Difference between revisions of "Periscope"

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{{Bob
 
{{Bob
| bobscreen=Periscope_machine1.jpg
+
| logo=Periscope logo.png
| publisher=[[Sega]]
+
| image=Periscope cabinet.jpg
| developer=[[Sega]], [[Namco]]
+
| publisher=[[Sega Enterprises, Ltd.]]
| system={{Arcade}} Electro-mechanical
+
| developer=[[Namco]], [[Sega Production and Engineering Department]]
| players=1
+
| distributor={{company|[[Phonographic Equipment]]|region=UK}}{{fileref|Periscope EM UK flyer.pdf|page=3}}
| genre=
+
| system=Electro-mechanical arcade
| releases={{releases
+
| players=1-3
| arcade_date_jp=1966{{ref|1=[https://books.google.co.uk/books?id=DbFxAgAAQBAJ&pg=PA6 ''Service Games: The Rise and Fall of SEGA'' (page 6)]}}
+
| genre=Shooting{{ref|https://www.sega.jp/history/arcade/product/11561}}
| arcade_date_eu=1967-10{{ref|1=[https://books.google.co.uk/books?id=PigEAAAAMBAJ&pg=PA81 ''Billboard'' (November 25, 1967)]}}
+
| releases={{releasesArcade
| arcade_date_us=1968-03
+
| em_date_jp=1966{{ref|1=[https://books.google.co.uk/books?id=DbFxAgAAQBAJ&pg=PA6 ''Service Games: The Rise and Fall of SEGA'' (page 6)]}}{{ref|https://archive.vn/9AHjG/aea16803e3705af403c2d05070e4b4c6180c8708.jpg|2=https://books.google.co.uk/books/content?id=DbFxAgAAQBAJ&hl=pt-PT&pg=PA6&img=1&zoom=3&sig=ACfU3U3dcZLsxPnbSYJZoZEE_X_yFK2MeA&w=1280}}
 +
| em_date_eu=1966-11{{magref|cb|1966-12-17|65|printpage=65/66}}
 +
| em_date_uk=1966-11{{magref|cb|1966-12-17|65|printpage=65/66}}
 +
| em_date_fr=1967-10{{magref|bb|1967-11-25|77}}
 +
| em_date_us=1968-03{{magref|cb|1973-08-18|50}}{{fileref|CashBox US 1973-08-18.pdf|page=54}}
 +
| em_rrp_us = 1,495{{fileref|CashBox US 1972-02-19.pdf|page=47}}
 
}}
 
}}
 
}}
 
}}
'''''Periscope''''' (ペリスコープ) is a 1966 electro-mechanical [[arcade]] submarine game with the player looking through a periscope to shoot ships manufactured by [[Sega]]. Interior scenery inside the machine is lit up with a blacklight tube.
+
{{stub}}'''''{{PAGENAME}}''''' (ペリスコープ) is a 1966 electro-mechanical [[arcade]] submarines shooting game, with the player looking through a periscope to shoot ships, manufactured by [[Sega Enterprises, Ltd.]]{{ref|https://www.sega.jp/history/arcade/product/11561}} Interior scenery inside the machine is lit up with a blacklight tube.
  
The game is an adaptation of an earlier [[Namco]] arcade game, also called ''Periscope'', released in 1965.
+
The game is an adaptation of an earlier [[Namco]] arcade game, also called ''Periscope'', released in 1965. It was the first electro-mechanical arcade game to incorporate special effects and electronic sound, introducing a new genre of arcade games simulating an audio-visual experience behind a screen. Sega's version was a major milestone in the history of arcade games. It revived the North American arcade industry in the late 1960s, laying the foundation for the arrival of arcade video games in the early 1970s.
  
 
==Gameplay==
 
==Gameplay==
Line 22: Line 27:
  
 
The machine tracks how many torpedoes have been fired and how much tonnage has been sunk. The goal is to sink as many boats as you can using your torpedoes. The game gives you ten torpedoes per play with bonus torpedoes awarded for a perfect score. The boats also may change direction at any time for more challenge. There are also two windows in the front top glass that allow other people to watch the action as you play. Scoring is done with light box scoring (no score reels).
 
The machine tracks how many torpedoes have been fired and how much tonnage has been sunk. The goal is to sink as many boats as you can using your torpedoes. The game gives you ten torpedoes per play with bonus torpedoes awarded for a perfect score. The boats also may change direction at any time for more challenge. There are also two windows in the front top glass that allow other people to watch the action as you play. Scoring is done with light box scoring (no score reels).
 +
 +
==Specifications==
 +
===Dimensions===
 +
====Three-player cabinet====
 +
{{Dimensions|hi=84|wi=156|di=108|diagramsize=150|ref={{fileref|Periscope EM US Flyer 2.pdf|page=3}}}}
 +
====Single cabinet====
 +
{{Dimensions|hi=72|wi=48|di=96|diagramsize=150|ref={{fileref|Periscope flyer1.jpg}}}}
  
 
==History==
 
==History==
 
===Development===
 
===Development===
''Periscope'' was originally manufactured by [[Namco]] in 1965, and was designed by its founder Masaya Nakamura. The Namco version was only released in Japan, and supported three players.
+
''Periscope'' was originally a three-player machine manufactured by [[Namco]] in 1965, and was designed by its founder Masaya Nakamura.{{ref|http://web.archive.org/web/20170418041134/https://twitter.com/onionsoftware/status/604656579934220288}}{{ref|[http://bandainamcoent.co.jp/gallery/ayumi/archive/elemecha/ Elemecha], [[Namco]]}} The game was inspired by a Japanese manga series, ''[[wikipedia:Submarine 707|Submarine 707]]'' (1963–1965).{{ref|[https://thehistoryofhowweplay.wordpress.com/2017/06/16/who-created-periscope/ Who Created Periscope?]}}
 +
 
 +
The Sega version was one of the first arcade game projects to be started by the newly formed Sega Enterprises (following the merger of [[Rosen Enterprises]] and [[Service Games]]) and was engineered by [[Hisashi Suzuki]] in the same year. It was not released in Japan until 1966, however.{{ref|[Steven L. Kent (2000), ''The First Quarter: A 25-Year History of Video Games'', p. 83, BWD Press, ISBN 0-9704755-0-0]}}
 +
 
 +
Like Namco's version, Sega's ''Periscope'' was originally only available as a three-player game, with a single player variant entering production in early 1968.{{magref|cb|1968-03-16|187}}{{magref|cb|1969-07-xx|337}}{{magref|bb|1968-09-21|53}}{{magref|bb|1968-09-21|57}} Sega's version was exported overseas to the Western world, whereas Namco's version was only released in Japan.
 +
 
 +
Sega developed the "Model NP-3D" system to produce the "unique combination of electricity, light and sound" for the game.{{magref|cb|1967-04-15|73}}
 +
 
 +
===Impact===
 +
''Periscope'' was an early submarine simulator and light gun shooter,{{ref|[Brian Ashcraft (2008) ''Arcade Mania! The Turbo Charged World of Japan's Game Centers'', p. 133, Kodansha International]}} which used lights and plastic waves to simulate sinking ships from a submarine.{{ref|[Steve L. Kent (2001), ''The ultimate history of video games: from Pong to Pokémon and beyond: the story behind the craze that touched our lives and changed the world'', p. 102, Prima, ISBN 0-7615-3643-4]}} It was the first electro-mechanical arcade game to incorporate special effects and electronic sound.{{magref|gamemachinejp|225|17}} The three-player version was also the first co-op game.{{fileref|Periscope EM US Flyer 2.pdf}} It became an instant success in Japan, Europe, and North America.{{ref|1=[https://books.google.com/books?id=XiM0ntMybNwC Mark J. P. Wolf (2008), ''The video game explosion: a history from PONG to PlayStation and beyond'', p. 149, ABC-CLIO, ISBN 0-313-33868-X]}} It was the first arcade game to cost 30 yen per play in Japan,{{ref|[https://archive.org/details/ultimatehistoryofvideogamesrevisited/page/n355/mode/2up Steve L. Kent (2001), ''The Ultimate History of Video Games Revisited'', p. 102, Prima, ISBN 0-7615-3643-4]}} and a [[wikipedia:Quarter (United States coin)|quarter]] per play in the United States,{{ref|[https://archive.org/details/ultimatehistoryofvideogamesrevisited/page/n355/mode/2up Steven L. Kent (2000), ''The First Quarter: A 25-Year History of Video Games'', pp. 340-1, BWD Press, ISBN 0-9704755-0-0]}} where it would remain the standard price in arcades for many years to come.{{ref|1=[https://books.google.com/books?id=XiM0ntMybNwC Mark J. P. Wolf (2008), ''The video game explosion: a history from PONG to PlayStation and beyond'', p. 149, ABC-CLIO, ISBN 0-313-33868-X]}} By 1967, Sega had sold 5,000 arcade units.{{ref|https://videogamehistorian.wordpress.com/2015/06/08/historical-interlude-the-history-of-coin-op-part-6-a-technological-revolution/}}
 +
 
 +
''Periscope'' was the biggest hit in the history of the American arcade industry up until 1969.{{magref|cb|1969-01-04|36}} It was reportedly the most profitable arcade game of the 1960s.{{magref|cb|1969-03-29|65}} ''Periscope'' revived the North American arcade industry in the late 1960s.{{fileref|NextGeneration US 24.pdf|page=11}} It popularized a new genre of "see-hear-do" arcade games,{{ref|[https://archive.org/details/canadian-coin-box-magazine-1974-04/page/18 ''Canadian Coin Box'' (April 1974), page 18]}} where an audio-visual experience is simulated behind a screen, making it a precursor to early arcade video games.
 +
 
 +
In North America, the game was cloned by [[Midway]] as ''Sea Raider'' (1969) and ''Sea Devil'' (1970). Midway later adapted it into an arcade video game, ''[[wikipedia:Sea Wolf (video game)|Sea Wolf]]'' (1976).{{ref|https://web.archive.org/web/20201013021726/http://www.pinrepair.com/arcade/sperisc.htm}} In the United Kingdom, the game was cloned in 1967 by Mayfield Electronics as ''Submarine Patrol'' and by Nixsales as ''Action Stations''.{{ref|[https://thehistoryofhowweplay.wordpress.com/2017/06/16/who-created-periscope/ Who Created Periscope?]}}
 +
 
 +
''Periscope'' revolutionized the arcade industry. It created a new genre of "specialty games" or "novelty games" which emphasized special effects. According to ''Cash Box'' magazine in 1969:{{magref|cb|1969-11-29|69}}{{fileref|CashBox US 1969-11-29.pdf|page=69}}
 +
 
 +
{{quote|Five years ago, most of these items would have been termed "far out" ... with their mad sound effects, crazy lights, and altogether unorthodox play features like shooting down a jet bomber with a visible beam of light, or crashing into a racing car so hard, you feel the jar in your hands.}}
 +
 
 +
According to ''Replay'' magazine editor Eddie Adlum:{{ref|[https://archive.org/details/ultimatehistoryofvideogamesrevisited/page/n355/mode/2up Steve L. Kent (2001), ''The Ultimate History of Video Games Revisited'', pp. 340-1]}}
  
The Sega version was engineered by [[Hisashi Suzuki]], like most Sega electro-mechanical games at the time. It was one of the first arcade game projects to be started by the newly formed Sega Enterprises following the merger of [[Rosen Enterprises]] and [[Service Games]] in 1965.
+
{{quote|Sega made its mark in this country when it brought over a gigantic target rifle called Periscope. What was interesting about Periscope was not only that it was the biggest machine ever built—I think the thing ran io feet deep by 6 feet wide by 6 feet high—it introduced quarter-play. It was so successful in the arcades that it brought people off the street. People came into these arcades just to play that game. I would say that in my time, Periscope is one of the great successful novelty machines.}}
  
The Sega version was single-player, compared to Namco's original three-player version. Sega's version was exported overseas to the Western world, whereas Namco's version was only released in Japan.
+
This paved the way for the emergence of arcade video games several years later, with arcade video games initially marketed as "novelty games" in the early 1970s.
  
 
===Legacy===
 
===Legacy===
 
A three-player version was advertised by Sega, taking the form of a large installation with three separate periscopes. This variant is exceedingly rare - only one is definitely known to have existed, being a setup used for the [[14th Hotel Equipment Exhibition]] (where it stood at the [[Socodimex]] booth) in late 1967. Reportedly it was very popular, taking in 500 francs a day.
 
A three-player version was advertised by Sega, taking the form of a large installation with three separate periscopes. This variant is exceedingly rare - only one is definitely known to have existed, being a setup used for the [[14th Hotel Equipment Exhibition]] (where it stood at the [[Socodimex]] booth) in late 1967. Reportedly it was very popular, taking in 500 francs a day.
 +
 +
''[[Missile]]'' (1969) could be considered a spiritual successor, as it involves similar gameplay. Sega later released several submarine arcade video games that could be considered spiritual successors to ''Periscope'', including ''[[Depthcharge]]'' (1977), ''[[Deep Scan]]'' (1980) and ''[[SubRoc-3D]]'' (1982).
  
 
''[[Sega Ages 2500 Series Vol. 26: Dynamite Deka]]'' replaces the ''[[Deep Scan]]'' mini-game in the original ''[[Dynamite Deka]]'' with a simulation of ''Periscope''.
 
''[[Sega Ages 2500 Series Vol. 26: Dynamite Deka]]'' replaces the ''[[Deep Scan]]'' mini-game in the original ''[[Dynamite Deka]]'' with a simulation of ''Periscope''.
  
==Specifications==
+
==Production credits==
:'''Height''': 72"
+
{{creditstable|
:'''Width''': 48"
+
*[[Shikanosuke Ochi]]
:'''Depth''': 96"
+
| source=Patents{{ref|https://web.archive.org/web/20220306202546/https://patents.google.com/patent/US3326223A/}}
 +
| console=EM
 +
}}
  
==Gallery==
+
==Magazine articles==
<gallery>
+
{{mainArticle|{{PAGENAME}}/Magazine articles}}
File:Periscope_machine2.jpg|Game backboard
 
</gallery>
 
  
 
==Promotional material==
 
==Promotional material==
 +
{{gallery
 +
|{{gitem|Periscope EM JP promo.png|Promotional photo{{ref|https://web.archive.org/web/20230206222049/http://allincolorforaquarter.blogspot.com/2015/06/the-early-history-of-sega-what-was.html}}}}
 +
|{{gitem|Periscope_flyer1.jpg|Flyer}}
 +
|{{gitem|Periscope EM US Flyer 2.pdf|Flyer 2}}
 +
|{{gitem|Periscope EM UK flyer.pdf|UK flyer}}
 +
|{{galleryPrintAd|cb|1968-03-23|97}}
 +
|{{galleryPrintAd|cb|1968-12-28|54}}
 +
|{{galleryPrintAd|cb|1968-12-28|54}}
 +
}}
 +
 +
==Photo gallery==
 
<gallery>
 
<gallery>
File:Periscope_flyer1.jpg|Flyer
+
Periscope_machine1.jpg
Periscope EM US Flyer 2.pdf|Flyer 2
+
Periscope_machine2.jpg|Game backboard
 
</gallery>
 
</gallery>
 +
 +
==External links==
 +
*[https://www.youtube.com/watch?v=7FaeuJk9WFg Footage of an exhibition of amusement equipment at the Royal Lancaster Hotel in London in 1968 showing ''Periscope'' running]
 +
*[https://www.yomogi2017.xyz/entry/2019/08/28/224840 ペリスコープ(ナムコ)/バスケットボール(タイトー)実機画像]
  
 
==References==
 
==References==
 
<references/>
 
<references/>
 
[[Category:1966 electro-mechanical arcade games]]
 
[[Category:Electro-mechanical arcade games]]
 

Latest revision as of 12:02, 5 December 2024

n/a

Periscope logo.png
Periscope cabinet.jpg
Periscope
System(s): Electro-mechanical arcade
Publisher: Sega Enterprises, Ltd.
Developer:
Distributor: Phonographic Equipment (UK)[1]
Genre: Shooting[2]

















Number of players: 1-3
Release Date RRP Code
Arcade (Electro-Mechanical)
JP
¥? ?
Arcade (Electro-Mechanical)
US
$1,495[5] ?
Arcade (Electro-Mechanical)
EU
€? ?
Arcade (Electro-Mechanical)
UK
£? ?
Arcade (Electro-Mechanical)
FR
?F ?




































This short article is in need of work. You can help Sega Retro by adding to it.


Periscope (ペリスコープ) is a 1966 electro-mechanical arcade submarines shooting game, with the player looking through a periscope to shoot ships, manufactured by Sega Enterprises, Ltd.[2] Interior scenery inside the machine is lit up with a blacklight tube.

The game is an adaptation of an earlier Namco arcade game, also called Periscope, released in 1965. It was the first electro-mechanical arcade game to incorporate special effects and electronic sound, introducing a new genre of arcade games simulating an audio-visual experience behind a screen. Sega's version was a major milestone in the history of arcade games. It revived the North American arcade industry in the late 1960s, laying the foundation for the arrival of arcade video games in the early 1970s.

Gameplay

As the game starts boats start cruising by across the back of the scenery, and the front glass lights up "torpedoes ready to fire". Look through the periscope and aim in front of the ship, then press the fire button on the right handle. An electronic "whoosh" sounds is made as the torpedo heads towards the boat. There are a series of ten torpedo shaped lights on the playfield that make the torpedo look like it's moving towards the ship (light animation). If the boat is hit the scenery flashes a 120 volt red light from each side and an explosion is heard.

There is an electronic sound board that makes the sonor "beep" and the torpedo "woosh" sounds, and an amplifer circuit for these sounds. The explosion sound however is a mechanical sounds. It's made by pulling in a relay attached to a spring, with a magnet (to make the sound more robust) near a transducer. The spring vibrates and is read thru this phonograph needle/transducer device, like an old guitar reverb unit. A 500 mfd cap is added to the explosion relay to hold the relay in for about 2 seconds giving a longer explosion sound (if the explosion sound is too short, this cap is probably dead). This mechanical set up gives a nice explosion. The power supply for the sonar/woosh sound boards is unregulated 18 volt DC and comes from 12 volt AC to a single diode and capacitor. Adding capacitance can reduced sound hum, but will not eliminate is. It's just 1/2 wave DC regulation (not full wave like a bridge rectifier would provide), so there will always be a bit of hum.

The machine tracks how many torpedoes have been fired and how much tonnage has been sunk. The goal is to sink as many boats as you can using your torpedoes. The game gives you ten torpedoes per play with bonus torpedoes awarded for a perfect score. The boats also may change direction at any time for more challenge. There are also two windows in the front top glass that allow other people to watch the action as you play. Scoring is done with light box scoring (no score reels).

Specifications

Dimensions

Three-player cabinet

3.962 m (156")
2.134 m (84")
2.743 m (108")


Single cabinet

1.219 m (48")
1.829 m (72")
2.438 m (96")


History

Development

Periscope was originally a three-player machine manufactured by Namco in 1965, and was designed by its founder Masaya Nakamura.[12][13] The game was inspired by a Japanese manga series, Submarine 707 (1963–1965).[14]

The Sega version was one of the first arcade game projects to be started by the newly formed Sega Enterprises (following the merger of Rosen Enterprises and Service Games) and was engineered by Hisashi Suzuki in the same year. It was not released in Japan until 1966, however.[15]

Like Namco's version, Sega's Periscope was originally only available as a three-player game, with a single player variant entering production in early 1968.[16][17][18][19] Sega's version was exported overseas to the Western world, whereas Namco's version was only released in Japan.

Sega developed the "Model NP-3D" system to produce the "unique combination of electricity, light and sound" for the game.[20]

Impact

Periscope was an early submarine simulator and light gun shooter,[21] which used lights and plastic waves to simulate sinking ships from a submarine.[22] It was the first electro-mechanical arcade game to incorporate special effects and electronic sound.[23] The three-player version was also the first co-op game.[24] It became an instant success in Japan, Europe, and North America.[25] It was the first arcade game to cost 30 yen per play in Japan,[26] and a quarter per play in the United States,[27] where it would remain the standard price in arcades for many years to come.[25] By 1967, Sega had sold 5,000 arcade units.[28]

Periscope was the biggest hit in the history of the American arcade industry up until 1969.[29] It was reportedly the most profitable arcade game of the 1960s.[30] Periscope revived the North American arcade industry in the late 1960s.[31] It popularized a new genre of "see-hear-do" arcade games,[32] where an audio-visual experience is simulated behind a screen, making it a precursor to early arcade video games.

In North America, the game was cloned by Midway as Sea Raider (1969) and Sea Devil (1970). Midway later adapted it into an arcade video game, Sea Wolf (1976).[33] In the United Kingdom, the game was cloned in 1967 by Mayfield Electronics as Submarine Patrol and by Nixsales as Action Stations.[14]

Periscope revolutionized the arcade industry. It created a new genre of "specialty games" or "novelty games" which emphasized special effects. According to Cash Box magazine in 1969:[34][35]


Five years ago, most of these items would have been termed "far out" ... with their mad sound effects, crazy lights, and altogether unorthodox play features like shooting down a jet bomber with a visible beam of light, or crashing into a racing car so hard, you feel the jar in your hands.


According to Replay magazine editor Eddie Adlum:[36]


Sega made its mark in this country when it brought over a gigantic target rifle called Periscope. What was interesting about Periscope was not only that it was the biggest machine ever built—I think the thing ran io feet deep by 6 feet wide by 6 feet high—it introduced quarter-play. It was so successful in the arcades that it brought people off the street. People came into these arcades just to play that game. I would say that in my time, Periscope is one of the great successful novelty machines.


This paved the way for the emergence of arcade video games several years later, with arcade video games initially marketed as "novelty games" in the early 1970s.

Legacy

A three-player version was advertised by Sega, taking the form of a large installation with three separate periscopes. This variant is exceedingly rare - only one is definitely known to have existed, being a setup used for the 14th Hotel Equipment Exhibition (where it stood at the Socodimex booth) in late 1967. Reportedly it was very popular, taking in 500 francs a day.

Missile (1969) could be considered a spiritual successor, as it involves similar gameplay. Sega later released several submarine arcade video games that could be considered spiritual successors to Periscope, including Depthcharge (1977), Deep Scan (1980) and SubRoc-3D (1982).

Sega Ages 2500 Series Vol. 26: Dynamite Deka replaces the Deep Scan mini-game in the original Dynamite Deka with a simulation of Periscope.

Production credits

Source:
Patents[37]


Magazine articles

Main article: Periscope/Magazine articles.

Promotional material

Periscope EM JP promo.png
Promotional photo[38]
Periscope EM JP promo.png
Periscope flyer1.jpg
Flyer
Periscope flyer1.jpg

Periscope EM US Flyer 2.pdf

PDF
Flyer 2
Periscope EM US Flyer 2.pdf
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PDF
UK flyer
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Logo-pdf.svg
Print advert in Cash Box (US) #1968-03-23: "March 23, 1968" (1968-03-23)
Logo-pdf.svg
Logo-pdf.svg
Print advert in Cash Box (US) #1968-12-28: "December 28, 1968" (1968-12-28)
Logo-pdf.svg
Logo-pdf.svg
Print advert in Cash Box (US) #1968-12-28: "December 28, 1968" (1968-12-28)
Logo-pdf.svg

Photo gallery

External links

References

  1. File:Periscope EM UK flyer.pdf, page 3
  2. 2.0 2.1 https://www.sega.jp/history/arcade/product/11561
  3. Service Games: The Rise and Fall of SEGA (page 6)
  4. https://books.google.co.uk/books/content?id=DbFxAgAAQBAJ&hl=pt-PT&pg=PA6&img=1&zoom=3&sig=ACfU3U3dcZLsxPnbSYJZoZEE_X_yFK2MeA&w=1280 (archive.today)
  5. File:CashBox US 1972-02-19.pdf, page 47
  6. Cash Box, "August 18, 1973" (US; 1973-08-18), page 50
  7. File:CashBox US 1973-08-18.pdf, page 54
  8. 8.0 8.1 Cash Box, "December 17, 1966" (US; 1966-12-17), page 65/66 (65)
  9. Billboard, "November 25, 1967" (US; 1967-11-25), page 77
  10. File:Periscope EM US Flyer 2.pdf, page 3
  11. File:Periscope flyer1.jpg
  12. @onionsoftware on Twitter (Wayback Machine: 2017-04-18 04:11)
  13. Elemecha, Namco
  14. 14.0 14.1 Who Created Periscope?
  15. [Steven L. Kent (2000), The First Quarter: A 25-Year History of Video Games, p. 83, BWD Press, ISBN 0-9704755-0-0]
  16. Cash Box, "March 16, 1968" (US; 1968-03-16), page 187
  17. Cash Box, "July 1969" (US; 1969-07-xx), page 337
  18. Billboard, "September 21, 1968" (US; 1968-09-21), page 53
  19. Billboard, "September 21, 1968" (US; 1968-09-21), page 57
  20. Cash Box, "April 15, 1967" (US; 1967-04-15), page 73
  21. [Brian Ashcraft (2008) Arcade Mania! The Turbo Charged World of Japan's Game Centers, p. 133, Kodansha International]
  22. [Steve L. Kent (2001), The ultimate history of video games: from Pong to Pokémon and beyond: the story behind the craze that touched our lives and changed the world, p. 102, Prima, ISBN 0-7615-3643-4]
  23. Game Machine, "1983-12-01" (JP; 1983-12-01), page 17
  24. File:Periscope EM US Flyer 2.pdf
  25. 25.0 25.1 Mark J. P. Wolf (2008), The video game explosion: a history from PONG to PlayStation and beyond, p. 149, ABC-CLIO, ISBN 0-313-33868-X
  26. Steve L. Kent (2001), The Ultimate History of Video Games Revisited, p. 102, Prima, ISBN 0-7615-3643-4
  27. Steven L. Kent (2000), The First Quarter: A 25-Year History of Video Games, pp. 340-1, BWD Press, ISBN 0-9704755-0-0
  28. https://videogamehistorian.wordpress.com/2015/06/08/historical-interlude-the-history-of-coin-op-part-6-a-technological-revolution/
  29. Cash Box, "January 4, 1969" (US; 1969-01-04), page 36
  30. Cash Box, "March 29, 1969" (US; 1969-03-29), page 65
  31. File:NextGeneration US 24.pdf, page 11
  32. Canadian Coin Box (April 1974), page 18
  33. http://www.pinrepair.com/arcade/sperisc.htm (Wayback Machine: 2020-10-13 02:17)
  34. Cash Box, "November 29, 1969" (US; 1969-11-29), page 69
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