Master System II (CXA1145)
The Sony CXA 1145 video chip has RGB, S-video and composite outputs. You can connect any or all of these in your mod. For RGB, you will need the composite connection to be present for sync.
Use normal electrolytic capacitors.
As shown on the schematic, the video connections are obtained from various pins on the Master System's CXA 1145 encoder chip. You can solder wires directly to the legs of the chip - the pin numbers are printed on the Master System's motherboard, in case you're unsure.
Audio is obtained from pin 15 of the SMS's custom chip marked 315-5246, which has 64 pins close together in a zig-zag formation. (Rather than solder directly to the chip, you can instead solder to the negative leg of capacitor C31, an electrolytic capacitor just in front of the CXA 1145.)
Finally the GND and switching voltage connections can be obtained from any ground and +5v points on the board, respectively. Pins 24 and 12 respectively of the CXA 1145 are suitable.
If you're using a SCART connection, here are the appropriate pins of the plug :
| Connection | SCART pin |
|---|
| Red | 15 |
| Green | 11 |
| Blue | 7 |
| Composite/Sync In | 20 |
| RGB switching | 16 |
| Ground | 4, 17, 21 |
| Audio In | 2, 6 |
