SG-1000:Connector Pinouts

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Cartridge Port

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 later Sega Master System and Mark III.

DB9 Female.svg
Pin # Description
1 Up
2 Down
3 Left
4 Right
5 Unused
6 Button 1
7 Ground (console side only on SG-1000 and SG-1000 II) / Unused (SC-3000 only)
8 Ground
9 Button 2

Expansion Port

This expansion port is only found on 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 Unused
23 5V
24 5V