Data Design Interactive: Difference between revisions

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[[File:Crash Astrocade.jpg|thumb|220px|Stewart Green advertising ''The Astrocade Collection'']]
[[File:Crash Astrocade.jpg|thumb|220px|Stewart Green advertising ''The Astrocade Collection'']]
Development of ''The Astrocade Collection'' concluded in late 1985.<ref name="DDI history"/><ref name="Alien"/> It contained three previously-developed games, ''Alien'', ''Bomber'', and ''Luna-Rover'', as well as three original games, ''Caverns d'Or'', ''Simeon'', and ''Zombie Island''.<ref name="PCW 518"/><ref name="YS07"/> The collection's development ended up costing £3000. Green priced ''Astrocade'' at £4.50, but had difficulty distributing it; most distributors did not respond to him, and [[Wikipedia:WHSmith|Smith's]] wanted the the product to have a [[Wikipedia:Barcode|barcode]], which would cost him another £100. He initially sold copies of ''Astrocade'' by offering them on sale at local computer shops.<ref name="Crash 28"/> Lacking a budget for advertising, he sent copies of the collection packaged with a [[Wikipedia:Mars (chocolate bar)|Mars bar]] to computer magazines to encourage reviews.<ref name="Crash 27"/> An earlier version of ''Alien'' was also published as machine code in the February 1986 issue of [[Wikipedia:Your Sinclair|''Your Sinclair'']].<ref name="YS02"/> Graeme Kidd from the ZX Spectrum magazine [[wikipedia:Crash (magazine)|''CRASH'']] interviewed Stewart Green at Data Design, which at the time was operated out of the front room of his house in [[wikipedia:Halesowen|Halesowen]]. The interview was published in the May 1986 issue of ''CRASH''; by that point, Green had sold only around one hundred copies of ''Astrocade''.<ref name="Crash 28"/> Following this, Green advertised the collection through various computer magazines, giving an address for viewers to [[wikipedia:mail order|mail order]] the game from.<ref name="YS07"/> Green intended for Astrocade to supply him with funds while he developed a larger project. He announced the development of a [[Wikipedia:Play-by-mail game|play-by-mail game]] in his interview with ''CRASH''; Green believed that the previous summer had been the last chance for self-employed developers to start in the software market, and claimed that small software developers offered the best service for play-by-mail games.<ref name="Crash 28"/>
Development of ''The Astrocade Collection'' concluded in late 1985.<ref name="DDI history"/><ref name="Alien"/> It contained three previously-developed games, ''Alien'', ''Bomber'', and ''Luna-Rover'', as well as three original games, ''Caverns d'Or'', ''Simeon'', and ''Zombie Island''.<ref name="PCW 518"/><ref name="YS07"/> The collection's development ended up costing £3000. Green priced ''Astrocade'' at £4.50, but had difficulty distributing it; most distributors did not respond to him, and [[Wikipedia:WHSmith|Smith's]] wanted the the product to have a [[Wikipedia:Barcode|barcode]], which would cost him another £100. He initially sold copies of ''Astrocade'' by offering them on sale at local computer shops.<ref name="Crash 28"/> Lacking a budget for advertising, he sent copies of the collection packaged with a [[Wikipedia:Mars (chocolate bar)|Mars bar]] to computer magazines to encourage reviews.<ref name="Crash 27"/> An earlier version of ''Alien'' was also published as machine code in the February 1986 issue of [[Wikipedia:Your Sinclair|''Your Sinclair'']].<ref name="YS02"/> Graeme Kidd from the ZX Spectrum magazine [[wikipedia:Crash (magazine)|''CRASH'']] interviewed Stewart Green at Data Design, which at the time was operated out of the front room of his house in [[wikipedia:Halesowen|Halesowen]]. The interview was published in the May 1986 issue of ''CRASH''; by that point, Green had sold only around one hundred copies of ''Astrocade''.<ref name="Crash 28"/> Following this, Green advertised the collection through various computer magazines, giving an address for viewers to [[wikipedia:mail order|mail order]] the game from.<ref name="YS07"/>


''The Astrocade Collection'' recieved mixed reviews from contemporary magazines. Reviewers criticised the quality and originality of the games in the collection, though were more positive about the collection's low price and the overall value per game, as well as the collection being Data Design's first major publication.<ref name="PCW 518"/><ref name="YS07"/><ref name="Crash 29"/><ref name="CG15"/> Stewart Green responded with appreciation for the reviews, though he disagreed that games lacking originality was an issue and criticised ''Popular Computing Weekly'''s claim that ''Luna-Rover'' had graphics resembling a [[Wikipedia:ZX81|ZX81]] game.<ref name="PCW 526"/> From July 1986 onward, Data Design lowered the cost of ''Astrocade'' to £1.99 (plus 40p for postage and packaging).<ref name="CG16"/><ref name="YS09"/>
''The Astrocade Collection'' recieved mixed reviews from contemporary magazines. Reviewers criticised the quality and originality of the games in the collection, though were more positive about the collection's low price and the overall value per game, as well as the collection being Data Design's first major publication.<ref name="PCW 518"/><ref name="YS07"/><ref name="Crash 29"/><ref name="CG15"/> Stewart Green responded with appreciation for the reviews, though he disagreed that games lacking originality was an issue and criticised ''Popular Computing Weekly'''s claim that ''Luna-Rover'' had graphics resembling a [[Wikipedia:ZX81|ZX81]] game.<ref name="PCW 526"/> From July 1986 onward, Data Design lowered the cost of ''Astrocade'' to £1.99 (plus 40p for postage and packaging).<ref name="CG16"/><ref name="YS09"/>
Green intended for ''Astrocade'' to supply him with funds while he developed a larger project. He announced the development of a [[Wikipedia:Play-by-mail game|play-by-mail game]] in his interview with ''CRASH''; Green believed that the previous summer had been the last chance for self-employed developers to start in the software market, and claimed that small software developers offered the best service for play-by-mail games.<ref name="Crash 28"/> Other Spectrum software Green developed and released around the same time as ''Astrocade'' included ''Space Fright'', a reskin of ''Alien'',<ref name="YC14"/> ''Invadas'', a [[Wikipedia:Space Invaders|''Space Invaders'']] clone,<ref name="YS07 code"/> and ''Elite Editor'', an editor for the ZX Spectrum version of [[Wikipedia:Elite (video game)|''Elite'']].<ref name="Crash 31"/><ref name="YS09 p93"/> Data Design Systems also published programs for ZX Spectrum software development, including ''BASIC +'', a collection of six programs for writing software in [[wikipedia:BASIC|BASIC]], in 1986,<ref name="YS09 p93"/><ref name="YS13"/> and ''Sprite Designer'', ''Printer'', and ''64 Column Display'' in 1987.<ref name="YS14"/> ''BASIC +'' was originally released for £5.99, later increased to £12; following the release of the other three programs it was priced at £10 while the others were available for £6 each, or all four could be purchased together for £14.<ref name="YS09 p93"/><ref name="YS13"/><ref name="YS14"/>


== References ==
== References ==
{{Reflist|refs=
{{Reflist|refs=
<ref name="Alien">Green, Stewart (1 November 1985). ''Alien'' (''Astrocade'' version). Data Design Systems. Title screen. "© 1.11.85".</ref>
<ref name="Alien">Green, Stewart (1 November 1985). ''Alien'' (''Astrocade'' version). Data Design Systems. Title screen. "© 1.11.85".</ref>
<ref name="Animation World">Younghusband, Paul (February 2001). [https://www.awn.com/mag/issue5.11/5.11pages/younghusbandartworld.php3 "A One Stop Digital Shop: Data Design Interactive and Artworld UK"]. [[Wikipedia:Animation World|''Animation World Magazine'']]. Vol. 5, No. 11. AWN, Inc. [https://web.archive.org/web/20230118045641/https://www.awn.com/mag/issue5.11/5.11pages/younghusbandartworld.php3 Archived] from the original on 18 January 2023. Mirror available at [https://www.awn.com/animationworld/one-stop-digital-shop-data-design-interactive-and-artworld-uk Animation World Network].</ref>
<ref name="Animation World">Younghusband, Paul (February 2001). [https://www.awn.com/mag/issue5.11/5.11pages/younghusbandartworld.php3 "A One Stop Digital Shop: Data Design Interactive and Artworld UK"]. [[Wikipedia:Animation World|''Animation World Magazine'']]. Vol. 5, No. 11. AWN, Inc. [https://web.archive.org/web/20230118045641/https://www.awn.com/mag/issue5.11/5.11pages/younghusbandartworld.php3 Archived] from the original on 18 January 2023. Mirror available at [https://www.awn.com/animationworld/one-stop-digital-shop-data-design-interactive-and-artworld-uk Animation World Network].</ref>
<ref name="CG15">Hetherington, Tony (June 1986). [https://archive.org/details/Computer_Gamer_Issue_15_1986-06_Argus_Press_GB/page/n38/mode/1up?view=theater "Adventure Reviews"]. [[wikipedia:Computer Gamer|''Computer Gamer'']]. No. 15. [[Wikipedia:Newsfield|Newsfield Publications Ltd]]. p. 39.</ref>
<ref name="CG15">Hetherington, Tony (June 1986). [https://archive.org/details/Computer_Gamer_Issue_15_1986-06_Argus_Press_GB/page/n38/mode/1up?view=theater "Adventure Reviews"]. [[wikipedia:Computer Gamer|''Computer Gamer'']]. No. 15. [[Wikipedia:Newsfield|Newsfield Publications Ltd]]. p. 39.</ref>
Line 23: Line 24:
<ref name="Crash 28">Kidd, Graeme (May 1986). [https://www.crashonline.org.uk/28/dds.htm "This Little Proggy Went To Market..."]. [[wikipedia:Crash (magazine)|''CRASH'']] - The Online Edition. No. 28. [[Wikipedia:Newsfield|Newsfield Publications Ltd]]. p. 76. [https://web.archive.org/web/20230625034910/https://www.crashonline.org.uk/28/dds.htm Archived] from the original on 25 June 2023.</ref>
<ref name="Crash 28">Kidd, Graeme (May 1986). [https://www.crashonline.org.uk/28/dds.htm "This Little Proggy Went To Market..."]. [[wikipedia:Crash (magazine)|''CRASH'']] - The Online Edition. No. 28. [[Wikipedia:Newsfield|Newsfield Publications Ltd]]. p. 76. [https://web.archive.org/web/20230625034910/https://www.crashonline.org.uk/28/dds.htm Archived] from the original on 25 June 2023.</ref>
<ref name="Crash 29">Kidd, Graeme (June 1986). [https://archive.org/details/crash-magazine-29/page/n97/mode/2up?view=theater "The Games Gatherings"]. [[wikipedia:Crash (magazine)|''CRASH'']]. No. 29. [[Wikipedia:Newsfield|Newsfield Publications Ltd]]. pp. 98–99.</ref>
<ref name="Crash 29">Kidd, Graeme (June 1986). [https://archive.org/details/crash-magazine-29/page/n97/mode/2up?view=theater "The Games Gatherings"]. [[wikipedia:Crash (magazine)|''CRASH'']]. No. 29. [[Wikipedia:Newsfield|Newsfield Publications Ltd]]. pp. 98–99.</ref>
<ref name="Crash 31">Green, Stewart (August 1986). [https://archive.org/details/crash-magazine-31/page/n58/mode/1up?view=theater "Six games for £1.99"]. [[wikipedia:Crash (magazine)|''CRASH'']]. No. 31. [[Wikipedia:Newsfield|Newsfield Publications Ltd]]. p. 59.</ref>
<ref name="DDI history">[https://web.archive.org/web/20041216050634/http://www.datadesign.uk.com/history_page.htm History]. ''datadesign.uk.com''. Data Design Interactive. Archived from the original on 16 December 2004.</ref>
<ref name="DDI history">[https://web.archive.org/web/20041216050634/http://www.datadesign.uk.com/history_page.htm History]. ''datadesign.uk.com''. Data Design Interactive. Archived from the original on 16 December 2004.</ref>
<ref name="Inc">Dellheim, Charles (1 July 1996). [https://www.inc.com/magazine/19960701/1725.html "Thatcher's Self Employment"]. [[Wikipedia:Inc. (magazine)|''Inc.'']] [https://web.archive.org/web/20030415171759/http://www.inc.com/magazine/19960701/1725.html Archived] from the original on 15 April 2003. Retrieved 25 June 2023.</ref>
<ref name="Inc">Dellheim, Charles (1 July 1996). [https://www.inc.com/magazine/19960701/1725.html "Thatcher's Self Employment"]. [[Wikipedia:Inc. (magazine)|''Inc.'']] [https://web.archive.org/web/20030415171759/http://www.inc.com/magazine/19960701/1725.html Archived] from the original on 15 April 2003. Retrieved 25 June 2023.</ref>
<ref name="PCW 518">Taylor, Graham (1 May 1986). [https://archive.org/details/popular-computing-weekly-1986-05-01/page/n59/mode/2up?view=theater "New releases"]. [[Wikipedia:Popular Computing Weekly|''Popular Computing Weekly'']]. Vol. 5 No. 18. [[Wikipedia:Sunshine Publications|Sunshine Publications]]. pp. 44–45.</ref>
<ref name="PCW 518">Taylor, Graham (1 May 1986). [https://archive.org/details/popular-computing-weekly-1986-05-01/page/n59/mode/2up?view=theater "New releases"]. [[Wikipedia:Popular Computing Weekly|''Popular Computing Weekly'']]. Vol. 5 No. 18. [[Wikipedia:Sunshine Publications|Sunshine Publications]]. pp. 44–45.</ref>
<ref name="PCW 526">Green, Stewart (26 June 1986). [https://archive.org/details/popular-computing-weekly-1986-06-26/page/n9/mode/1up?view=theater "Review reaction"]. [[Wikipedia:Popular Computing Weekly|''Popular Computing Weekly'']]. Vol. 5 No. 26. [[Wikipedia:Sunshine Publications|Sunshine Publications]]. p. 10.</ref>
<ref name="PCW 526">Green, Stewart (26 June 1986). [https://archive.org/details/popular-computing-weekly-1986-06-26/page/n9/mode/1up?view=theater "Review reaction"]. [[Wikipedia:Popular Computing Weekly|''Popular Computing Weekly'']]. Vol. 5 No. 26. [[Wikipedia:Sunshine Publications|Sunshine Publications]]. p. 10.</ref>
<ref name="YS02">Cox, Kevin (ed.) (February 1986). [https://archive.org/details/Your_Sinclair_002/page/48/mode/1up?view=theater "Alien by Stewart Green"]. [[Wikipedia:Your Sinclair|''Your Sinclair'']]
<ref name="YC14">Evans, Gary (ed.) (May 1986). [https://archive.org/details/your-computer-magazine-1986-05/page/n65/mode/1up?view=theater "Software Exchange"]. [[Wikipedia:Your Computer (British magazine)|''Your Computer'']]. Vol. 6 No. 5. Focus Investments Ltd. p. 66.</ref>
Issue 2. [[Wikipedia:Dennis Publishing|Sportscene Specialist Press]]. pp. 48–52.</ref>
<ref name="YS02">Cox, Kevin (ed.) (February 1986). [https://archive.org/details/Your_Sinclair_002/page/48/mode/1up?view=theater "Alien by Stewart Green"]. [[Wikipedia:Your Sinclair|''Your Sinclair'']]. Issue 2. [[Wikipedia:Dennis Publishing|Sportscene Specialist Press]]. pp. 48–52.</ref>
<ref name="YS07">Phillips, Max (July 1986). [https://archive.org/details/Your_Sinclair_007/page/61/mode/1up?view=theater "Screen Shots"]. [[Wikipedia:Your Sinclair|''Your Sinclair'']]
<ref name="YS07">Phillips, Max (July 1986). [https://archive.org/details/Your_Sinclair_007/page/61/mode/1up?view=theater "Screen Shots"]. [[Wikipedia:Your Sinclair|''Your Sinclair'']]. Issue 7. [[Wikipedia:Dennis Publishing|Sportscene Specialist Press]]. p. 61.</ref>
Issue 7. [[Wikipedia:Dennis Publishing|Sportscene Specialist Press]]. p. 61.</ref>
<ref name="YS07 code">Cox, Kevin (ed.) (July 1986). https://archive.org/details/Your_Sinclair_007/page/48/mode/1up?view=theater "Invadas by Stewart Green"]. [[Wikipedia:Your Sinclair|''Your Sinclair'']]. Issue 7. p. 48.</ref>
<ref name="YS09">South, Phil (September 1986). [https://archive.org/details/Your_Sinclair_009/page/n7/mode/1up?view=theater "Frontlines"]. [[Wikipedia:Your Sinclair|''Your Sinclair'']]
<ref name="YS09">South, Phil (September 1986). [https://archive.org/details/Your_Sinclair_009/page/n7/mode/1up?view=theater "Frontlines"]. [[Wikipedia:Your Sinclair|''Your Sinclair'']]. Issue 9. [[Wikipedia:Dennis Publishing|Sportscene Specialist Press]]. p. 5.</ref>
Issue 9. [[Wikipedia:Dennis Publishing|Sportscene Specialist Press]]. p. 5.</ref>
<ref name="YS09 p93">Green, Stewart (September 1986). [https://archive.org/details/Your_Sinclair_009/page/n95/mode/1up?view=theater "Data Design"]. [[Wikipedia:Your Sinclair|''Your Sinclair'']]. Issue 9. p. 93.</ref>
<ref name="YS13">Green, Stewart (January 1987). [https://archive.org/details/Your_Sinclair_013/page/n124/mode/1up?view=theater "Data Design"]. [[Wikipedia:Your Sinclair|''Your Sinclair'']]. Issue 13. [[Wikipedia:Dennis Publishing|Sportscene Specialist Press]]. p. 123.</ref>
<ref name="YS14">Green, Stewart (February 1987). [https://archive.org/details/Your_Sinclair_014/page/100/mode/1up?view=theater "D.D.S. The Programming Specialists"]. [[Wikipedia:Your Sinclair|''Your Sinclair'']]. Issue 14. [[Wikipedia:Dennis Publishing|Sportscene Specialist Press]]. p. 100.</ref>
}}
}}


[[Category:Video game companies]]
[[Category:Video game companies]]

Revision as of 21:13, 27 June 2023

Data Design Interactive was a British video game company. Founded in 1983 by Stewart Green as Data Design Systems, the company started off creating budget software for the ZX Spectrum.

History

I decided I wanted to break into the budget software market — I think the software industry could be killing itself with the £10 game. Budget software like Cascade's 50 Games compilation, has got to be value for money — if you only play each game on a 50 game compilation for ten minutes, then you’ve had over a day’s solid entertainment.

Stewart Green, CRASH[1]

Data Design Systems was founded in 1983 by Stewart Green.[1][2][3] Green had purchased a ZX Spectrum soon after its release the previous year, and had spent his free time learning how to program on it before leaving his engineering apprenticeship to pursue a career in software development. He attempted to sell two of his earliest games, Alien and Bomber, for £2 each at computer shows. After selling only a small number of copies, he decided that a compilation of multiple games on one cassette tape would sell better than individual games, as well as allow him to charge a higher price for the tape and let shops take in a larger profit margin.[1]

Green applied for the UK government’s Enterprise Allowance Scheme, an initiative which gave an income of £40 per week for one year to anyone unemployed who wanted to set up their own business and had £1000 of their own funds to invest in the project.[1][4] Deciding to develop for the budget software market, he began work on Astrocade, a collection of six games on one tape. At the same time, he was finding out how to package games properly and learning business practices from his three free interviews with the Business Advice Centre that the Enterprise Allowance Scheme allowed him. Green wanted the compilation to be sold in a large package; he initially planned to use the same cardboard boxes that Beyond Software games used, before he found out that the cardboard dies for that would cost at least £800 and decided to use video boxes instead. Not wanting to pay "hundreds of pounds for a simple piece of artwork," Green got an art student from a local school to create box art for free as portfolio work. Getting game screenshots took two weeks due to the photographer hired not knowing how to take photographs of a television screen.[1]

Stewart Green advertising The Astrocade Collection

Development of The Astrocade Collection concluded in late 1985.[2][5] It contained three previously-developed games, Alien, Bomber, and Luna-Rover, as well as three original games, Caverns d'Or, Simeon, and Zombie Island.[6][7] The collection's development ended up costing £3000. Green priced Astrocade at £4.50, but had difficulty distributing it; most distributors did not respond to him, and Smith's wanted the the product to have a barcode, which would cost him another £100. He initially sold copies of Astrocade by offering them on sale at local computer shops.[1] Lacking a budget for advertising, he sent copies of the collection packaged with a Mars bar to computer magazines to encourage reviews.[8] An earlier version of Alien was also published as machine code in the February 1986 issue of Your Sinclair.[9] Graeme Kidd from the ZX Spectrum magazine CRASH interviewed Stewart Green at Data Design, which at the time was operated out of the front room of his house in Halesowen. The interview was published in the May 1986 issue of CRASH; by that point, Green had sold only around one hundred copies of Astrocade.[1] Following this, Green advertised the collection through various computer magazines, giving an address for viewers to mail order the game from.[7]

The Astrocade Collection recieved mixed reviews from contemporary magazines. Reviewers criticised the quality and originality of the games in the collection, though were more positive about the collection's low price and the overall value per game, as well as the collection being Data Design's first major publication.[6][7][10][11] Stewart Green responded with appreciation for the reviews, though he disagreed that games lacking originality was an issue and criticised Popular Computing Weekly's claim that Luna-Rover had graphics resembling a ZX81 game.[12] From July 1986 onward, Data Design lowered the cost of Astrocade to £1.99 (plus 40p for postage and packaging).[13][14]

Green intended for Astrocade to supply him with funds while he developed a larger project. He announced the development of a play-by-mail game in his interview with CRASH; Green believed that the previous summer had been the last chance for self-employed developers to start in the software market, and claimed that small software developers offered the best service for play-by-mail games.[1] Other Spectrum software Green developed and released around the same time as Astrocade included Space Fright, a reskin of Alien,[15] Invadas, a Space Invaders clone,[16] and Elite Editor, an editor for the ZX Spectrum version of Elite.[17][18] Data Design Systems also published programs for ZX Spectrum software development, including BASIC +, a collection of six programs for writing software in BASIC, in 1986,[18][19] and Sprite Designer, Printer, and 64 Column Display in 1987.[20] BASIC + was originally released for £5.99, later increased to £12; following the release of the other three programs it was priced at £10 while the others were available for £6 each, or all four could be purchased together for £14.[18][19][20]

References

  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Kidd, Graeme (May 1986). "This Little Proggy Went To Market...". CRASH - The Online Edition. No. 28. Newsfield Publications Ltd. p. 76. Archived from the original on 25 June 2023.
  2. 2.0 2.1 History. datadesign.uk.com. Data Design Interactive. Archived from the original on 16 December 2004.
  3. Younghusband, Paul (February 2001). "A One Stop Digital Shop: Data Design Interactive and Artworld UK". Animation World Magazine. Vol. 5, No. 11. AWN, Inc. Archived from the original on 18 January 2023. Mirror available at Animation World Network.
  4. Dellheim, Charles (1 July 1996). "Thatcher's Self Employment". Inc. Archived from the original on 15 April 2003. Retrieved 25 June 2023.
  5. Green, Stewart (1 November 1985). Alien (Astrocade version). Data Design Systems. Title screen. "© 1.11.85".
  6. 6.0 6.1 Taylor, Graham (1 May 1986). "New releases". Popular Computing Weekly. Vol. 5 No. 18. Sunshine Publications. pp. 44–45.
  7. 7.0 7.1 7.2 Phillips, Max (July 1986). "Screen Shots". Your Sinclair. Issue 7. Sportscene Specialist Press. p. 61.
  8. Mangram, Lloyd (April 1986). "Merely Mangram". CRASH. No. 27. Argus Specialist Publications. p. 112.
  9. Cox, Kevin (ed.) (February 1986). "Alien by Stewart Green". Your Sinclair. Issue 2. Sportscene Specialist Press. pp. 48–52.
  10. Kidd, Graeme (June 1986). "The Games Gatherings". CRASH. No. 29. Newsfield Publications Ltd. pp. 98–99.
  11. Hetherington, Tony (June 1986). "Adventure Reviews". Computer Gamer. No. 15. Newsfield Publications Ltd. p. 39.
  12. Green, Stewart (26 June 1986). "Review reaction". Popular Computing Weekly. Vol. 5 No. 26. Sunshine Publications. p. 10.
  13. Astrocade advertisement. Computer Gamer. No. 16, July 1986. Newsfield Publications Ltd. p. 29.
  14. South, Phil (September 1986). "Frontlines". Your Sinclair. Issue 9. Sportscene Specialist Press. p. 5.
  15. Evans, Gary (ed.) (May 1986). "Software Exchange". Your Computer. Vol. 6 No. 5. Focus Investments Ltd. p. 66.
  16. Cox, Kevin (ed.) (July 1986). https://archive.org/details/Your_Sinclair_007/page/48/mode/1up?view=theater "Invadas by Stewart Green"]. Your Sinclair. Issue 7. p. 48.
  17. Green, Stewart (August 1986). "Six games for £1.99". CRASH. No. 31. Newsfield Publications Ltd. p. 59.
  18. 18.0 18.1 18.2 Green, Stewart (September 1986). "Data Design". Your Sinclair. Issue 9. p. 93.
  19. 19.0 19.1 Green, Stewart (January 1987). "Data Design". Your Sinclair. Issue 13. Sportscene Specialist Press. p. 123.
  20. 20.0 20.1 Green, Stewart (February 1987). "D.D.S. The Programming Specialists". Your Sinclair. Issue 14. Sportscene Specialist Press. p. 100.