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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 SCART cables depending on the output connector used. The guides covers both a passive RGB mod which will take the video from the console's native RGB Encoder, or an active RGB bypass mod which will take the video from the console's native Video Display Processor and "bypass" the console's RGB Encoder.

Solder Map

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

Sega Master System 2 - IC BD M4 Jr.PAL 2M / 171-6395A

Schematics

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

The schematic for SMS2 - IC BD M4 Jr.PAL M2 / 171-6395A uses the same part designations.

Compare this to the schematic from a VA3 Master System model 1.

Sega Master System 1 - PAL VA3 171-5535-10

Missing Components

  • 10uf/16v electrolytic capacitor followed by a ferrite bead on the audio line out from the RGB Encoder.
  • 75ohm resistor followed by a 100uf/10v electrolytic capacitor followed by a ferrite bead on the composite video line.
  • The Red, Green & Blue video signals are direct to the AV connector from the RGB Encoder.
  • 8pin DIN

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 (171-5922A revision consoles)

  • 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

Fujitsu MB3514 RGB Encoder (171-6395A revision consoles)

  • 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.