Master System:Connector Pinouts

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AV Out

Note: Connector is the female end at the console. This connector is not present on the NTSC and PAL Master System II.

8pindin262.png
Pin # Description
1 Composite Video Out (SMS and Mark III) / Unused (French SMS and French SMS II)
2 Ground
3 Audio Out
4 Green
5 5V
6 Composite Sync
7 Red
8 Blue

Cartridge Port (Mark III and Japanese SMS (MK-2000)

Note: Pins A1 through A22 are towards the back and numbered from left to right. Pins B1 through B22 are towards the front and numbered the same way.

Controller Port

Note: Female is connector at the console. Male is connector at the controller. Diagram pictured is of the connector at the controller end. This pinout is mostly identical to the SG-1000.

DB9 Female.svg
Pin # Description
1 Up
2 Down
3 Left
4 Right
5 Unused
6 Button 1
7 TH/Light Phaser trigger (Master System) / Ground (Mark III, console side only)
8 Ground
9 Button 2

Mark III Expansion Port

This expansion port is only found on the Mark III and is mostly identical to the one in the SG-1000 and SG-1000 II.

Note: Pins are numbered from left to right with the edge of the connector facing forward.

Pin # Description
1 Ground
2 Ground
3 Ground
4 Ground
5 A2
6 Unused
7 IOREQ
8 CONT
9 Write
10 Read
11 KBSEL
12 D7
13 D6
14 D5
15 D4
16 D3
17 D2
18 D1
19 D0
20 A1
21 A0
22 KILLGA
23 5V
24 5V