Sega Tera Drive
- For more information, see this article's corresponding Wikipedia page: TeraDrive.
| Preliminary Information | |
|---|---|
| Release Year | 1991 |
| Leak Risk | Medium |
| Batteries | None |
| Capacitor Types | Through Hole |
| Destructive Entry | No |
The Sega Tera Drive is an early Japanese DOS/V computer which consists of an IBM PS/55 (the Japanese variant of the IBM PS/2) and a Sega Mega Drive on the same motherboard. The two systems can communicate with one another, in contrast to the Amstrad Mega PC. At this time, only two commercial titles are known to use this capability: Puzzle Construction and The Manhole. Puzzle Construction has a game editor on the PC side, which runs games on the Mega Drive side. The Manhole is a PC game which uses the Mega Drive's Yamaha OPN2 for FM synthesis.
The power supply commonly fails, and its capacitors are listed on the linked wiki page.
Known Issues
MD/PC or Video Mode Switches Are Glitchy / System Randomly Resets
Causes
- The switches have failed
- The switches have cracked solder joints
Solutions
- Replace switches with new ones
- Resolder switch pins
Video Glitching / Unable To Maintain Horizontal Refresh
Causes
- Out-of-spec capacitors
Solutions
- Replace capacitors
Noisy Mega Drive Graphics
Causes
- Bad PCB Design
- Low quality custom chips
Solutions
- None yet. The Mega Drive Triple Bypass needs to be adapted for this system.
Disassembly Notes
The board is somewhat tricky to get out the first time you try. Also, the front face plate requires an unreasonable amount of force to remove, and must be done carefully to avoid breaking the tabs.
Original Parts
Motherboard
| RefDes | Qty | Capacitance | Voltage | Mount | Diameter/Size | Height | Lead Spacing | Temp | Type | Brand | Series |
|---|---|---|---|---|---|---|---|---|---|---|---|
| C1, C2, C3, C5, C8, C10, C12, C13, C14, C15, C17, C19, C24, C26, C30, C31, C32, C33, C36, C37, C38, C40, C41, C43, C45, C48, C49, C54, C57 | 29 | 33 µF | 16 V | Through Hole | 5 mm | 8 mm | 5 mm | 85 °C | Aluminum Electrolytic | Panasonic/Matsushita | KA |
| C6, C9, C16, C23 | 4 | 470 µF | 16 V | Through Hole | 10 mm | 10 mm | 5 mm | 85 °C | Aluminum Electrolytic | Nichicon | RS(M) |
| C7, C21, C51, C52, C58 | 5 | 100 µF | 16 V | Through Hole | 8 mm | 7 mm | 5 mm | 85 °C | Aluminum Electrolytic | Nichicon | "H049" code |
| C46, C47, C55, C56 | 4 | 47 µF | 16 V | Through Hole | 6 mm | 7 mm | 5 mm | 85 °C | Aluminum Electrolytic | Nichicon | "A107" code |
| C53, C60 | 2 | 220 µF | 16 V | Through Hole | 8 mm | 10 mm | 5 mm | 85 °C | Aluminum Electrolytic | Nichicon | RS(M) |
| C4, C18, C22, C28, C29, C34, C35, C42, C50, C59 | 10 | 10 µF | 16 V | Through Hole | 5 mm | 7 mm | 5 mm | 85 °C | Aluminum Electrolytic | Nichicon | "A113" code |
| C27, C44 | 2 | 22 µF | 16 V | Through Hole | 5 mm | 7 mm | 5 mm | 85 °C | Aluminum Electrolytic | Nichicon | "A104" code |
| C20, C23 | 2 | 2.2 µF | 50 V | Through Hole | 4 mm | 8 mm | 5 mm | 85 °C | Aluminum Electrolytic | Panasonic/Matsushita | KA |
| C39 | 1 | 3.3 µF | 50 V | Through Hole | 4 mm | 8 mm | 5 mm | 85 °C | Aluminum Electrolytic | Panasonic/Matsushita | KA |
| RefDes | Qty | Mount | Poles | Positions | Actuator Direction | Actuator Length | Actuator Travel | Actuator Size | Pin Spacing | Width | Height | Depth | Brand | Series |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| S1, S3 | 2 | Through Hole | 1 | 2 | Horizontal | 9 mm | 2 mm | 2 mm x 2 mm | 2 mm | 14.5 mm body, 15.3 mm mounting holes | 8.5 mm | 7 mm | Alps | SSSF112500 |
Replacement Parts
Motherboard
| RefDes | Qty | Compatible Part Number | Order Links |
|---|---|---|---|
| C1, C2, C3, C5, C8, C10, C12, C13, C14, C15, C17, C19, C24, C26, C30, C31, C32, C33, C36, C37, C38, C40, C41, C43, C45, C48, C49, C54, C57 | 29 | Wurth Elektronik 860020372003 | Mouser |
| C6, C9, C16, C23 | 4 | Wurth Elektronik 860020374012 | Mouser |
| C7, C21, C51, C52, C58 | 5 | Wurth Elektronik 860020372006 | Mouser |
| C46, C47, C55, C56 | 4 | Wurth Elektronik 860020372004 | Mouser |
| C53, C60 | 2 | Wurth Elektronik 860020373010 | Mouser |
| C4, C18, C22, C28, C29, C34, C35, C42, C50, C59 | 10 | Wurth Elektronik 860020372001 | Mouser |
| C27, C44 | 2 | Wurth Elektronik 860020372002 | Mouser |
| C20, C23 | 2 | Wurth Elektronik 860020672006 | Mouser |
| C39 | 1 | Wurth Elektronik 860020672007 | Mouser |
| S1, S3 | 2 | Alps SSSF112500 | Mouser |
| Full BOM | Mouser | ||
If parts are not available or different selection is preferred, you can use the values in the Original Parts section to perform a parametric search.