Sega Model 2 Arcade Boards
Sega manufacturered several arcade boards based around a 32-bit architecture, using either Hitachi SH-2 or Intel i960 processors. These boards were the platform for some of their most famous and popular titles, including Virtua Fighter 2, Daytona USA, Sega Rally and Virtua Cop. While there are at least four variants of this hardware, for purposes of documenting connector pinouts these boards may all be collectively referred to as 'Sega Model 2' boards.
Several connectors are clearly (or unclearly) labelled at the edge of the Model 2 boards. The ones that concern us are connectors 3, 7, 10, 12, and 13.
| Model 2 Connector 7 | ||||
|---|---|---|---|---|
| Pin | Function | |||
| 1 | ↔ | Video, Red | ||
| 2 | ↔ | Video, Green | ||
| 3 | ↔ | Video, Blue | ||
| 4 | ↔ | Video, Synch | ||
| 5 | ↔ | Video, Ground | ||
NOTE: Many Sega Model 2 games (including Virtua Fighter 2) require a monitor capable of a 24 kHz synch signal. Yes, this is weird.
| Model 2 Connector 10 | ||||
|---|---|---|---|---|
| Pin | Function | |||
| 1 | ↔ | Player One, Coin | ||
| 2 | ↔ | Player Two, Coin | ||
| 3 | ↔ | Test Switch | ||
| 4 | ↔ | Service Switch | ||
| 5 | ↔ | Player One, Expansion Switch 4 | ||
| 6 | ↔ | Player One, Expansion Switch 5 | ||
| 7 | ↔ | Player One, Start | ||
| 8 | ↔ | Player Two, Start | ||
| 9 | ↔ | Player One, Button 1 | ||
| 10 | ↔ | Player One, Button 2 | ||
| 11 | ↔ | Player One, Button 3 | ||
| 12 | ↔ | Unspecified Expansion | ||
| 13 | ↔ | Player One, Down | ||
| 14 | ↔ | Player One, Up | ||
| 15 | ↔ | Player One, Right | ||
| 16 | ↔ | Player One, Left | ||
| 17 | ↔ | Player Two, Button 1 | ||
| 18 | ↔ | Player Two, Button 2 | ||
| 19 | ↔ | Player Two, Button 3 | ||
| 20 | ↔ | Player Two, Expansion Switch 4 | ||
| 21 | ↔ | Player Two, Expansion Switch 5 | ||
| 22 | ↔ | Player Two, Down | ||
| 23 | ↔ | Player Two, Up | ||
| 24 | ↔ | Player Two, Right | ||
| 25 | ↔ | Player Two, Left | ||
| Model 2 Connector 13 | ||||
|---|---|---|---|---|
| Pin | Function | |||
| 1 | ↔ | Audio, Channel 1 | ||
| 2 | ↔ | Audio, Channel 1 | ||
| 3 | ↔ | Audio, Channel 2 | ||
| 4 | ↔ | Audio, Channel 2 | ||
NOTE: Some Model 2 boards drive more than one pair of speakers, and so may not have redundant audio signals as shown above. Most Sega games found in upright cabinets will have that pinout for audio signals.
| Model 2 Connectors 3 and 12 | ||||
|---|---|---|---|---|
| Pin | Function | |||
| 1 | ↔ | +5V | ||
| 2 | ↔ | +5V | ||
| 3 | ↔ | +5V | ||
| 4 | ↔ | +5V | ||
| 5 | ↔ | +5V | ||
| 6 | ↔ | Ground | ||
| 7 | ↔ | Ground | ||
| 8 | ↔ | Ground | ||
| 9 | ↔ | Ground | ||
| 10 | ↔ | Ground | ||
NOTE: In most cases, connectors 3 and 12 are not redundant and in fact power distinct portions of the board. If in doubt, apply the appropriate power signal to every pin on both connectors.
The bulk of this information was sourced from data found at http://www.arcadebase.de/ and believe it or not, most of the page is in English.
Coming soon: A pretty picture and a diagram of where in the heck these connectors actually are in relation to each other on the board.