/vr/ - Retro Games

>>1978376
Here you go anon.

>>1978739
You could use XOR gates (74HC86), 2 to be able to switch the polarity Hsync and Vsync and 1 or 2 to mix it to Csync. And use a 470-1000 ohm resistor to drop the voltage down to 348-688mVpp and could put a 220µF capacitor in series to remove the DC offset (optional, composite should be AC coupled).
This is what i did, plus 2 NE555 based overfrequency protection circuits which blocks Csync if H>17khz and V>63hz (sufficient to block standard PC resolutions).
But you need a graphics card able to do 15khz horizontal, my experience with Nvidia is terrible (GTX460SE crashed and 9600GT denied interlaced) but ATI(/AMD) is better.

>>1978830
>hsync and vsynce summed with 1Kohm
You don't know what you're doing.