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SDI: Strategic Defense Initiative

From Sega Retro

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SDI title.png
SDI: Strategic Defense Initiative
Publisher: Sega,
Commodore Amiga
Amstrad CPC
Atari ST
Commodore 64
ZX Spectrum
Activision
Developer:
System(s): Sega System 16, Sega Master System, Amiga, Amstrad CPC, Atari ST, Commodore 64, ZX Spectrum
Genre: Shoot-'em-Up






























Number of players: 2
Release Date RRP Code
Arcade (System 16)
JP
¥? ?
Arcade (System 16)
US
$? ?








Sega Master System
JP
¥5,000 G-1338
Sega Master System
US
$40.00[1] 5102
Sega Master System
UK
£22.95[2] MK-5102-50
Sega Master System
FR
?F MK-5102-50
Sega Master System
DE
DM ? MK-5102-50
Sega Master System
ES
?Ptas MK-5102-50
Sega Master System
AU
$? ?
Sega Master System
BR
R$? ?
Sega Master System
KR
₩? GB-1338



Commodore Amiga
UK
£24.99 ?
Atari ST
UK
£19.99[3] ?
Amstrad CPC
UK (Cassette)
£9.99 ?
Amstrad CPC
UK (Disk)
£14.99 ?
Amstrad CPC
UK (The Hit Squad)
£2.99 ?
Amstrad CPC
ES (Cassette)
? ?
Commodore 64
UK (Cassette)
£9.99[3] ?
Commodore 64
UK (Disk)
£14.99[3] ?
Commodore 64
UK (The Hit Squad)
£2.99[4] ?
ZX Spectrum
UK (Cassette)
£9.99[3] URK 301
ZX Spectrum
UK (The Hit Squad)
£2.99[5] ?
ZX Spectrum
ES (Cassette)
?Ptas SEC 576



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.

Versions

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


(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


Magazine articles

Main article: SDI: Strategic Defense Initiative/Magazine articles.

Promotional material

{{|}}}}

CVG UK 085.pdfCVG UK 085.pdf

PDF
Print advert in
Computer & Video Games (UK) #85: "November 1988" (1988-10-15)
also published in:
  • ACE (UK) #14: "November 1988" (1988-xx-xx)[6]
{{|}}}}

CVG UK 115.pdf

PDF
Print advert in
Computer & Video Games (UK) #115: "June 1991" (1991-05-11)

Physical scans

System 16 version

System 16, JP

Master System version

Sega Retro Average 
Publication Score Source
62 №14, p49[7]
79 №1, p57[8]
80 №4, p97[9]
80 №78, p122/123[10]
81 №5, p43[11]
65 №4, p93[12]
78 №8, p12[13]
80 №23, p57
78 №3, p19[14]
Sega Master System
76
Based on
9 reviews

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 Back.jpgSegaAdventure SMS US Poster Front.jpg
Poster
Master System, EU
SDI SMS EU cover.jpg
Cover
Master System, EU
® variant
SDI SMS EU R cover.jpg
Cover
Master System, EU
"no limits" variant
SDI SMS EU nolimits cover.jpg
Cover
Master System, JP
SDI SMS JP Box Back.jpgSDI SMS JP Box Spine.jpgSDI 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, BR
GlobalDefense SMS BR Box.jpg
Cover
GlobalDefense SMS BR Cart.jpg
Cart
GlobalDefense SMS BR Manual.pdf
Manual
Master System, KR

SDI SMS KR cart.jpg
Cart

Amiga version

Sega Retro Average 
Publication Score Source
57 №22, p91[15]
Commodore Amiga
57
Based on
1 review

Amiga, UK

Amstrad CPC version

Sega Retro Average 
Publication Score Source
79 №20, p78[16]
49 №54, p36/37[17]
29 №18, p43[18]
Amstrad CPC
52
Based on
3 reviews

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

Sega Retro Average 
Publication Score Source
84 №15, p75[19]
81 №86, p58/59[20]
56 №14, p81[21]
Atari ST
74
Based on
3 reviews

Atari ST, UK

Commodore 64 version

Sega Retro Average 
Publication Score Source
64 №64, p67[22]
54 №116, p81[4]
72 №118, p88[23]
56 №18, p43[18]
64 №47, p21[24]
80 №75, p79/80[25]
84 №57, p51[26]
Commodore 64
68
Based on
7 reviews

Commodore 64, UK (cassette)

Commodore 64, UK (disk)

Commodore 64, UK
(The Hit Squad)
SDI C64 EU Box THS.jpg
Cover

ZX Spectrum version

Sega Retro Average 
Publication Score Source
59 №116, p85[5]
37 №18, p43[18]
70 №113, p42/43[27]
64 №67, p58[28]
ZX Spectrum
58
Based on
4 reviews

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

References