SAGA_VIDEO_VSSTOP register
Overview
Change the current SAGA Video ModeLine VSSTOP attribute.
Name
SAGA_VIDEO_VSSTOP
Address
0xDFF30C
Access
Write-Only
Size
16-bits
Description
See ModeLine for more information.
| Property | Short | Description |
|---|---|---|
VPIXEL | Height | Number of vertical pixels drawn to the visible part of the screen. |
VSSTRT-VPIXEL | Front Porch | Amount of black pixels drawn on the bottom of the screen. |
VSSTOP-VSSTRT | Vertical Sync | Amount of time it takes to move back up to the first line of the screen. |
VTOTAL-VSSTOP | Back Porch | Amount of black pixels drawn to the top of the screen. |
Example
The following ASM snippet shows how to fully set a valid ModeLine.
MAIN: lea MyModeLine,a0 ; Load MyModeLine in A0 move.w (a0)+,$dff300 ; SAGA_VIDEO_HPIXEL move.w (a0)+,$dff302 ; SAGA_VIDEO_HSSTRT move.w (a0)+,$dff304 ; SAGA_VIDEO_HSSTOP move.w (a0)+,$dff306 ; SAGA_VIDEO_HTOTAL move.w (a0)+,$dff308 ; SAGA_VIDEO_VPIXEL move.w (a0)+,$dff30A ; SAGA_VIDEO_VSSTRT move.w (a0)+,$dff30C ; SAGA_VIDEO_VSSTOP move.w (a0)+,$dff30E ; SAGA_VIDEO_VTOTAL move.w (a0)+,$dff310 ; SAGA_VIDEO_HVSYNC rts MyModeLine: dc.w 800,832,912,1024,600,604,608,625,1 ; "800x600@60" 38.400000
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Last modified: le 2020/08/02 12:37
