SG-1000:Connector Pinouts

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Cartridge Port

Note: Pins A1 through A22 are towards the back and numbered from left to right, B1 through B22 are towards the front and also numbered from left to right. On the SC-3000, A1 through A22 are towards the bottom and B1 through B22 are towards the top.

Pin # Description Pin # SG-1000 SG-1000 II SC-3000
A1 A0 B1 5V
A2 A1 B2 5V
A3 A2 B3 OSRAM CSRAM OSRAM
A4 A3 B4 EXM1 CEROM
A5 A4 B5 RD MEMR
A6 A5 B6 WR MEMW
A7 A6 B7 Unused I/O R
A8 A7 B8 Unused I/O W
A9 A8 B9 RFSH colspan=2| Unused
A10 A9 B10 MREQ
A11 A10 B11 CONT
A12 A11 B12 Unused RAS1
A13 A12 B13 Unused CAS1
A14 A13 B14 Unused RAM A7
A15 D0 B15 Unused RAS2
A16 D1 B16 Unused CAS2
A17 D2 B17 Unused MUX
A18 D3 B18 A14
A19 D4 B19 EXM2 A15
A20 D5 B20 M1 colspan=2| Unused
A21 D6 B21 Ground
A22 D7 B22 Ground

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, SG-1000 II and Othello Multivision consoles.

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

SC-3000 Monitor Out

Note: Female connector is pictured. The same pinout is also used on the Master System and Genesis/Mega Drive.

5pindinnumbered.png
Pin # Description
1 Composite Video Out
2 Ground
3 Audio Out
4 Unused
5 Unused


Yeno SC-3000 Monitor Out

Note: Female connector is pictured.

8pindin270.png
Pin # Description
1 Composite Sync
2 Ground
3 Audio Out
4 Vertical Sync
5 Horizontal Sync
6 Green
7 Blue
8 Red