Thursday, October 22, 2015

Preliminary Report - Was The Devil's Dungeon the First Commercial CPRG and What Was the First Commercial Microcomputer Game?

While arcade games are the focus of my research, I occasionally delve into computer game history. While I certainly played my share of arcade games and spent a good deal of time with my Atari 2600 (though my first console was an Atari/Sears Super Pong IV), my favorite gaming platform by far was my Apple II and probably my favorite genre of games was the role playing game. I have also always had an intense interest in the origin of things (my favorite comic book issues, for instance, were inevitably those with origin stories). Unsurprisingly, then, one topic in which I am keenly interested in is that of the first commercial microcomputer/personal computer role playing game as well as the first commercial microcomputer game in general.

The "commercial" qualifier is a necessity since the finding the first microcomputer game period is probably a fool's errand. With computer games users could program their own games and many of them did. In the early years of personal computing, in fact, this may have been the only way to obtain software since there was as of yet no real commercial microcomputer software industry - at least not for games. But more on that later. Developing arcade and console games generally required expensive hardware and development systems that only a tiny, tiny handful of consumers were likely to have. Microcomputers were different. Almost all of them eventually had at least a BASIC compiler available and many of them shipped with one out of the box. In addition, there were numerous books and magazines offering "type-in" games in BASIC so even users completely lacking in programming skills could have a go at it. Since such games could be created by anyone and everyone who owned a computer, trying to document the first such game would probably be an exercise in futility.

Trying to find the first commercially sold personal computer game is a bit more manageable. But it still offers its own set of challenges. One is defining what counts as a personal computer. Contrary to what some thing, personal computers did not start with the Apple II, Commodore PET, and TRS-80 in 1977. There were at least two dozen personal computers, and possibly many more, produced in 1975, 1976, and the first half of 1977 (i.e. before the West Coast Computer Faire in June when the members of the "trinity" were either announced or introduced). And they didn't start with the Altair 8800 either. A handful of models appeared in the years before the Altair was introduced in the famous January 1975 Popular Electronics cover story, including the Kenbak-1, the Datapoint 2200, the National Radio Institute 832, a kit computer that could be built from 52 integrated circuits, the French MICRAL-N (1973, considered the first microprocessor-based nonkit microcomputer to be sold commercially), and the Scelbi 8H (1974, the first US microcomputer with a microprocessor). In the 1960s there were machines that some consider to be personal computers, MIT/DEC's LINC (1962), and Olivetti's Programma 101, introduced at the 1964 New York World's Fair. Some trace the beginnings of personal computing to 1966 when Stephen Gray formed the Amateur Computer Society as a way for hobbyists building their own computers to share information. Of course, in order for a society to be formed, there had to be an existing personal computer movement. Nonetheless, it was in the mid-1970s that the personal computer industry really began to take off. At the time, these machines were generally called "microcomputers" rather than "personal computers," which might be a better term to use.

All of that is a long way of saying that even the question of the first commercial microcomputer game is not an easy one to answer. This is especially true given how poorly this era is documented and how little attention it has been given by computer game historians. One thing I have discovered in researching early arcade games is that sources like Wikipedia and MobyGames are, more often than not, worthless. They are somewhat useful for finding information on arcade games published from the late '70s on but for earlier games, if you want to find reliable information, you have to dig it up yourself. The situation for early computer games is even worse. In my opinion, no one has really researched the pre-1978, or even the pre-1980 era in sufficient detail.

I would love to tell you that I am going to be the person who does but that is not the case. At one point, I was planning to write separate books covering the history of arcade, computer, and console games but just covering arcade games, and even then just up to 1985, and even covering primarily games made in America has taken up far too much of my time. On occasion, however, I do tackle more bite-sized questions about computer games.

Two that I hope to address one day are: 1) what was the first commercial CPRG (computer role-playing game), and 2) what was the first commercial microcomputer game. I will not be attempting to answer either of those questions here, since I haven't really researched them. I have, however, uncovered a few interesting items in my preliminary research and thought I'd share them.

The first question is the easier of the two because we are dealing with some constraints. The first edition of Dungeons and Dragons came out in 1974 making it very unlikely that there was a computer RPG before then. Perhaps the first computer RPGs of any kind were those created for the PLATO system. PLATO (Programmed Logic for Automated Teaching Operations) was a CAI (Computer Assisted Instruction) system created in 1960 at the University of Illinois, originally on the ILIAC I computer. Initially a single-user system, it soon evolved into a timeshare system that allowed multiple users to connect to a single mainframe. By the late 1970s the system included several thousand terminals around the world connected to almost a dozen mainframes. PLATO was a fascinating system which merits far more attention than it has been given so far and far more than I am going to give it here.

An entire blog could be dedicated just to PLATO (a book is forthcoming that looks very promising). It was among the first systems to offer such features as e-mail, chat rooms, and instant messaging. It was also home to a number of games, including some of the first CRPGs. The first may have been m199H, which was allegedly written in 1974. Unfortunately, nothing is known of the game save its name. A number of other RPGs appeared on the system in 1975, including dnd/The Game of Dungeons (which may have been started in 1974), pedit5/The Dungeon, and Moria. From the screenshots and videos, I've seen, these games appear to be more sophisticated than the microcomputer games we will discuss shortly. They arguably included features such as high score boards and bosses (one developer claims that one of these games included the first boss, but I find that claim questionable). I do not have time to go into these games here, but you can check out Charles Bolingbroke's (a pseudonym) excellent CPRG Addict blog for more info.

What about the first commercial microcomputer RPG? Here, three excellent sources come to mind: the CPRG Addict blog, the Museum of Computer Adventure Game History (, and Matt Barton's book Dungeons and Desktops. The leading contenders are Beneath Apple Manor (Don Worth, The Software Factory/Quality Software), Space (Steven Pederson and Sherwin Steffen, Edu-Ware), Dungeon Campaign (Robert Clardy, Synergistic), Dunjonquest: Temple of Apshai (Automated Simulations), Telengard (Avalon Hill), Wizard's Castle (Joseph R. Power), Eamon (Donald Brown), and Akalabeth (Richard Garriott).

Of these, Beneath Apple Manor, released in 1978, is the consensus pick for first CPRG. Wikipedia and CPRG Addict both list it as such, as does David Craddock's book Dungeon Hacks (a history of Roguelike RPGs) Craddock, however, takes the claim from CPRG Addict. Seeking "definitive proof" of the claim, Craddock contacted Chester Bolingbroke, who replied:

"In all my investigations, I've been unable to track down a commercial RPG released earlier than 1978. MobyGames, one of the most comprehensive sources on the Internet, gives 1978 as the first year of any commercial RPG, as does Wikipedia. In almost five years of blogging, no one has come forward with an earlier title."

That certainly doesn't sound like definitive proof to me and , as we will discuss, I am a bit skeptical of the claim.

Let's quickly review the major candidates.

* Akalabeth and Temple of Apshai were not published until 1979 (for a discussion of Akalabeth's chronology, see (

* Eamon was a text adventure system with some rudimentary role playing elements thrown in. The system eventually included over 200 games. While one person claims to have played it in 1978, a 1979 or 1980 initial release date seems more likely. Once again, Jimmy Maher has done some excellent legwork on this one (

* Telengard's release date is usually listed as 1982, but its history goes back much farther. The author, Daniel Lawrence, had written a BASIC game called DND (a different game than the PLATO dnd) in 1976 or 1977 and ported it to a Commodore PET in 1978. As Lawrence explained in an interview for the Armchair Arcade website (
"DND was written in 1976. Telengard was written and played locally by myself and the local crowd in 1978 when the first Commodore PETs came out. I had ported it to the Atari 800, the Apple ][+ and the TRS-80 before it was noticed by Avalon Hill and licensed for marketing."
This seems to indicate that the game was merely played by Lawrence and his friends in 1978, not commercially released.

* In a comment on CPRG Addict Robert Clardy claimed that Dungeon Campaign was published in December 1978. However, the copyright record lists a date of creation of 1979 and a copyright date of March 20, 1979.

* Space was a text-based sci-fi game based on the Traveler tabletop rpg. While some list it as a 1978 game, Barton claims it was likely released in 1979.

* Wizard's Castle was another game mentioned by Barton. It was a BASIC game published in a
magazine for the Exidy Sorcerer. Barton does not say which magazine, but I suspect it was the Sorcerer fanzine whose name escapes me. Baron also fails to mention when the game was published. The Sorcerer debuted in April 1978 and I find it unlikely that the game was published prior to 1979 but need to do more digging.

Finally, there seems to be little question that Beneath Apple Manor was published in 1978, but when? Worth claims that he showed the game off in computer stores in the fall of 1978, but this is a bit problematic. Even if his memory is accurate, it is unclear if he sold the game in the fall, or just demonstrated it in computer stores.

As I said, I have not really investigated this issue myself so Beneath Apple Manor may well be the first CPRG. As I also said, however, I'm a bit skeptical. First off, I don't set much store by what MobyGames or Wikipedia has to say on the issue since pre-1978 microcomputer games are extraordinarily poorly documented (the ones in 1978 and 1979 are better but not much).
However, in the little research I have done, I've turned up one intriguing possibility. Back in the day, I had a collection of probably 1,500-2,000 Apple II games as well as a handful of magazines and catalogs listing games I didn't have, all of which I entered into an Excel spreadsheet several years back. Looking back over my spreadsheet, I found a handful of RPGs that may have been released in 1979 or sooner. One of them was a BASIC game called The Devil's Dungeon written by Dr. Charles William Engel.

A quick web search turned up this article: which gives a bit more info on the game. The copyright office lists a copyright date of January 10, 1978 and, intriguingly, a date of creation of 1977.

An ad for the game (from Engel's Tampa, Florida company, Engel Enterprises) appeared in the February 1978 issue of Byte and it was reviewed in the March 1978 issue of Interface Age, the April 1978 issue of Byte, and a 1978 issue of Personal Computing.

However, it appears that at this point it was only sold as a 15-page book containing a program listing in BASIC.  As the ad above indicates, Engel also published a book called Stimulating Simulations (copyright 1977), which was later republished in various editions for most of the early microcomputers. PDFs of both the original 1977 edition and the 1979 Atari edition are available on-line. The former does not include The Devil's Dungeon (which was being sold separately) but the latter does, along with a listing for the game and some sample runs.

Unfortunately, it gives little other info on the game's history. As for Engel, he was a professor of mathematics education at the University of South Florida with a B.S., M.S., and Ph.D. from Wayne State University. Around 1981, he helped establish the Florida Instruction Computing Resource Center, an organization dedicated to promoting the use of computers in education.

So could The Devil's Dungeon have been the first commercial CPRG? To answer that question, we must first decide if it was an RPG at all. The game was very, very simple (and that's putting it mildly), especially compared with games like Beneath Apple Manor. It was all text with no graphics of any kind. From this description, it may seem little different than games like Hunt the Wumpus and Colossal Cave, but unlike those games, it did include several role-playing-game elements, such as experience points, attributes (speed and strength), monsters, and treasure. (other features included poison gas and tremors). On the other hand, it seems to lack character development completely, which would disqualify it in some people's eyes. Personally, I lean toward saying that it qualifies as an RPG, but just barely though I may change my mind. Others, however, will likely disagree, especially given the lack of character development.

Even if it was an RPG, however, does a game that was only published in book form count as commercial? If so, what about all the other BASIC games that were published prior to 1978 in books like David Ahl's BASIC Computer Games the People's Computer Company's What to do After You Hit Return or in magazines like Byte and Creative Computing? I suppose it's a matter of opinion whether it counts as a commercial computer game, but in any event, it does seem to have been published prior to Beneath Apple Manor. As for other BASIC games, I am unaware of any previously published games that could be considered RPGs, but I need to review my library. Another question is whether or not it should be considered a personal computer/microcomputer game, since many of the BASIC games books were written before microcomputers appeared on the scene. My initial thought is that it should be. Yes, it was just one of many BASIC games and could have been implemented on a number of systems, but Engel appears to have aimed his book at microcomputer rather than mainframe users.

Also, it does appear that the game was later published on computer media of some sort. For instance, it was listed in Skarbek's Software Directory - a catalog of Apple software published in 1980 - as being sold by Rainbow Computing (a computer retailer in Northridge, CA that also published software). It was also included in A.P.P.L.E.'s Nightmare Game Pak, a collection of BASIC games for the Apple II. A.P.P.L.E. was the Apple Puget Sound Program Library Exchange, an early Apple user's group established in February 1978 that sold collections of games on tape and disk (in addition to other activities). I am not sure when Nightmare Game Pak was published, but this version is available as a disk image if you want to give The Devil's Dungeon a go on an emulator. Here are some screenshots from AppleWin:

As to when the game was published in book form, it appears to have been available by at least February 1978, and possibly (given the copyright information) in 1977. I was unable to find contact info for Charles Engel and am not sure he's still alive. He was born in 1935, so he would be 79 or 80 today. In any event, I think that at the least the game merits more research. And there's always the very real (in my mind) possibility that someone offered a CPRG for sale prior to 1978.

How about the second question: what was the first commercial microcomputer game? Here, information is much harder to come by and there does not really seem to be a consensus favorite. I've done even less research on this one than I have on the first, but once gain, I've unearthed some interesting candiates in the little resarch I have done.

On his personal website (, Peter Jennings (co-founder of Personal Software) claims that his program MicroChess was "the first game program sold for personal computers." Jennings originally wrote the game for the MOS Technology KIM-1 computer. It was first advertised in the November 1976 issue of KIM-1 User Notes and the first copy shipped on December 18.

Not to take anything away from Jennings and his achievement, but I am skeptical of his claim. A quick search turned up two earlier examples of computer games that were offered for sale.
In April 1976, and possibly earlier, Cromemco began running ads for its TV Dazzler, a color graphics card for the Altair 8800 and other s-100 bus microcomputers. The ad also offered three programs for the Dazzler for $15 each. One of them was John Conway's Game of Life.

Any guesses as to what format the games were sold on? If you guessed cassette tape, you are ------ wrong! Nope, these were sold on paper tape. Yes, despite what you may have heard, cassette tapes were not the first medium on which microcomputer games were sold.
OK, now some of you may question whether Life actually counts as a game. Personally, I am skeptical that it does. Stan Veit reports that Steve Wozniak also created a version of Life for the Apple I (that's I not II), though I don't know if it was offered for sale. In any event, by October 1976 (again, possibly earlier) Cromemco was selling Spacewar on paper tape for $15 for machines based on the 8080 microprocessor and that definitely counts as a game and was sold before MicroChess. Here is a the cover and first page of the game manual:

And here's the table of contents for TV Dazzler Games, a collection of games for the TV Dazzler published in 1977 on diskette. for $95.

So were these the first microcomputer games offered for sale? I seriously doubt it. I imagine there were a number of games available for personal computers prior to 1977 and surely a few of them must have been offered for sale (yes, I know that most software was swapped at users groups or typed in from magazines etc. but I can't believe no one was selling software). A few years back when the demoed an Apple I, they ran a Star Trek game on it and someone might well have made one for sale.

Another early game was Steve Dompier's Target. Most sources claim that Dompier created in 1977 for the Processor Techology Sol-20 (watch the video here: but Stan Veit claims that Dompier originally wrote it for Processor Tech's VDM-1, which was advertised in the first issue of Byte in September 1975. The ad, however, does not mention Target and Veit claims that the VDM-1 wasn't available until fall 1976 (despite the ad's claim that it would be available in three weeks, which only illustrates one of the pitfalls of relying on ads for game release dates).  There was also the Altair 8800 game "Kill the Bit" but I don't know if it was offered for sale (and it didn't use a monitor).

So what was the first commercial microcomputer game? Beats me. To answer that question would require, at a minimum, scouring all the back issues of computer magazines published prior to 1977 as well as ads in various users group magazines, fanzines etc.  So far, I don't know of anyone that had done that - and if they did, it still wouldn't give a definitive answer. One of these days, I may do it myself, but who knows when and if I'll have the time.

Finally, since I mentioned the TV Dazzler and Stan Veit, I thought I'd leave you with this story from his book Stan Veit's History of the Personal Computer - perhaps my all-time favorite book on personal computer history. Stan ran the Computer Mart in New York City, one of the very first computer retailers. One night he installed a TV Dazzler card, connected it to a color TV set, and ran the Kaleidoscope program that was sold for it (the program just displayed kaleidoscope patterns on the screen. At the time, the store was located inside another store called Polk's). I'll let Stan pick it up from there:

"One evening we put the TV set in the window. It was connected by a long piece of coaxial cable to the IMSAI computer in the back of the store, which had Kaleidoscope loaded into the TV Dazzler. We left the computer running when the store closed, and went home. Imagine that you are a motorist driving down 5th Avenue in New York City at night. All of the stores are closed. It's pitch black, except for the street lamps. As you approach 32nd St., you see dazzling kaleidoscope patterns in bright colors, playing across the face of a TV tube in a store window. Even a jaded New Yorker was sure to stop and see what was making this display. Naturally, when you stopped to see what was going on here, so did everyone else. It did not take long to attract a large crowd of rubberneckers, and this stopped traffic completely, creating a big traffic jam on one of New York's busiest avenues. Soon, the police came to unscramble the traffic jam and they quickly saw what was causing the  problem. Thinking that the pictures had to be coming from a TV broadcast (there were no VCR's in those days,) they called up all the local TV stations to find out who was broadcasting the images. The TV stations knew nothing about it. The police soon realized that the display had to be generated by something inside the store. First they called the owner, and then the manager, of the store. The manager had to come downtown all the way from the Bronx. We had to open the store, turn off the alarm, and then he disconnected the computer by pulling the power cord out of the wall. The next morning, when I came to work, he had a few choice words to say to me about the window display. If I ever pulled anything like that again, I was finished with Polk's store!"

What I love about that story is what it reveals about the early days of computers. It seems incredible now that a simple kaleidoscope program could stop traffic in one of the world's largest cities, but that's how unfamiliar people were with seeming computer-generated images on a television. Most people had never seen anything like it. That's why a game like Computer Space could leave people gaping in wonder.


  1. I don't know if this can help you, but the "Digital Deli" book (link here) presented a sort of Computer Time Line, in which is said that in 1975 «Objective Design of Tallahassee, Fla., offers Encounter, the first commercial personal computer game, in assembly language on paper tape.» Maybe this information could be useful for further research. Regards

    1. Thanks Andrea, that was very helpful. So far, I haven't been able to confirm the claim but I've only just started investigating (I did find the claim repeated in a 1991 newspaper article but they could have gotten if rom Digital Deli).

      The earliest reference to the game I've found so far is an article from the February 28 1977 Computerworld announcing that Objective Design was "offering" the game for $12.95 ($16.95 on paper tape). It was written in Intel 8080 assembly language and ran in 4K of RAM. Interestingly, it required two keyboards. Of course, they could have offered a version of the game earlier.

      Another Computerworld article (May 1, 1978) mentions a Star Wars game they sold that was based on the movie's Death Star battle as well as a Z-80 programmable character generator and an S-100 cardframe construction kit. The only other leads I've found are that the company was founded in 1976 and its officers were Larry R. Weinstein (president), John Barry Mattan (treasurer), and William J. Bigler (director).

    2. Yes, you're right. According to several online sources, Objective Design was incorporated on December 21 1976, so it seems impossibile that they could create a videogame a year before. So I wonder why the Digital Deli writer (Carol Iaciofano) could be able to make such a strong statement about the first personal computer game. Just for information, I began searching for Objective Designs because it was cited on an italian magazine in 1992 I've collected in my blog (link here).

    3. Well, they could have been in existence for some time before they incorporated or could have incorporated earlier under a different name, etc. so it's possible they released the game in 1975. What makes me a bit suspicious is the incorporation date combined with the announcement if Encounter just two months later. As you said, though, even if it was released in 1975, I wonder what led the author to claim it was the first.

    4. This comment has been removed by the author.

    5. I've also been researching Objective Design, Inc. for a few years now mostly looking for info. on their Star Wars game and to verify/disprove Digital Deli's timeline. The earliest mention I find of the company is that same Feb. 28, 1977 Computerworld article.

      It appears the company was mostly a computer hardware manufacturer but, in addition to publishing software to operate their hardware, they put out at least two computer games: "Encounter!" and "Star Wars." I own a copy of the Encounter! manual and source code but find no copyright date for the game. The source code is interesting as it includes guidelines for how to mod the game and change it to your liking.

      Encounter! required two keyboards as it was played in real-time. "There is no taking turns," the manual states. Both players may input commands simultaneously. This was the first real-time strategy game!

      The game was also available on Tarbell tape (with complete rules and source code) for $19.95.

      The "Star Wars" game debuted at or around the Second West Coast Computer Faire in 1978. The July 1978 issue of Byte magazine shows a photo of Larry Weinstein and Star Wars.

      [deleted above comment to fix an error]

    6. Do you have any intention of publishing that manual and source code online, for example through Encounter is a very interesting game, and I think it would be worthwhile to have it preserved.

      For people that want to know more about that game, there is a nice article describing it in the May 1978 issue of Creative Computing.

  2. You always tickle something in the back of my brain whenever you make question posts, as well as the computer stuff. I love learning about early personal computing and the games market of that time seems to have endless possibilities. Add CRPGs in? Now you're trying to throw me off course from my own research!

    I've been renewing my interest in PLATO lately, mostly because of Silas Warner (if you ever want to do a blog post on him, hit me up because I've contacted a lot of people thus far) and I talked with Brian Dear a bit about the book. He says that he'll have an announcement coming up soon, and I'm quite excited. There's so many more depths to be plumed with PLATO and were I not so one track-minded about my intent in researching it I would try and explain it in detail, possibly through a blog.

    I'm kinda gnashing my teeth a bit about the Dungeon Campaign copyright date. I put it and Beyond Apple Manor together in my script but now with this knowledge in hand I might just not talk about it altogether. Where do you come across these copyright dates by the way? I imagine it's not always as easy as looking in Google patents.

    I kind of like that advertisement "Stimulating Simulations". Clever wording that I'm sure SSI would have used if they thought of it! Someone definitely needs to track this game and its creator down, if possible. We could discover a whole new roots corner of the software industry if we manage it.

    "A few years back when the demoed an Apple I, they ran a Star Trek game on it and someone might well have made one for sale."

    The Apple ][ History website has what I believe are commercial versions of a couple Apple I games, so they definitely had a market (though immensely miniscule).

    This question will remain a tricky one to solve. You've narrowed the importance of it down pretty well, but I'm sure that the end result is going to be unremarkable, something like "I made this number tic-tac-toe game and sold it in a software package about two weeks after the computer was released". Though that feeds into further information about the computer environment... Never say "unremarkable" as a historian! We're the best at reading between the lines of straight facts.

    1. The US Copyright Office has a searchable database fro copyrights from 1978 on. The earlier ones were kept in printed volumes, which have now been made available online at

      The Asimov archive has a small collection of Apple I software, including a handful of games: 21, Life, Hamurabi, Slots, Reverse, Wumpus, Star Trek, Rock Paper Scissors, MicroChess, Lunar Lander, Deal or No Deal, and Codebreaker.

      Some of them (like Deal or No Deal, written in 2005) are modern while the rest appear to be standard BASIC games from Ahl's book.

      I take it you've already listened to the talk Silas Warner gave at Kansas Fest?

    2. "I take it you've already listened to the talk Silas Warner gave at Kansas Fest?"

      Yep, and I'm hot on the trails of some voice samples which were apparently put to disk some years ago of Silas as a disk jockey in college. Finding out all the buried information about him has been very fulfilling, though also frustrating in the usual researching way. Nevertheless, I pursue.

      Thanks for the heads-up about copyright dates. Now if only Japan's were so easily searchable that far back...

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  4. Looking at the hex dump of a copy of the Target game that survived on tape:

    0D60: 21 F3 0D CD E6 00 76 21 02 0E C3 63 0D 59 CC 54 !.....v!...c.Y.T
    0D70: 41 52 47 45 54 FF 13 CD 23 20 43 4F 50 59 52 49 ARGET...# COPYRI
    0D80: 47 48 54 20 31 39 37 37 20 23 FF 5B CD 42 59 FF GHT 1977 #.[.BY.
    0D90: 8C CD 50 52 4F 43 45 53 53 4F 52 20 54 45 43 48 ..PROCESSOR TECH
    0DA0: 4E 4F 4C 4F 47 59 20 43 4F 52 50 4F 52 41 54 49 NOLOGY CORPORATI
    0DB0: 4F 4E FF 07 CE 56 45 52 53 49 4F 4E 20 32 2E 34 ON...VERSION 2.4
    0DC0: 20 20 20 4A 41 4E 55 41 52 59 20 37 2C 20 31 39 JANUARY 7, 19
    0DD0: 37 37 20 20 20 53 2E 20 44 4F 4D 50 49 45 52 FF 77 S. DOMPIER.
    0DE0: 0B CF 54 41 52 47 45 54 20 43 48 45 43 4B 53 55 ..TARGET CHECKSU
    0DF0: 4D 20 2D 00 1C CF 20 56 45 52 49 46 49 45 44 20 M -... VERIFIED
    0E00: 4F 4B 00 1C CF 20 23 23 23 20 20 45 52 52 4F 52 OK... ### ERROR

    Version 2.4 from January 1977, so there have been releases in 1976.
    The game requires a VDM-1 video board, it runs on all S100 systems available at that time equipped with a VDM-1, like Altair 8800, IMSAI 8080, Cromemco Z-1, Sol-20 ...