Video DAC
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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)