av:dreamcastav
Differences
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av:dreamcastav [2009/04/19 00:45] – 82.16.34.173 | 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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===== Dreamcast AV Connector ===== | ===== Dreamcast AV Connector ===== | ||
- | The Dreamcast connector is a wild, multi-functioned beast. | + | The Dreamcast connector is a wild, multi-functioned beast. |
{{av: | {{av: | ||
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| 1 | Ground | | 1 | Ground | ||
| 2 | Right Audio | 10 |Composite Sync| | | 2 | Right Audio | 10 |Composite Sync| | ||
- | | 3 | Left Audio | 11 |S-video Chrominance (C)| | + | | 3 | Left Audio | 11 |S-Video Chrominance (C)| |
- | | 4 | +12v | 12 |S-video Luminance (Y)| | + | | 4 | +12v | 12 |S-Video Luminance (Y)| |
| 5 | +5v | 13 |Composite Video| | | 5 | +5v | 13 |Composite Video| | ||
| 6 | Mode Select 1 | 14 |Blue Out | | | 6 | Mode Select 1 | 14 |Blue Out | | ||
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==== Usage Notes ==== | ==== Usage Notes ==== | ||
- | The select pins are 6 and 7. Ground either one for two kinds of 15kHz RGB, ground both for VGA. **Note** that the Dreamcast outputs VGA, the box or cable does not ' | + | The mode select pins are 6 and 7. Ground either one for two kinds of 15kHz RGB (SCART), ground both for 31kHz RGB (VGA). **Note** that the Dreamcast outputs VGA, the box or cable does not ' |
- | You should use a 220uf capacitor on each of the RGB lines (+ towards console). | + | You should use a 220uF capacitor on each of the RGB lines (+ towards console). |
- | Note!! Please note that some of games will not run with a VGA box, or with the RGB/SCART mod. Most do, however. | + | <box round warning 40% |15kHz/ |
- | When the mode selection pins are used certain | + | If a certain |
- | **__MODE SELECTION ACTIVE SIGNALS CHART__** | + | ==== Mode Selection Signals Chart ==== |
+ | 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 |
| 1 | Ground | | 1 | 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:- 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 ==== | ==== Other ==== |
av/dreamcastav.txt · Last modified: 2019/08/27 20:45 by 127.0.0.1