Video DAC: Difference between revisions
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Only NTSC supports s-video. |
Only NTSC supports s-video. |
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The control deck can be modified to suport RGB as this was left unconnected in the retail. |
The control deck can be modified to suport RGB as this was left unconnected in the retail. |
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=== Pinout: === |
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<nowiki> ---------- -------- |
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| D0|--------| | composite video |
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| D1|--------| |---------------- |
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| D2|--------| | |
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| RCP D3|--------| DAC | luma (s-video) |
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| D4|--------| |---------------- |
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| D5|--------| | |
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| D6|--------| | chroma (s-video) |
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| !DSYNC|--------| |---------------- |
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| clock|---+----| | |
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| | | | | |
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---------- | -------- |
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OSC (~50Mhz) |
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</nowiki> |
Revision as of 20:45, 14 November 2021
The video DAC is connected to the RCP over a video bus. The Video Interface (VI) sends data to the video DAC from the framebuffer. The video bus is one (7-bit) byte wide and also has a !DSYNC signal. The !DSYNC signal is active on the first out of four bytes. The bus comes out of the RCP and is fed into the video DAC. A clock signal (about 50Mhz) is also connected to the DAC. Only NTSC supports s-video. The control deck can be modified to suport RGB as this was left unconnected in the retail.
Pinout:
---------- -------- | | | | | D0|--------| | composite video | D1|--------| |---------------- | D2|--------| | | RCP D3|--------| DAC | luma (s-video) | D4|--------| |---------------- | D5|--------| | | D6|--------| | chroma (s-video) | !DSYNC|--------| |---------------- | clock|---+----| | | | | | | ---------- | -------- | OSC (~50Mhz)