SDI: Strategic Defense Initiative

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SDI: Strategic Defense Initiative
SDI: Strategic Defense Initiative
Publisher: Sega Commodore Amiga Amstrad CPC Atari ST Commodore 64 ZX Spectrum Activision

Developer: Sega Amstrad CPC Pixies Commodore 64 Source

System(s): Sega System 16, Sega Master System, Amiga, Amstrad CPC, Atari ST, Commodore 64, ZX Spectrum

ROM Size: Sega Master System 128kB

Genre: Shoot-'em-Up














Number of Players: 2

Release Date RRP Code
Arcade World 1987  ?
Sega Master System JP 1987-10-24 ¥5,000 G-1338
Sega Master System US 1988 $40.00  ?
Sega Master System EU 1988-03 £19.95 MK-5102-50
Sega Master System KR 19xx ₩? GB-1338
Commodore Amiga UK 1988 £24.99  ?
Atari ST UK 1988 £19.99  ?
Amstrad CPC UK (cassette) 1988 £9.99  ?
Amstrad CPC UK (disk) 1988 £14.99  ?
Amstrad CPC UK (The Hit Squad) 19xx £2.99  ?
Amstrad CPC ES (cassette) 19xx  ?Ptas  ?
Commodore 64 US (cartridge) 1988 $?  ?
Commodore 64 UK (cassette) 1988 £14.99  ?
Commodore 64 UK (disk) 1988 £14.99  ?
Commodore 64 UK (The Hit Squad) 19xx £2.99  ?
ZX Spectrum UK (cassette) 1988 £9.99 URK 301
ZX Spectrum UK (The Hit Squad) 19xx £2.99  ?
ZX Spectrum ES (cassette) 19xx  ?Ptas SEC 576


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SDI: Strategic Defense Initiative is a 1987 shoot-'em-up arcade game developed by Sega for the Sega System 16 arcade platform.

Gameplay

Unusual for its time, SDI has the player assume the role of a satellite, tasked with destroying enemy satellites and missiles. Each level is divided into two "modes" - "offensive" mode, which takes the form of a sidescrolling shoot-'em-up, and "defensive" mode which is built more similarly to Atari's Missile Command. Beating both modes allows the player to progress, however, if the player can destroy all the enemies in offensive mode, defensive mode does not take place.

SDI not only gives the player control over the movement of the satellite, but also its aim. This mechanic was implemented in the original arcade cabinet through the form of a joystick and trackball - the joystick moving the player, the trackball moving the crosshair. On the top of the joystick is a button for firing.

A perfect game of SDI will result in the satellite being replaced with Flicky.

Ports

SDI was ported to the Sega Master System in 1987/1988, where western versions were renamed Global Defense. The Master System version, as well as cutting back on the graphical and audio quality, has to vastly reduce the difficulty of the game to match up with a new control scheme - as the console lacks a trackball, the player needs to switch between moving and aiming during play (holding 1 while moving the D-Pad allows the satellite to move, otherwise the D-Pad only controls the crosshair). This makes moving and aiming at the same time impossible. However, the U.S. manual lists an alternate two-controller configuration in which the first controller aims and the second controller moves the satellite. When the game is started in this configuration, the satellite fires automatically. To start the game with two controllers, on the second controller either press Left and 1 or Right and 2.

Activision brought the game to home computers in Europe - the Amiga, Amstrad CPC, Atari ST, Commodore 64 and ZX Spectrum (not to be confused with S.D.I., an unrelated game also released for the Amiga and Atari ST).

These days, SDI is often grouped with another arcade game from the era, Quartet. Both were released as part of Volume 21 of the Sega Ages 2500 series, Sega Ages 2500 Series Vol. 21: SDI & Quartet: Sega System 16 Collection for the PlayStation 2. SDI & Quartet: Original Soundtrack contains the official soundtrack of both games.

Production Credits

Arcade Version

Planed by: Black Holl Tomo
Project Leader: Joe Kacchan
Programer: Sweet Tohchan, Anatano Pideshi, Ippo Ogapi
Character Design: Saitama Kenji, 8940 Kon
Scene Design: Henchan
Music by: Funky Gerogero
Sound Effects: Nao Chan
Mechanical Engineer: MI.U.I.Hachi
Enemy Creation: Demon Taka
Data Adjust: Nanno Icchan
Special Thanks: Mina Inochi, Hakusyon Daimaohe, Mamiko Chan, Uso Happyaku
Special No Thanks: Ashidematoi People
Presented by: Sega, Chin_Chin Brothers

(According to Sega Ages 2500 Vol. 21, Masaki Kondo (近藤 正樹) was a "Designer", Katsumi Tojo (藤乗 勝巳) was the "main programmer" and Eishi Kawatake (川竹 英士) was also a programmer. All three worked on Galaxy Force too).

Commodore 64 Version

(C)1988 Activision
Software Studios
Produced by Neil Jackson
Coding Graphics and Music was Produced by Source the Software House Ltd
Artwork by Bryn Redman, Ross Harris
Music Composed by Paul Summers
Programming by Mike Chilton

Promotional Material

Physical Scans

Arcade Version

System 16, JP

Master System version







































































































































































Sega Master System 77 Sega Retro Average
Based on 8 reviews
Publication Score Source
ACE 62 №14, p49
Complete Guide to Consoles 79 №1, p57
Complete Guide to Consoles 80 №4, p97
Computer & Video Games 80 №78, p122/123
The Games Machine (UK) 81 №5, p43
S: The Sega Magazine 78 №8, p12
Sega Power 80 №23, p57
Sega Pro 78 №3, p19
Master System, US
GlobalDefense SMS US Box.jpg

Cover

GlobalDefense SMS US Cart.jpg
Cart
Globaldefense sms us manual.pdf
Manual
SegaAdventure SMS US Poster Front.jpg
Poster (front)
SegaAdventure SMS US Poster Back.jpg
Poster (back)
Master System, EU
SDI SMS EU cover.jpg

Cover

Master System, EU
"no limits" variant
SDI SMS EU nolimits cover.jpg

Cover

Master System, EU
® variant
SDI SMS EU R cover.jpg

Cover

Master System, JP
SDI SMS JP Box Back.jpgNospine.pngSDI SMS JP cover.jpg

Cover

SDI SMS JP Cart.jpg
Cart
SDISMSJPManual.pdf
Manual
Master System, AU
GlobalDefense SMS AU Cart.jpg
Cart
Master System, KR
SDI SMS KR cart.jpg
Cart

Amiga Version







































































































































































Commodore Amiga 57 Sega Retro Average
Based on 1 review
Publication Score Source
The Games Machine (UK) 57 №22, p91
Amiga, UK

Amstrad CPC Version







































































































































































Amstrad CPC 29 Sega Retro Average
Based on 1 review
Publication Score Source
The Games Machine (UK) 29 №18, p43
Amstrad CPC, UK
Amstrad CPC, UK
(The Hit Squad)
SDI CPC EU Box THS.jpg

Cover

Amstrad CPC, ES
SDI CPC ES Box MCM.jpg

Cover

Atari ST Version







































































































































































Atari ST 74 Sega Retro Average
Based on 3 reviews
Publication Score Source
ACE 84
Computer & Video Games 81 №86
The Games Machine (UK) 56 №14, p81
Atari ST, UK

Commodore 64 Version







































































































































































Commodore 64 61 Sega Retro Average
Based on 3 reviews
Publication Score Source
Computer & Video Games 54 №116
Computer & Video Games 72 №118
The Games Machine (UK) 56 №18, p43
Amiga, UK (cassette)
Amiga, UK (disk)
Commodore 64, UK
(The Hit Squad)
SDI C64 EU Box THS.jpg

Cover

ZX Spectrum Version







































































































































































ZX Spectrum 48 Sega Retro Average
Based on 2 reviews
Publication Score Source
Computer & Video Games 59 №116
The Games Machine (UK) 37 №18, p43
ZX Spectrum, UK
SDI Spectrum EU Inlay.jpg

Cover

ZX Spectrum, UK
(The Hit Squad)
SDI Spectrum EU Box THS.jpg

Cover

ZX Spectrum, ES
SDI Spectrum ES Box MCM.jpg

Cover