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Limit scrolling by the number of character colors

Depending on the number of color settings of the normal scroll screen NBG0, NBG1, there may be restrictions on the number of scroll surfaces that can be output.
The following table summarizes this.

Table 8-9 Scroll surface limit by number of character colors

Note) * indicates selection of 256 colors or less.

• If NBG0 is set to 16.77 million colors, NBG1 to NBG3 cannot be displayed.
• If NBG0 is set to 2048 or 32768, NBG2 cannot be displayed.
• If NBG1 is set to 2048 or 32768 colors, NBG3 cannot be displayed.

About scroll limitation by VRAM access

Sega Saturn also has scroll restrictions due to VRAM access due to hardware performance.
This applies with a limit on the number of character colors on the normal scroll screen.
In particular, if you set the normal scroll surface to a reduced size or use a rotating scroll surface, you must be careful because the scroll surface that can be drawn is significantly restricted along with the number of character colors.
For details on access restrictions, refer to “HARDWARE MANUAL vol.2: VDP2 User's Manual”.

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