Models with S/N typically less than 6000 support only 4 colors, black, white, green, violet. And there is no color-killer circuit so all text is fringed. This is a revision 0 board.
Revision 1 boards gave you two more colors, blue and orange. A total of 8 hi-res colors in all if you counted "black 2" and "white 2". Black 2 and White 2 allowed for more artifacting and such, but at the cost of resolution.