Relation between screen mode and logical BG in SCREEN instruction

---

Screen mode	Logic BG0 Bit map	Logic BG1 Bit map	Logic BG2 Bit map	Logic BG3	Logic BG4 Character	Logic BG5 Character	Logic BG6 Character	Logic BG7 Character	Logic BG8 Character	Logic BG9 Character
0	32768 colors 512×256 Scroll Zoom				512 colors 128×128 Scroll Zoom	512 colors 128×128 Scroll
1	256 colors 512×256 Scroll Zoom	256 colors 512×256 Scroll Zoom			512 colors 128×128 Scroll	512 colors 128×128 Scroll
2					512 colors 128×128 Scroll Zoom	512 colors 128×128 Scroll Zoom			512 colors 256×256 Z axis rotation
3			256 colors 512×256 Z axis rotation		512 colors 128×128 Scroll Zoom	512 colors 128×128 Scroll Zoom
4					256 colors 128×128 Scroll Zoom	256 colors 128×128 Scroll Zoom	256 colors 128×128 Scroll	256 colors 128×128 Scroll
5					512 colors 128×128 Scroll Zoom	512 colors 128×128 Scroll Zoom			512 colors 256×256 Three axis rotation
6					512 colors 128×128 Scroll Zoom	512 colors 128×128 Scroll Zoom			512 colors 128×128 Three axis rotation	512 colors 128×128 Three axis rotation

---

Note 1. It is necessary to execute WINDOW 0 and 0,511,255 for the bit map side to read and write it by the full size.

Note 2. The number can be specified, and when 256 or more specifies the value (color number), the color of -1(transparent color)-32767 is displayed by the value of AND 255 in the PSET instruction etc. in BG0 and BG1 of SCREEN 1.

Note 3. BG2 of SCREEN 3 (Z axis rotation bit map) can be scrolled by the ROTCENTER instruction and the ROTPOS instruction. Moreover, (2) that makes outside display (0) or the area transparent repeating the image in the screen by the ROTOVER instruction can be selected. However, when the mode outside the screen is specified for one (It repeats and bury it by the character), operation similar to 0 is done.

---