Differences

This shows you the differences between two versions of the page.

--- av:dreamcastav [2013/01/21 02:29] – [Mode Selection Signals Chart] RGB32E
+++ av:dreamcastav [2019/07/27 22:29] – [Mode Selection Signals Chart] Link83
@@ Line 26: / Line 26: @@
 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 |
 |  2  | Right Audio  | Right Audio  | Right Audio  | Right Audio  |
@@ Line 34: / Line 34: @@
 |  6  | Mode Select 1  | Unused | Unused | 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 | Disabled |
+| 10  | Composite Sync| ? | CSYNC | Disabled |
 | 11  | S-Video Chroma (C)| S-Video Chroma | ? | Disabled |
 | 12  | S-Video Luma (Y)| S-Video Luma | ? | Disabled |
@@ Line 43: / Line 43: @@
 | 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 standard 'TV' mode, when no RGB signals are present) CSYNC is generated by the DAC, so is unfortunately only active in specific modes.
 ==== Other ====