Sega Master System

  1. Power Connector
  2. Output Audio/Video Connector
  3. RGB Encoder
  4. Video Display Processor
  5. Gate Array / IO Controller
  6. Controller Port Pinout
  7. Audio Video Schematics
  8. Capacitor Lists

Power Connector

Plug Type Coaxial / Barrel Connector
Size 5.5mm Outer Diameter / 2.1mm Inner Diameter
Voltage 9V DC
Amperage 850mA
Polarity Center Negative

Audio/Video Output Connector

262 Degrees “U-Shape” 8-Pin DIN

Pin Signal
1 Mono Audio
2 Ground
3 Composite Video (CVBS)
4 +5V
5 Green Video
6 Red Video
7 Composite Sync
8 Blue Video

RGB Encoder

Sony V7040 Pinout (Early Console)

Sony CXA1145P Pinout (VA3 Console)

Video Display Processor

SEGA 315-5124 Pinout

SEGA 315-5246 Pinout

Gate Array / IO Controller

SEGA 315-5216 Pinout

  • NTSC-U / 837-6067 / 171-5379
  • PAL / 837-6097 / 171-5385
  • NTSC-U / 837-6629 / 171-5533-01A
  • PAL / VA2 / 171-5672

SEGA 315-5237 Pinout

  • PAL / VA3 / 171-5535-10

Controller Port Pinout

Pin Function
1 Up
2 Down
3 Left
4 Right
5 No Connection
6 Button 1
7 Light Sensor
8 Ground
9 Button 2

Audio Video Schematics

PAL VA3 171-5535-10

Capacitor Lists

Sega Master System – NTSC-U / 1986 / 837-6067 / 171-5379

Location Capacitance Voltage
C4 100 10
C1 10 25
C120 10 25
C121 10 25
C49 10 25
C20 100 10
C22 100 10
C28 100 10
CA20 100 10
C25 100 10
C131 10 25
C119 10 25
C1 10 25
C123 47 10
C124 47 10
C122 47 10

Sega Master System – PAL / VA2 / 1988 / 171-5672

Location Capacitance Voltage
C4 100 10
C25 100 10
C28 100 10
C1 100 16
C120 10 16
C121 10 16
C48 10 16
C6 4.7 16
C51 1 50
C30 100 10
C131 10 16
C119 10 16
C137 10 16
CA1 10 16
C123 47 10
C124 47 10
C122 47 10

Sega Master System – PAL / VA3 / 1989 / 171-5535-10

Location Capacitance Voltage
CE 10 16
C53 100 10
C50 100 16
C72 100 10
C63 100 10
C62 1 50
C54 100 10
CE 10 16
C70 10 16
C71 10 16
CE 10 16
CE 10 16
CE 10 16
CE 10 16
C1 10 16
C9 47 10
C10 47 10
C11 47 10