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Sega Master System Model 2 RGB Video Mod Install Guide

This guide will show you how to get RGB video out of the Sega Master System model 2. It will be compatible with all stock Master System or Mega Drive 2 cables depending on the output connector used.

Solder Map

Sega Master System 2 - IC BD M4 Jr / 171-5922A

Schematics

Sega Master System 2 - IC BD M4 Jr / 171-5922A

Mod Pinouts

The mod is concerned with two ICs inside the Master System. The Video Display Processor and the RGB Encoder.

For a passive RGB mod, take the RGB signals from the RGB Encoder.

For an active RGB mod, take the RGB signals from the Video Display Processor.

Sony CXA1145P RGB Encoder

  • Pin 23 for Red Video (Passive Mods)
  • Pin 22 for Green Video (Passive Mods)
  • Pin 21 for Blue Video (Passive Mods)
  • Pin 20 for Composite Video
  • Pin 10 for Composite Sync (Yes, from the C-SYNC IN pin)
  • Pin 9 for Mono Audio

SEGA 315-5246 Video Display Processor

  • Pin 27 for Red Video (Active Mods)
  • Pin 28 for Green Video (Active Mods)
  • Pin 29 for Blue Video (Active Mods)
  • Pin 30 for Composite Sync

Output Audio/Video Connector

There is a choice of two connectors to make it backwards compatible with Master System of Mega Drive 2 cables.

9-Pin Mini DIN (Through hole/Surface mount)

The use of this connector will require the removal of the RF box.

262 Degree "U-shape" 8-Pin DIN (Panel Mount version)

The use of this connector will require a hole cutting in the Master System case. Alternatively the RF box can be removed and the hole made larger.