DFF	Reversed lower case characters
	56832	DE00-DFFF	1E00-1FFF	Reversed upper case & graphics characters

Sharp-eyed readers will have just noticed something. The locations occupied by the character ROM are the same as the ones occupied by the VIC-II chip control registers. This is possible because they don't occupy the same locations at the same time. When the VIC-II chip needs to access