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void
Scroll function

slColRateBACK

Back screen color calculation ratio set

Format

void slColRateBACK(rate)
Uint16 rate ;

Parameter

rate Color calculation ratio (0x00 to 0x1f)

Function

Set the color calculation ratio to be used for color calculation on the back screen.

Return value

None

Remarks

The calculation ratio value specified for the parameter is 0x00 to 0x1f.
Each of these values ​​represents the calculation ratio. For example, if “rate = 0x0f” is assigned, the calculation ratio of TOP image and 2ND image is 16:16.
Refer to the table of “HARDWARE MANUAL vol.2” (VDP2 User's Manual P244) for the relationship between the substitution value and the calculation ratio.

Reference: Chapter 8 Scroll

slColRateBACK

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