natshaw wrote:Yes, my current (not yet 100% proven) theory would be:
• unplug connector from existing daughterboard
• connect new cable/circuit to that connector
That connector has luminance, Pb, and Pr from the motherboard.
natshaw wrote:How cable would reach outside the SC-3000 is up for debate. Personally, I'd go for replacing the 5-pin video DIN with an 8-pin, a-la the Yeno model, as the motherboard already has the holes for it, but you could call that a hack too! Or, you could run cable out of a gap somewhere.
PAL (4095) Function Dir Test Motherboard (4094) YENO (4099)
1 Grey Pr In 555 ohms to GND P1, 9929 pin 38 2 Red
2 Purple Pb In 557 ohms to GND P2, 9929 pin 35 1 Brown
3 Blue Y In 540 ohms to GND P3, 9929 pin 36 3 Orange
4 Green GND - P4 4 Yellow
5 Black GND - P5, GND 8 Grey
6 Orange Comp Out P6, to base of TR1 n/c
7 Brown RF Out P7, to RFM-1 n/c
8 Red +9V In P8, direct feed from fuse 11 Brown
n/c SCART P17, near CN1 5 Green
n/c SCART P14, near CN1 6 Blue
n/c SCART P16, near CN1 7 Purple
n/c SCART P13, near CN1 10 Black
n/c SCART P18, near CN5, to CN1 12 Red
n/c SCART P15, near CN1 9 White
natshaw wrote:1. How to remove it? If I just use an inline cap, how do I determine which original voltage level will become the output's 0V?
natshaw wrote:2. How to add a - or + DC offset if I need one?
- Remove DC bias
- Amplify (or attenuate) signal to 1Vpp
- Add DC bias
natshaw wrote:I know some TVs will have AC coupling caps on their inputs (mine seems to), but I do want to make this work to the standard, as opposed to just on my TV
I only have NTSC consoles. I'm running directly off of the TMS9928A's pins 35, 36, and 38. I'm guessing this would work just as well from a TMS9929A.
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