Sega Tera Drive

For more information, see this article's corresponding Wikipedia page: TeraDrive.

Sega Tera Drive

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

Capacitor Specifications and Footprint Information

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

Switches

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

Parts

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.

Related Links

• Tottori Sanyo SPS-356JU (Sega Tera Drive Power Supply)