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av:dreamcastav [2010/04/28 07:43] – old revision restored Lawrenceav:dreamcastav [2019/08/27 20:45] (current) – external edit 127.0.0.1
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 When the mode select pins are used certain signal outputs are enabled or disabled:- When the mode select pins are used certain signal outputs are enabled or disabled:-
  
-^Pin^Description^Standard Mode^15kHz RGB (SCART)^31kHz RGB (VGA)^+^Pin^Description^Standard 'TV' Mode^15kHz RGB (SCART)^31kHz RGB (VGA)^
 |  1  | Ground  | Ground | Ground | Ground | |  1  | Ground  | Ground | Ground | Ground |
 |  2  | Right Audio  | Right Audio  | Right Audio  | Right Audio  | |  2  | Right Audio  | Right Audio  | Right Audio  | Right Audio  |
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 |  6  | Mode Select 1  | Unused | Unused | Grounded | |  6  | Mode Select 1  | Unused | Unused | Grounded |
 |  7  | Mode Select 2  | Unused | Grounded | Grounded | |  7  | Mode Select 2  | Unused | Grounded | Grounded |
-|  8  | Vertical Sync  | ? | V-Sync +|  8  | Vertical Sync  | VSYNC? | VSYNC VSYNC 
-|  9  | Horizontal Sync  | ? | H-Sync +|  9  | Horizontal Sync  | HSYNC? | HSYNC HSYNC 
-| 10  | Composite Sync| ? | C-Sync |+| 10  | Composite Sync| ? | CSYNC Disabled |
 | 11  | S-Video Chroma (C)| S-Video Chroma | ? | Disabled | | 11  | S-Video Chroma (C)| S-Video Chroma | ? | Disabled |
 | 12  | S-Video Luma (Y)| S-Video Luma | ? | Disabled | | 12  | S-Video Luma (Y)| S-Video Luma | ? | Disabled |
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 | 15  | Green  | Disabled | Green | Green | | 15  | Green  | Disabled | Green | Green |
 | 16  | Red  | Disabled | Red | Red | | 16  | Red  | Disabled | Red | Red |
 +Note:- According to the [[schematics:console_related_schematics#dreamcast|schematics]] the HSYNC and VSYNC signals come directly from the 'HOLLY' GPU and are sent to both the DAC/Encoder and the AV port, which means they are likely active in all modes (Even standard 'TV' mode, when no RGB signals are present) However CSYNC is generated by the DAC/Encoder, so is unfortunately only active in specific modes.
  
 ==== Other ==== ==== Other ====
av/dreamcastav.1272404597.txt.gz · Last modified: 2019/08/27 20:44 (external edit)