“If I have seen a little further, it is by standing on the shoulders of giants.” – Isaac Newton

“Imitation is the sincerest form of flattery.” – Charles Caleb Colton

“Art is theft.” – Pablo Picasso

Diagram of connections between games

The pioneering days of video games saw a tremendous amount of innovation, but also a lot of unabashed appropriation. Designers were under pressure to develop novel experiences with unfamiliar technology in a new medium, and they often bet conservatively by tweaking a successful design rather than creating out of whole cloth.

From the first video game in 1962, there is a clear path of derivation to the Cambrian explosion of 1979, a rapid era of progress in video game design that created the modern arcade classics we know and love. These are some of the platforms I describe in my book Making 8-bit Arcade Games in C.

The Bronze Age Begins

“The game of Spacewar blossoms spontaneously wherever there is a graphics display connected to a computer.” – Alan Kay

Video games were invented in academia, but refined in industry. The first inventions generally recognized as video games were Tennis for Two, developed by William Higinbotham at Brookhaven National Laboratory in 1958, and Spacewar! by Steve Russell and others at MIT in 1962.

Spacewar! was a big hit on campus, and a few students hit upon the idea of recreating the game with less expensive hardware than a PDP-1 and its dot-drawing Type 30 CRT.

Spacewar! -- https://commons.wikimedia.org/w/index.php?curid=2060215

In 1971, Bill Pitts and Hugh Tuck developed a coin-operated version called Galaxy Game. Powered by a single PDP-11, the final version could play games on four monitors simultaneously. Despite its popularity at the Stanford student union, it never made back the $65,000 development cost, and did not progress beyond the prototype stage.

Galaxy Game -- https://commons.wikimedia.org/w/index.php?curid=3843479

While Pitts and Tuck were focused on gameplay, Nolan Bushnell and Ted Dabney had been trying to reduce the cost enough to manufacture. They decided to make their own hardware which was powerful enough to run a single monitor, and partnered with Bill Nutting to manufacture it as Computer Space.

Computer Space -- https://commons.wikimedia.org/w/index.php?curid=48168745

Ralph Baer, Atari and PONG

“The fact is that I absolutely did see the Odyssey game and I didn’t think it was very clever.” – Nolan Bushnell

Soon afterwards, the Magnavox Odyssey was released with a ping-pong game developed by Ralph Baer. Bushnell had played it previously, and in 1972 released a similar game under the newly-formed Atari label called PONG.

This did not go unnoticed by Magnavox, who eventually forced Atari into a licensing deal, of which Atari got the better end. (Despite the efforts of an expensive crew of attorneys, Higinbotham’s Tennis for Two was not recognized as prior art for Baer’s invention, and there’s no evidence he’d seen it previously.)

Magnavox Atari PONG

PONG was an immediate sensation, unlike Computer Space whose complex controls were more popular with college students than the general public. It was quickly imitated by several manufacturers, including Bushnell’s former partner Bill Nutting.

Several years later, Atari released Breakout, a brick-busting game which was perhaps inspired by another PONG-lookalike (Clean Sweep by RamTek).

Atari Breakout RamTek Clean Sweep

Steve Wozniak worked on a design for Breakout that would never be used. But the experience working on the game inspired him to add color graphics, paddles, and sound to the Apple II computer design. The system diskette included a game called Little Brick Out written in his own BASIC interpreter, originally called “Game BASIC”.

“I knew that I had a machine with a microprocessor that could do a million things a second, move those bits around on the screen and make things move and play games and all. I thought, I wonder, with my slow BASIC, can I write a game that’s playable? Breakout. I’d done Breakout for Atari. I knew Breakout.” – Steve Wozniak

Little Brick Out

Gremlin Industries

Gremlin's Blockade Tron Arcade Game

Later known as Sega/Gremlin and then just Sega, this amusement company started making video games in 1976. Their first game Blockade was a big hit, inspiring many clones, and years later, the light cycle sequence in the movie Tron. But the flattery was not well received.

“We introduced Blockade at the AMOA show in Chicago. I watched every video game company president drag one of his engineers into our booth, point at Blockade, and say, ‘that one.’ By the time we figured out how to manufacture a video game we were last to market with our own game.” – Lane Hauck

They were one of the first game manufacturers to use a CPU – the Intel 8080 – and one of the first to use RGB color monitors. Their “VIC Dual” system was reused for several different games.

Space Invaders

“I was determined to come up with something that was even better than Breakout. My take was that the appeal was due to the sense of accomplishment and exhilaration involved in destroying a set number of targets and then moving on to a new level. I felt I could improve upon this by giving the targets a more interesting shape and turning it into a shooting game.” – Tomohiro Nishikado

“It was basically Breakout with moving bricks and a gun, instead of a ball and paddle.” – Lyle Rains

Meanwhile in Japan, a young engineer named Tomohiro Nishikado had developed a Pong clone Elepong for Taito Corporation. He had seen Atari’s Breakout, and its “level clearing” gameplay inspired the descending wall of aliens in his 1978 game Space Invaders.

Taito's Space Invaders

The hardware for Space Invaders is more-or-less compatible with Midway’s Gun Fight – a game which Nishikado designed but was adapted for the Intel 8080 CPU by Dave Nutting (Bill Nutting’s brother). This hardware had been used for previous monochrome Midway games.

In addition, the Space Invaders code contains a sprite drawing routine also found in Gun Fight. Since the 8080 didn’t have a barrel shifter, this routine uses the onboard Fujitsu MB14241 chip to shift the sprite’s bytes by arbitary amounts before writing them to the frame buffer:

    3753  1410  AF                 XOR     A
    3754  1411  D3 04              OUT     (04h),A
    3755  1413  DB 03              IN      A,(03h)
    3756  1415  B6                 OR      (HL)
    3757  1416  77                 LD      (HL),A
    3758  1417  E1                 POP     HL
    3759  1418  01 20 00           LD      BC,0020h
    3760  141B  09                 ADD     HL,BC
    3761  141C  C1                 POP     BC
    3762  141D  05                 DEC     B

Asteroids and Vector Graphics

“I’d played four-player Spacewar back in the early-Seventies on a PDP machine in the Stanford Research Lab. Down on campus in the Stanford Forum, they had two machines linked up and you could play for a quarter. Was I any good? Oh no!” – Ed Logg

Vector graphics didn’t start with Atari, but with an MIT student named Larry Rosenthal. He had also seen Spacewar! at Stanford, and recreated it with a homemade CPU and a vector display adapted from a black-and-white TV.

Cinematronics purchased the technology and released the game as Space Wars in 1978. (Star Trek fans may recognize that the rightmost player’s ship looks suspiciously like the USS Enterprise.)

Cinematronics Space Wars, https://en.wikipedia.org/w/index.php?curid=2507796

Atari developed its own vector technology, but was still looking for a new game concept, having already done Computer Space. They released Lunar Lander in 1979, but the game’s concept was seeded ten years prior.

LUNAR was a text-based simulation written in an early interpreted language called FOCAL, written by a high-school student named Jim Storer. A DEC employee named David Ahl later converted it into BASIC, later including it in his very popular 101 BASIC Computer Games books. In 1973, DEC contractor Jack Burness created a graphical version to promote its GT40 vector graphics terminal. This is likely the version that inspired Atari’s game. (For more detail, see Benj Edward’s excellent article Forty Years of Lunar Lander.)

Atari's Lunar Lander, https://en.wikipedia.org/w/index.php?curid=998667

Atari’s next vector game, Asteroids, would be inspired by multiple games. Lyle Rains combined the two-dimensional approach of Computer Space with the eliminate-all-enemies gameplay of Space Invaders. Ed Logg used Spacewar’s basic control scheme for the ship, including the hyperspace button.

Atari's Asteroids, https://en.wikipedia.org/w/index.php?curid=509796

Arcade operators eventually grew tired of the fussy and expensive vector monitors, and no new vector games were produced after 1985. But these classic games inspired countless others.

Galaxian

“We were actually in the middle of developing Galaxian when Space Invaders came out, and the President of Namco told us, in no uncertain terms, that Galaxian had to be the ‘post-Invaders’ game. It was a tremendous amount of pressure. Naturally, we took a lot of cues from Space Invaders while making Galaxian.” – Kazunori Sawano, Planner/Designer

The marching columns of aliens in Namco’s Galaxian were undeniably influenced by Space Invaders. Designer Kazunori Sawano also cites the recently-released Star Wars movie as having a “huge impact” on the team.

Galaxian would also spawn many imitators, but its lasting contribution is its hardware design, which pushed the limit of video game designs in 1979. At its core is a Z80 CPU at 3.072 MHz. The graphics system featured RGB graphics and multicolor hardware sprites overlapping a 28x32 tiled background. (At the time, the term “sprite” had not yet been coined, so designers called them “stamps.”)

Namco's Galaxian Namco's King and Balloon

The designers would reuse the same PCB (printed circuit board) for King & Balloon. Other companies like Konami licensed the video hardware to make games like Scramble and Frogger.

Scramble Frogger

The same basic tiles-and-sprites system would be used for many other titles – Pac-Man, Dig Dug, Xevious, etc.

Williams

“We realised Asteroids without the vectors and spinning thing was just a bad version of Asteroids” – Eugene Jarvis, Defender

Defender evolved from experimental riffs on Space Invaders and Asteroids, finally finding its feet when someone remarked that the best part of Asteroids was flying past the edges of the screen, and what if the game universe was larger than a single screen? This led to Defender’s scrolling planetary surface.

Defender Robotron

Williams’ games featured a 36 KB video frame buffer – in 1980, that was a lot. A pair of “special chips” acted as a primitive 2D GPU, quickly blitting sprites to the frame buffer.

The Post-Invaders Era

After Pac-Man fever had replaced Space Invaders, arcade game designers looked beyond the shoot-em-up for inspiration. Yet games like Galaga, Tempest, and Gyruss breathed new life into the old fire-button formula. Arkanoid juiced up the old Breakout gameplay, while Atari attempted to rasterize their classic rock-busting game with Blasteroids.

Hardware designers were busy too, adding more colors and resolution, hardware sprite scaling, speech and FM audio synthesis. But the gaming platforms of the late 1970s would inspire a generation of programmers and designers.

In my new book Making 8-bit Arcade Games in C, I describe five of these unique platforms (VIC Dual, Midway 8080, Galaxian/Scramble, Atari Vector, and Williams), and how to program them in C using the 8bitworkshop IDE.