The MOS 6567/6569 video controller (VIC-II)
and its application in the Commodore 64
Contents
3. Description of the VIC
3.7. Text/bitmap display
3.7.3. Graphics modes
3.7.3.8. Invalid bitmap mode 2 (ECM/BMM/MCM=1/1/1)
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The last invalid mode also creates a black screen but it can also be "scanned" with sprite-graphics collisions.

The structure of the graphics is basically as in multicolor bitmap mode, but the bits 9 and 10 of the g-addresses are always zero due to the set ECM bit, with the same results as in the first invalid bitmap mode. As usual, the bit combination "01" is part of the background.

c-access

Adresses
13 12 11 10 9 8 7 6 5 4 3 2 1 0
VM13 VM12 VM11 VM10 VC9 VC8 VC7 VC6 VC5 VC4 VC3 VC2 VC1 VC0

Data
11 10 9 8 7 6 5 4 3 2 1 0
unused

g-access

Adresses
13 12 11 10 9 8 7 6 5 4 3 2 1 0
CB13 VC9 VC8 0 0 VC5 VC4 VC3 VC2 VC1 VC0 RC2 RC1 RC0

Data
7 6 5 4 3 2 1 0
4 pixels (2 bits/pixel)

"00": Black (background)
"01": Black (background)
"10": Black (foreground)
"11": Black (foreground)