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■ 4.9 Bitmap

When displaying in bitmap format, the size can be selected from four sizes: 512 (horizontal) x 256 (vertical) dots, 512 (horizontal) x 512 (vertical) dots, 1024 (vertical) x 256 (vertical) dots, or 1024 (vertical) x 512 (vertical) dots. Select to store the bitmap pattern data of each dot composing the bitmap in VRAM.

■ Bitmap size

The types of bitmap size that can be selected on the normal scroll screen and rotary scroll screen are different.
∙ In the normal scroll screen, when the high resolution graphic mode with a horizontal resolution of more than 512 pixels is specified, the same picture is repeated in the horizontal direction when a bitmap size with a horizontal width of 512 dots is selected. In addition, when the dedicated monitor mode or double-dense interlace mode with a vertical resolution of more than 256 pixels is specified, the same picture is repeated in the vertical direction when a bitmap size with a vertical length of 256 dots is selected.
The bitmap size is shown in Table 4.9.

Table 4.9 Bitmap size
Screen Selectable bitmap size
Normal scroll screen 512 dots wide x 256 dots tall
512 horizontal dots × 512 vertical dots
Width 1024 dots x Height 256 dots
Width 1024 dots x Height 512 dots
Rotary scroll screen 512 dots wide x 256 dots tall
512 horizontal dots × 512 vertical dots

■ Bitmap color depth

The color format for displaying the bitmap format screen includes the palette format that specifies the color RAM address by combining the bitmap palette number and the dot color code in the bitmap pattern data, and the RGB data to be displayed. There is an RGB format that can be specified directly. Table 4.10 shows the number of colors per bitmap and the number of bits per dot in bitmap pattern data for each color format. Also, the number of bitmap colors is set to the number of character colors in the character control register.

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