Data Design Interactive

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Data Design's logo first used in LEGO Rock Raiders

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

History

Formation and early years (1983–1986)

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] The previous year had seen the release of the ZX Spectrum, a British 8-bit home computer that would go on to sell over five million units. While the Spectrum had inferior hardware compared to its competitors like the Commodore 64 and the BBC Micro, the low cost of both the computer and its cassette-based games led to it becoming a successful gaming platform in the United Kingdom.[4] Green had purchased a Spectrum soon after its release, 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]

Luna-Rover, one of Data Design's earliest games

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][5] Deciding to develop for the budget software market, he began work on Astrocade, a collection of six games on one tape. While programming it, he learned how to run a business from three free interviews with the Business Advice Centre that the Enterprise Allowance Scheme gave 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, until 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] The games were compiled with ZIP,[6] a Sinclair BASIC compiler developed by Simon N. Goodwin.[7]

Stewart Green advertising The Astrocade Collection

Development of The Astrocade Collection concluded in late 1985.[2][8] It contained three previously-developed games: Alien, a fixed shooter game, Bomber, a City Bomber-like game, and Luna-Rover, a Moon Patrol clone; as well as three original games: Caverns d'Or, an adventure game, Simeon, a Simon clone, and Zombies, an action game.[9][10] 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.[11] An earlier version of Alien was also published as type-in machine code in the February 1986 issue of Your Sinclair.[12] 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.[9] Green later stated that the interview was a "great help" to him.[13]

The Astrocade Collection received 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 about the collection being Data Design's first major publication.[9][10][14][15] Stewart Green responded with appreciation for the reviews, though he disagreed with the originality of the games being an issue (saying "How many Exploding Fists are there now?" in response) and criticised Popular Computing Weekly's claim that Luna-Rover had graphics resembling those of a ZX81 game.[16] From July 1986 onward, Data Design lowered the cost of Astrocade to £1.99 (plus 40p for postage and packaging).[17][18]

1987 Data Design logo

Green intended for Astrocade to supply him with funds while he developed a larger project. His plans included a play-by-mail game that would support a hundred players via computer; Green believed that the previous summer had been the last chance for self-employed developers to start in the software market, and that there was still a chance to succeed in the play-by-mail field (which he claimed small software developers offered the best service for).[1] Other Spectrum titles Green developed and released during 1985–1986[2] included Death Duel, a Tron-inspired Snake game,[19] Invadas, a Galaxian clone,[20] Space Fright, a remake of his earlier game Alien,[21] and Elite Editor, an editor for the ZX Spectrum version of David Braben and Ian Bell's Elite.[22][23] 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,[23][24] and Sprite Designer, Printer, and 64 Column Display in 1987.[25] BASIC + was originally released for £5.99,[23] later increased to £12;[24] 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.[25]

  • Alien

    Alien

  • Bomber

    Bomber

  • Caverns d'Or

    Caverns d'Or

  • Simeon

    Simeon

  • Zombies

    Zombies

  • Death Duel

    Death Duel

  • Invadas

    Invadas

  • Space Fright

    Space Fright

  • Elite Editor title screen

    Elite Editor title screen

  • Sprite editor in BASIC +

    Sprite editor in BASIC +

Freelance programming (1986–199X)

In his interview with CRASH, Stewart Green expressed concern that he may have to take up freelance work to survive as a small software house.[1] Following the interview, Green moved on to developing software for other companies. Many of his first freelance jobs were strategy games, which he enjoyed playing and programming, for Personal Software Services (PSS).[13] Founded in 1981 by Gary Mays and Richard Cockayne, the company was known for its Wargamers series, a string of loosely-connected turn-based strategy wargames started by senior programmer Alan Steel's 1984 game Battle for Midway.[26] Green developed conversions of three Wargamers games, including two World War II-themed ones.[2] PSS was purchased by Mirrorsoft in February 1987.[27]

Losing a battle in Annals of Rome

One of Green's first freelance jobs was programming the ZX Spectrum version of Annals of Rome,[13][2] a turn-based strategy game that puts the player in control of the Roman army's military conquests over the course of centuries.[28] The game was designed by Dr. George Jaroszkiewicz, who wanted to create a historical simulation as an "exercise in socio-economic modelling."[29][30] Jaroszkiewicz originally programmed the game for Amstrad CPC 464, and Personal Software Services hired other programmers to convert it to other home computer platforms.[30][31] Believing that video games were seen as "not something for grown men to dabble in," Jaroszkiewicz left his name out of the game, using the alias "Rome Software" instead; Green's Spectrum port, however, credits Jaroszkiewicz (as E.M. Jaroszkiewicz) as its designer in-game.[30][32] The Spectrum version of the game released in November 1986.[33] CRASH's Philippa Irving rated it positively, praising its attention to detail, but criticised its presentation and long periods of waiting during combat, as well as its "entertaining" bugs.[28][31] Tommy Nash of Your Sinclair likewise criticised its speed, which he blamed on it being programmed in BASIC, and called its interface "incomprehensible."[34] Steve Badsey of Computer + Video Games preferred the Spectrum version's graphics over those of the later Commodore 64 release, but reported that it had numerous bugs and frequently generated "impossibly large armies", which PSS allegedly blamed on the Spectrum's random number generator.[35]

An action sequence in Tobruk

Data Design worked on the ZX Spectrum version of Alan Steel's Tobruk.[2] Originally released for Amstrad CPC in September 1986,[36][37] the game is a simulation of the 1942 Battle of Gazala and subsequent Axis capture of Tobruk. The player controls the Axis forces of German field marshal Erwin Rommel; a second player can play as the British forces. During combat, the player can enter an arcade sequence and control a tank in first-person view.[38][39] Stewart Green designed and programmed the action sequence in the game's Spectrum version,[13] Tobruk released for Spectrum in March 1987.[27] Computer Gamer called Tobruk "one of the most enjoyable wargames."[38] Philippa Irving found the game uninteresting, and was particularly negative towards its arcade mode, which she called "stunningly badly designed and unplayable."[39] Green later commented that she must have appreciated his work due to her previously accidentally labelling screenshots of Tobruk as Vulcan.[13] Gary Rook of Sinclair User found the game disappointing and its arcade mode "clumsily executed."[40] ZX Computing Monthly stated the arcade sequence worked well and praised the game overall.[41]

ZX Spectrum version
Amstrad CPC version
Pegasus Bridge on Spectrum (top) and CPC (bottom)

Green redesigned and programmed Pegasus Bridge for both ZX Spectrum and Amstrad CPC from the original Commodore 64 version.[13][42][43] Originally designed by John Bethell, who had previously created Falklands '82,[42][31] Pegasus Bridge is based on the titular bridge's capture by the British 6th Airbone Division early on 6 June 1944, preceding the Normandy landings.[44][43] The player can control either the British troops, landing and capturing bridges and the Merville Battery, or the German army, defending as many positions as possible from capture for the game's 36 turns.[44][45][46] Pegasus Bridge released in October 1987.[47] CRASH's Philippa Irving praised the Spectrum version's design and gameplay, but found it "annoyingly difficult" to control with a keyboard,[31] and later admitted to encountering a bug that crashed the game and prevented her from completing it.[48] Sinclair User gave the game a positive review, criticising only the small size of the map window.[49] Owen and Audrey Bishop of Your Sinclair called the game well-researched, but complained about a bug in the Spectrum version that switched which side the player was controlling, as well as the fast speed of in-game messages.[45] Amstrad Action called the Amstrad CPC version boring, and criticised the lack of sound and sensitive controls.[46]

Following Pegasus Bridge, Data Design ceased developing for PSS and began working with other companies. Data Design developed Magnum Light Pen software for Magnum Electronics in 1987.[2] Stewart Green programmed the ZX Spectrum version of Pogotron,[50] a 1989 game by Artronic where the player controls an astronaut who must rebuild their ship and avoid obsticles while constantly bouncing.[51]

Invasion Force gameplay

In 1987 Green began developing Invasion Force, an original strategy game set during World War II.[2][52][53] The game does not simulate any specific battle, and each side is labelled only as blue or red. The game is divided into fifteen missions; for each one players select which units they will use, choose where to deploy them, and command them around the map to complete their given objective. Player one controls the invading blue army, and player two or the computer tries to stop them as the red army. The game is heavily depended on its instruction manual, as each mission objective must be decoded using the code sheet found in it.[54][53] Invasion Force was published by Cases Computer Simulations for ZX Spectrum in February 1990.[55] An Amstrad CPC version was planned, but was never released.[56] The game received positive reviews. Mark Caswell of CRASH asserted that players new to strategy would find it easy to pick up.[54] Inversely, Jonathan Davies of Your Sinclair recommended it for experienced strategy game players looking for a new experience.[53]

Loopz game type A on Spectrum

In 1990 Stewart Green programmed and created graphics for the ZX Spectrum, Amstrad CPC, and Amstrad PWC versions of Loopz,[2][57] a puzzle game designed by Ian Upton and originally developed for Atari ST.[58] The player creates loops (or "loopz") by linking together the pipe pieces given to them, similar to Pipe Mania. Placing each pipe piece must be done within a time limit, and running out of time causes the player to lose a life. The game has three game types: the default endless mode (A), reaching a target score (B), and recreating specific loop shapes (C).[59][60][61][62] Originally planned for release in October 1990,[63] the Spectrum and Amstrad CPC versions of Loopz were released by Audiogenic Software in February 1991.[60] Nick Roberts of CRASH praised the Spectrum version's graphics and "simple but highly addictive" gampeplay, though he found the default game options to be more frustrating than its alternate game types.[59] Phillip Fisch of Sinclair User reviewed the game positively, finding game type C to be the most interesting.[60] Jonathan Davies of Your Sinclair found its enjoyable but uninteresting, and criticised its graphics and lack of "surprises".[61] Frank O'Connor of Amstrad Action praised the Amstrad CPC version's gameplay and graphics, though found the simultaneous two-player mode to be confusing.[62] Loopz was released on numerous other platforms, including a Game Boy version published by Mindscape.[63]

Play-by-mail games

Green's planned play-by-mail game came to fruition in 1988 with the released of Dark Blades Play By Mail. The game was a play-by-mail adaptation of Dark Blades, a fantasy board wargame by Standard Games and Publications.[13] The game's scenario involved a war between humans and half-ogres; players could choose to play as either species, and as either a trader or a warrior.[64][65] Up to one hundred players could participate on a large hex map with over 25,000 locations.[66][67] Players were given ten tasks to complete, as well as a final quest. The first player to complete the quest would win the game and be awarded a gold-plated dragon statue worth £1000 and free participation in another game.[64][65] An early version of Dark Blades PBM was displayed at the Third British Play by Mail Convention on 20 February 1988. The game was priced at £5 for a boxed set starter and two free turns, with additional turns costing £1.25 each.[68] The game used software, programmed by Stewart Green, that ran on Atari 1040ST computers with hard drives.[65] The game was the first play-by-mail game published by Standard Games. Tony Ross of ACE reviewed Dark Blades positively, only criticising its slow start.[69] While asking CRASH's Philippa Irving about joining her own play-by-mail game, Green stated that he wanted to develop a ZX Spectrum version of Dark Blades, if he was able to "cram all the megabytes of data from hard disk down to a Spectrum".[13]

Around the same time Dark Blades was released, the play-by-mail title Skullball was launched. Designed by On The Brink, the game put players in charge of a "skullball" team in a football management-like game and cost £8.50 for ten turns.[70][71] By 1989 the game had a waiting list of around three hundred interested players. On The Brink, unable to keep up with the amount of players, contracted Stewart Green to develop a computer-moderated version of the game that would be easy and fast to play while allowing the game master to customise gameplay. The new version of Skullball was released in May 1989, featuring a new rule book printed in colour and Green's software for Atari ST and IBM PC compatibles.[70][2] Active Games, a then-new play-by-mail company based in Halesowen, ran the computer-moderated version of the game, and had plans to produce new games and market games by other companies.[70] In 1990 Data Design also developed PC compatible software for a play-by-mail game titled Europa for Active Games.[2]

Growth as Data Design Interactive (199x–1997)

Robocod, Pinkie, Rise of the Robots, Conquest Earth

Games

As Data Design Systems

Year Title Publisher Platform(s) Notes
Computer Console Handheld
1985 Alien self-published ZX Spectrum[2] — — Also released as type-in program[12]
Bomber[1] ZX Spectrum — —
Luna-Rover ZX Spectrum[2] — —
Mega-Mazing[2] ZX Spectrum — — Compilation
The Astrocade Collection ZX Spectrum[2] — — Compilation[1]
1986 Death Duel[19] ZX Spectrum — — Type-in program
Invadas ZX Spectrum — — Also released as type-in program[20]
Space Fright[21] ZX Spectrum — —
Annals of Rome Personal Software Services ZX Spectrum[2] — — Port
1987 Tobruk ZX Spectrum[27] — — Port; action sequences only[13]
Pegasus Bridge Amstrad CPC, ZX Spectrum[2] — — Port
1988 Dark Blades Play By Mail Standard Games PBM Atari ST[65] — — Play-by-mail software
1989 Pogotron Gamebusters ZX Spectrum — — Port
Skullball Active Games PBM Atari ST, IBM PC[2] — — Play-by-mail software
1990 Europa IBM PC[2] — — Play-by-mail software
Invasion Force[55] Cases Computer Simulations ZX Spectrum — —
1991 Loopz[60] Audiogenic Software Amstrad CPC, Amstrad PCW, ZX Spectrum[2] — — Port

As Data Design Interactive Ltd

Cancelled

Year Title Platform(s)
Computer Console Handheld
1990 Invasion Force[56] Amstrad CPC — —

References

  1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 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. ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 2.12 2.13 2.14 2.15 2.16 2.17 2.18 2.19 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. ↑ Mason, Graeme (18 February 2022). "ZX Spectrum at 40: a look back". NME. Archived from the original on 23 June 2023.
  5. ↑ Dellheim, Charles (1 July 1996). "Thatcher's Self Employment". Inc. Archived from the original on 15 April 2003. Retrieved 25 June 2023.
  6. ↑ Green, Stewart (1985). Zombies (ZX Spectrum). Data Design Systems. Title screen. "Credits to: ZIP (Your Spectrum 3-5)".
  7. ↑ Goodwin, Simon (September 2010). "Simon N Goodwin's commercial softography". simon.mooli.org.uk. Archived from the original on 20 July 2023.
  8. ↑ Green, Stewart (1 November 1985). Alien (ZX Spectrum) (Astrocade version). Data Design Systems. Title screen. "© 1.11.85".
  9. ↑ 9.0 9.1 9.2 Phillips, Max (July 1986). "Screen Shots". Your Sinclair. Issue 7. Sportscene Specialist Press. p. 61.
  10. ↑ 10.0 10.1 Kidd, Graeme (June 1986). "The Games Gatherings". CRASH. No. 29. Newsfield Publications Ltd. pp. 98–99.
  11. ↑ Mangram, Lloyd (April 1986). "Merely Mangram". CRASH. No. 27. Argus Specialist Publications. p. 112.
  12. ↑ 12.0 12.1 Cox, Kevin (ed.) (February 1986). "Alien by Stewart Green". Your Sinclair. Issue 2. Sportscene Specialist Press. pp. 48–52.
  13. ↑ 13.0 13.1 13.2 13.3 13.4 13.5 13.6 13.7 13.8 Irving, Philippa (July 1988). "Frontline with Philippa Irving". CRASH - The Online Edition. No. 54. Newsfield Publications Ltd. p. 63. Archived from the original on 28 June 2023.
  14. ↑ Taylor, Graham (1 May 1986). "New releases". Popular Computing Weekly. Vol. 5 No. 18. Sunshine Publications. pp. 44–45.
  15. ↑ Hetherington, Tony (June 1986). "Adventure Reviews". Computer Gamer. No. 15. Newsfield Publications Ltd. p. 39.
  16. ↑ Green, Stewart (26 June 1986). "Review reaction". Popular Computing Weekly. Vol. 5 No. 26. Sunshine Publications. p. 10.
  17. ↑ Astrocade advertisement. Computer Gamer. No. 16, July 1986. Newsfield Publications Ltd. p. 29.
  18. ↑ South, Phil (September 1986). "Frontlines". Your Sinclair. Issue 9. Sportscene Specialist Press. p. 5.
  19. ↑ 19.0 19.1 Cox, Kevin (ed.) (April 1986). "Death Duel". Sinclair User. No. 49. EMAP. pp. 99–100.
  20. ↑ 20.0 20.1 Cox, Kevin (ed.) (July 1986). "Invadas by Stewart Green". Your Sinclair. Issue 7. p. 48.
  21. ↑ 21.0 21.1 Evans, Gary (ed.) (May 1986). "Software Exchange". Your Computer. Vol. 6 No. 5. Focus Investments Ltd. p. 66.
  22. ↑ Green, Stewart (August 1986). "Six games for £1.99" ad. CRASH. No. 31. Newsfield Publications Ltd. p. 59.
  23. ↑ 23.0 23.1 23.2 Green, Stewart (September 1986). "Data Design" ad. Your Sinclair. Issue 9. p. 93.
  24. ↑ 24.0 24.1 Green, Stewart (January 1987). "Data Design" ad. Your Sinclair. Issue 13. Sportscene Specialist Press. p. 123.
  25. ↑ 25.0 25.1 Green, Stewart (February 1987). "D.D.S. The Programming Specialists" ad. Your Sinclair. Issue 14. Sportscene Specialist Press. p. 100.
  26. ↑ Connor, Pete (March 1986). "PSS". Amstrad Action. No. 6. Future Publishing. pp. 97–98.
  27. ↑ 27.0 27.1 27.2 Seeley, Mark (March 1987). "News Input". CRASH. No. 38. Newsfield Publications Ltd. pp. 10–11.
  28. ↑ 28.0 28.1 Irving, Philippa (March 1987). "Frontline with Philippa Irving". CRASH. No. 38. Newsfield Publications Ltd. pp. 77–78.
  29. ↑ Frey, Oliver (ed.) (August 1988). "All This and Barbarians Too". The Games Machine. Issue 9. Newsfield Publications. p. 60.
  30. ↑ 30.0 30.1 30.2 Goodfellow, Troy (17 March 2008). "Annals of Rome – The Designer’s Perspective". Flash of Steel. Archived from the original on 28 June 2023.
  31. ↑ 31.0 31.1 31.2 31.3 Irving, Philippa (December 1987). "Frontline with Philippa Irving". CRASH. No. 47. Newsfield Publications Ltd. pp. 48–49.
  32. ↑ Green, Stewart (1986). Annals of Rome (ZX Spectrum). Data Design Systems. Menu screen. "Design: E.M. Jaroszkiewicz Ph.D / Program: DDS, S. Green".
  33. ↑ Douglas, Jim (January 1987). "What is it Good For?". Sinclair User. No. 58. EMAP. p. 124.
  34. ↑ Nash, Tommy (February 1987). "Annals of Rome". Your Sinclair. Issue 14. Sportscene Specialist Press. p. 85.
  35. ↑ Badsey, Steve (January 1988). "Annals of Rome". Computer + Video Games. Issue 76. Future Publishing. p. 46.
  36. ↑ Courtenay, Tom (November 1986). "Going to battle". Your Computer. Vol. 6 No. 11. Focus Investments Ltd. pp. 50–51.
  37. ↑ Edgeley, Clare (August 1986). "Software Preview". Sinclair User. No. 53. EMAP. p. 98.
  38. ↑ 38.0 38.1 A.H. (May 1987). "Tobruk". Computer Gamer. No. 26. Newsfield Publications Ltd. p. 71.
  39. ↑ 39.0 39.1 Irving, Philippa (May 1987). "Frontline with Philippa Irving". CRASH. No. 40. Newsfield Publications Ltd. pp. 101–102.
  40. ↑ Rook, Gary (June 1987). "Tobruk". Sinclair User. No. 63. EMAP. p. 99.
  41. ↑ Ralph, Bryan (ed.) (May 1987). "Tobruk". ZX Computing Monthly. Argus Specialist. p. 45.
  42. ↑ 42.0 42.1 Green, Stewart (1986). Pegasus Bridge (ZX Spectrum; Amstrad CPC). Data Design Systems. Credits. "Idea by John Bethell. Conversion by DSS. Published by.. PSS. Programmer... STEWART GREEN".
  43. ↑ 43.0 43.1 Badsey, Steve (June 1988). "Pegasus Bridge". Computer + Video Games. Issue 80. Future Publishing. p. 54.
  44. ↑ 44.0 44.1 Irving, Philippa (January 1988). "Frontline with Philippa Irving". CRASH. No. 48. Newsfield Publications Ltd. p. 136.
  45. ↑ 45.0 45.1 Bishop, Owen; Bishop, Audrey (March 1988). "On the War Path". Your Sinclair. Issue 27. Sportscene Specialist Press. pp. 54–55.
  46. ↑ 46.0 46.1 Barrett, Gary (December 1987). "Pegasus Bridge". Amstrad Action. No. 27. Future Publishing. p. 52.
  47. ↑ Dean, Stephen (2 October 1987). "New releases". Popular Computing Weekly. Vol. 6 No. 39. Sunshine Publications. p. 43.
  48. ↑ Irving, Philippa (April 1988). "Frontline with Philippa Irving". CRASH. No. 51. Newsfield Publications Ltd. p. 51.
  49. ↑ Rook, Gary (February 1988). "Pegasus Bridge". Sinclair User. No. 71. EMAP. p. 74.
  50. ↑ Green, Stewart (1986). Pogotron (ZX Spectrum). Gamebusters. Menu screen. "Game: -Scott – Prog-Stew/DDS".
  51. ↑ Gómez, Amalio (ed.) (December 1989). "¡Al ensamblaje!". Microhobby. Núm. 194. Hobby Press. p. 32.
  52. ↑ Green, Stewart (1989). Invasion Force (ZX Spectrum). Data Design Systems. Credits. "Idea by Stewart Green. Conversion by DSS. Published by.. CCS. Programmer... STEWART GREEN".
  53. ↑ 53.0 53.1 53.2 Davies, Jonathan (March 1990). "Invasion Force". Your Sinclair. Issue 51. Sportscene Specialist Press. p. 55.
  54. ↑ 54.0 54.1 Caswell, Mark (March 1990). "Invasion Force". CRASH. No. 74. Newsfield Publications Ltd. p. 42.
  55. ↑ 55.0 55.1 Caswell, Mark (February 1990). "Cannons, Charges, Strategies...". CRASH. No. 73. Newsfield Publications Ltd. p. 28.
  56. ↑ 56.0 56.1 "INVASION FORCE (c) CCS". CPCrulez. Archived from the original on 3 July 2023.
  57. ↑ Green, Stewart (1990). Loopz (Amstrad CPC). Audiogenic. Credits screen. "Designed by Ian Upton; Programming Data Design; Graphics Herman and Stewart; Music by D Whittaker".
  58. ↑ Sumpter, Garth (ed.) (February 1991). "Previews: Loopz". Sinclair User. No. 108. EMAP. p. 78.
  59. ↑ 59.0 59.1 Roberts, Nick (February 1991). "Loopz". CRASH. No. 85. Newsfield Publications Ltd. p. 56.
  60. ↑ 60.0 60.1 60.2 60.3 Fisch, Phillip; Jenkins, Chris (March 1991). "Loopz". Sinclair User. No. 109. EMAP. pp. 14–15.
  61. ↑ 61.0 61.1 Davies, Jonathan (April 1991). "Loopz". Your Sinclair. No. 64. Sportscene Specialist Press. p. 63.
  62. ↑ 62.0 62.1 O'Connor, Frank (April 1991). "Loopz". Amstrad Action. No. 67. Future Publishing. p. 62.
  63. ↑ 63.0 63.1 Cooke, Steve (November 1990). "Loopz". ACE. Issue 38. Future Publishing. p. 67.
  64. ↑ 64.0 64.1 Frey, Oliver (ed.) (June 1988). "Post Haste". The Games Machine. Issue 7. Newsfield Publications. pp. 116–117.
  65. ↑ 65.0 65.1 65.2 65.3 Frey, Oliver (ed.) (July 1988). "Post Haste". The Games Machine. Issue 8. Newsfield Publications. p. 115.
  66. ↑ Kavanagh, Brendon (February 1988). "Convention Coming Soon". CRASH. No. 49. Newsfield Publications Ltd. p. 77.
  67. ↑ Blaine, Richard (June 1988). "Postman's Knock". Your Sinclair. Issue 30. Sportscene Specialist Press. pp. 72–73.
  68. ↑ Kavanagh, Brendon (April 1988). "Oh! What a Lovely Convention". CRASH. No. 51. Newsfield Publications Ltd. p. 41.
  69. ↑ Ross, Tony (October 1988). "Bottoms Up!". ACE. Issue 13. Future Publishing. p. 114.
  70. ↑ 70.0 70.1 70.2 Kidd, Graeme (ed.) (May 1989). "PBM Corner: Skullball". ACE. Issue 20. Future Publishing. p. 114.
  71. ↑ Lacey, Ian (December 1988). "Beginner's Guide to PBM". CRASH. No. 59. Newsfield Publications Ltd. pp. 177–178.
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