TeraDrive

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TeraDrive
Mega Drive
SuccessorAmstrad Mega PC (3rd party product developed on licence by Amstrad)

The TeraDrive (テラドライブ, TeraDoraibu) is an

Mega Drive, developed by Sega and manufactured by IBM
in 1991. The TeraDrive allowed for Mega Drive games to be played the same time as the PC section is being used, as it is possible for the Mega Drive and PC hardware to interact with each other.

The system was only released in Japan. Sega hoped that integrating the then popular Mega Drive console into an IBM PC would attract potential customers wishing to purchase a PC, but the system proved unpopular and was a commercial failure.

Design

Main article:
Sega Mega Drive § CPU

One of the main processors used for the system is the

Intel 80486 had been released in 1989, making the TeraDrive's central processor 2 generations behind its time. The system also contains a Motorola 68000 and a Zilog Z80, the same processors which were used in the Mega Drive, that ran at 7.67 MHz and 3.58 MHz respectively.[3]

The machine's front panel ports included two Mega Drive pad ports which were similar in design to 9-pin male

RGB
for monitor connection, and a 2nd 9-pin male serial connector labelled "EXT", similar to that found on the rear of an original Mega Drive base unit.

The motherboard also had a spare ISA slot available for expansion, with a hole at the rear of the unit to accommodate this.

Interface

Its

interface consisted of a start-up menu with several options, including a file manager, DOS, a clock and Mega Drive mode.[4]

The machine included IBM drivers bundled on a

PC DOS.[3]

There was often speculation that the TeraDrive was specifically designed as a purpose-made

development kit, to allow software makers to develop their software titles for the Mega Drive. However, given the release date of the TeraDrive (some years after the initial Mega Drive release), as well as the availability of Sega's own game development hardware, it is unlikely the TeraDrive was designed for this purpose.[3]

Peripherals

The system's peripherals which were included or available separately, included 2 × Mega Drive pads, 1 ×

PS/2
Mouse, 1 × Sega branded PS/2 IBM keyboard and 1 × 3-button joystick. The Mouse and Mega Drive pads were practically identical to those found on the Mega Drive console version.

A monitor which was manufactured by a 3rd party company but with Sega branding, was available separately at a price of ¥79,800 (estimated US$600/GBP £300 at the time), which was capable of displaying 15 kHz

VGA output from the PC hardware, both from the VGA connector.[3]

Models

Three models were available, ranging from ¥148,000 (US$1100/GBP £580) to ¥248,000 (US$1840/GBP £950).

Technical specifications[3][5]
Model Model 1 Model 2 Model 3
Price (at launch) ¥148,000 ¥188,000 ¥248,000
Processor Intel 80286 (10 MHz), Motorola 68000, Zilog Z80
RAM
(available / maximum) 		640 KB/2.5 MB 1 MB/2.5 MB 2.5 MB/2.5 MB
Storage
 1 FDD 2 FDDs 1 FDD, 1 30MB
HDD
Graphics modes
  • PC Mode
    • 640×480 pixels (262144 colors / 16 onscreen)
    • 320×200 pixels (262144 / 256; Mode 13h)
  • Mega Drive Mode
    • 320×224 pixels (512 / 64)
    • 256×224 pixels (512 / 64)
I/O ports
  • PC
  • Mega Drive
    • 2 ×
      D-connectors
      )
    • 1 × Expansion
Operating system
IBM DOS
J4.0/V

Sales

The system proved unpopular with the Japanese market and ultimately failed. Production numbers are unknown.

The system is moderately rare in Japan, although prices are rising rapidly due to collector demand. The price to buy a TeraDrive in June 2003 was triple the price it was 2 years prior.[3]

A new PC was also in the discussion stages to be developed by Sega under the leadership of ex-IBM executive Narutomi.[6] but this likely never got past the discussion stages due to the failure of the TeraDrive.

Similar products

Main article: Amstrad Mega PC

A similar, but unrelated system was manufactured by

Software Development Kit
due to the inability to interact both the PC and the Mega Drive together, as it was essentially just a PC with a Mega Drive bundled inside.

See also

  • Variations of the Sega Mega Drive

References

  1. ^ "OLD-COMPUTERS.COM Museum ~ Sega Teradrive". Archived from the original on 2019-09-11. Retrieved 2006-11-22.
  2. ^ "Original page". Archived from the original on June 17, 2006. Retrieved 2007-07-22.{{cite web}}: CS1 maint: bot: original URL status unknown (link)
  3. ^ a b c d e f "Sega / IBM TeraDrive". Retrieved 2006-11-22.
  4. ^ "Old-Computers.com". Archived from the original on 2017-09-14. Retrieved 2007-07-24.
  5. ^ "Official specifications on Sega website". 関連・周辺機器 | メガドライブ | セガハード大百科 | セガ (in Japanese). Retrieved 2021-06-21.
  6. ^ Ex-IBM man joins Sega to push game machines FindArticles.com, 19 August 1991

External links

Wikimedia Commons has media related to Sega TeraDrive.
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