av:dreamcastav
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av:dreamcastav [2009/11/01 15:54] – IiJhImnAwbBg 117.3.0.15 | av:dreamcastav [2019/07/27 21:41] – HSYNC and VSYNC come directly from the HOLLY GPU, so likely are active in all modes Link83 | ||
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- | WMF3y8 | + | ===== Dreamcast AV Connector ===== |
+ | The Dreamcast connector is a wild, multi-functioned beast. | ||
+ | |||
+ | {{av:dreamcast_av.jpg}} | ||
+ | |||
+ | ^Pin^Description^Pin^Description^ | ||
+ | | 1 | Ground | ||
+ | | 2 | Right Audio | 10 |Composite Sync| | ||
+ | | 3 | Left Audio | 11 |S-Video Chrominance (C)| | ||
+ | | 4 | +12v | 12 |S-Video Luminance (Y)| | ||
+ | | 5 | +5v | 13 |Composite Video| | ||
+ | | 6 | Mode Select 1 | 14 |Blue Out | | ||
+ | | 7 | Mode Select 2 | 15 |Green Out | | ||
+ | | 8 | Vertical Sync (for VGA) | 16 |Red Out | | ||
+ | |||
+ | ==== Usage Notes ==== | ||
+ | The mode select pins are 6 and 7. Ground either one for two kinds of 15kHz RGB (SCART), ground both for 31kHz RGB (VGA). | ||
+ | |||
+ | You should use a 220uF capacitor on each of the RGB lines (+ towards console). | ||
+ | |||
+ | <box round warning 40% |15kHz/31kHz RGB Note:> Most Dreamcast games are compatible with both 15kHz and 31kHz RGB modes (SCART and VGA) However a small percentage are not compatible and will show either a warning message on the Dreamcast' | ||
+ | |||
+ | If a certain game will not boot in either RGB mode it can sometimes be ' | ||
+ | |||
+ | ==== Mode Selection Signals Chart ==== | ||
+ | When the mode select pins are used certain signal outputs are enabled or disabled:- | ||
+ | |||
+ | ^Pin^Description^Standard ' | ||
+ | | 1 | Ground | ||
+ | | 2 | Right Audio | Right Audio | Right Audio | Right Audio | | ||
+ | | 3 | Left Audio | Left Audio | Left Audio | Left Audio | | ||
+ | | 4 | +12v | +12v | +12v | +12v | | ||
+ | | 5 | +5v | +5v | +5v | +5v | | ||
+ | | 6 | Mode Select 1 | Unused | Unused | Grounded | | ||
+ | | 7 | Mode Select 2 | Unused | Grounded | Grounded | | ||
+ | | 8 | Vertical Sync | VSYNC | VSYNC | VSYNC | | ||
+ | | 9 | Horizontal Sync | HSYNC | HSYNC | HSYNC | | ||
+ | | 10 | Composite Sync| ? | CSYNC | Disabled | | ||
+ | | 11 | S-Video Chroma (C)| S-Video Chroma | ? | Disabled | | ||
+ | | 12 | S-Video Luma (Y)| S-Video Luma | ? | Disabled | | ||
+ | | 13 | Composite Video| Composite Video | ? | Disabled | | ||
+ | | 14 | Blue | Disabled | Blue | Blue | | ||
+ | | 15 | Green | Disabled | Green | Green | | ||
+ | | 16 | Red | Disabled | Red | Red | | ||
+ | Note:- The HSYNC and VSYNC signals on the AV port come directly from the HOLLY GPU, so are likely active in all modes (Even 'TV mode' when no RGB signals are present) CSYNC is generated by the DAC, so is unfortunately only active in specific modes. | ||
+ | |||
+ | ==== Other ==== | ||
+ | [[dreamcastRGB|Ryu' | ||
+ | [[http://www.gamesx.com/grafx/dricas.gif|Dreamcast VGA Box Schematic]] | ||
+ | |||
+ | ---- | ||
+ | See here for the [[http://www.gamesx.com/avpinouts/ |
av/dreamcastav.txt · Last modified: 2019/08/27 20:45 by 127.0.0.1