How to mod SG-1000 Mk1 and Mk2 for Composite Video + SG-1000 MK2 RGB

So thanks to some people at SMSPower and AtariAge I was able to obtain SG-1000 Composite Mod Instructions.

You'll need:
1 - 470 ohm pulldown resistor
1 - .001uF Ceramic Disc Capacitor
2 - RCA Phono Chassis Panel Mount Female Socket (Audio/Video Jacks)
Wire and Solder of course!

1. For video all you need to do is wire up a 470 ohm pulldown resistor to pin 36 of the chip labeled TMS9918 (meaning you wire the resistor from pin 36 to ground) and then wire your video jack to pin 36. Polarity of the ohm resistor doesn't matter.

2. For audio With Pin 9 of the chip labeled SN76489 just solder one leg of the capacitor to pin 9 and the other leg to ground. Solder your center wire of the audio to Pin 9 as well (or the leg of the capacitor running to pin 9).

I grounded using the RF Modulator, however there could be other spots to ground. Please share if you know of a better spot

Special Thanks to Phoenixdownita of AtariAge, and ApolloBoy, Maraakate of SMSPower for the help!

For those of you looking for a RGB mod. Only certain model of Sega SG-1000 MK2 can be modded for RGB. I believe the key is looking for a model with 5 rubber feet on the bottom instead of 4.

Here's a guide for that

http://www.nightfallcrew.com/02/09/2012/rgb-synch-amplifier-circuit-for-sega-sg-1000-ii-mark-2/

Enjoy!