Description of the various drawing modes :

RPLC

Completely RePLaCes the destination (clearing it before is useless). You should use this mode to display a background.

OR

Logical OR between the source and the destination.

MASK

This mode is particular. In black and white functions, it's totally the same as the AND mode. In grayscale, it realizes a logical AND between the first plane of the source big_vscreen, and the both planes of the destination (so you can pass a black and white big_vscreen, since only the first plane is used).
This mode is very useful to draw several planes on the screen without losing a color (by drawing next a plane using the OR mode). The example 5 shows a way to use this mode.

TRANW

The White color is TRANsparent, the other colors are opaque. This mode is very useful to draw planes over a background.

TRANB

The Black color is TRANsparent, the other colors are opaque. This mode is very useful to draw planes over a background.

Table summarizing the different plane types:

(elements of type TM_Type and TM_GType)

	2D char arrays		2D short arrays
	8x8 sprites	16x16 sprites	8x8 sprites	16x16 sprites
B/W	TM_8B	TM_16B	TM_8W	TM_16W
Grayscales	TM_G8B	TM_G16B	TM_G8W	TM_G16W

Table summarizing the different animated plane types:

(elements of type TM_AnimType and TM_GAnimType)

	2D char arrays		2D short arrays
	8x8 sprites	16x16 sprites	8x8 sprites	16x16 sprites
B/W	TM_A8B	TM_A16B	TM_A8W	TM_A16W
Grayscales	TM_GA8B	TM_GA16B	TM_GA8W	TM_GA16W

Table summarizing the different plane types for the DrawTiles functions

(element of type TM_TilesType and TM_GTilesType)

		2D char arrays		2D short arrays
		8x8 Sprites	16x16 Sprites	8x8 Sprites	16x16 Sprites
B/W	TI92+	TM_T8B	TM_T16B	TM_T8W	TM_T16W
	TI89	TM_T8B89	TM_T16B89	TM_T8W89	TM_T16W89
Grayscales	TI92+	TM_GT8B	TM_GT16B	TM_GT8W	TM_GT16W
	TI89	TM_GT8B89	TM_GT16B89	TM_GT8W89	TM_GT16W89

Table summarizing the different drawing modes

(elements of type TM_Mode and TM_GMode)

		RPLC	OR	MASK	TRANW	TRANB
B/W	TI92+	TM_RPLC	TM_OR	TM_MASK
	TI89	TM_RPLC89	TM_OR89	TM_MASK89
Grayscales	TI92+	TM_GRPLC	TM_GOR	TM_GMASK	TM_GTRANW	TM_GTRANB
	TI89	TM_GRPLC89	TM_GOR89	TM_GMASK89	TM_GTRANW89	TM_GTRANB89