Yamaha V9938 Programmer's Manual page 11

and when coding RGB in GRAPHIC 7 mode red and green occupy 3 bits each, but blue
occupies only 2 bits
T
Tile
font pattern
Same as
V
VRAM
Video Random Access Memory is a set of memory cells used by VDP to keep information
about picture displayed on the screen. VRAM is accessed for picture displaying purposes as
well as for picture modifications. Picture displaying occurs continuously when VDP is
enabled. V9938 may have 16K to 128K VRAM, and depending on the memory organization
and size may not be able to function properly in specific modes. See description of register
R#8's bit VR for more information
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