Sega Master System 2 (SMS)
This section covers the pinout for the controller, RGB, composite and S-video modding of the board and tapping off the audio of the Sega Master System 2.
The SMS is a very good console system with some great games on it, and was the predecessor of the MegaDrive / Genesis console.
The SMS played US and UK games on the console without region modding required, although Japanese game carts are a different shape.
Note – don’t get the Model number 3006-05A made in Thailand as it doesn’t contain the Sony CTA chip you need to RGB mod the system – look for the Model number 3006-05 from China, that has the CTA chip. It looks like there were some revisions – the serial number of the Chinese one (you want) of mine was about 110 million, the Thailand one was around serial number 230 million.
The SMS2 says it needs 9v at 500mA, in reality, it will input 7.2v – 12v happily as the voltage feeds straight to a 7805 to feed 5v to the console. (not ideal to use 12v though as the surplus voltage is given off as heat so means more heat in console, so 7.2v – 9v input is more ideal).
Audio and video modding
The audio is tapped off the Sega 315-5246 chip, pin 15
And the video off the Sony CXA1145p chip
We don’t need to use a controller as each wire connection in the controller cable goes directly to the button on the controller itself.
Cart slot relocation
Here is a pic to show a cart slot relocated using 7.5″ wiring