Relationship of qdos to cp and ms dos

What is the relationship of QDOS to CP/M and MS-DOS? | Wikianswers | FANDOM powered by Wikia

The origins of MS-DOS can be traced back to two earlier operating systems, CP/ M and QDOS. CP/M (AKA Control Program for Microcomputers) was created in. In many ways, the Microsoft empire was built on MS-DOS. It acquired DOS – originally called QDOS, short for "quick and dirty operating Spoiler alert: he didn't find any evidence that MS-DOS copied code from CP/M. Pete-Erin Relationship Dunderpedia: The Office Wiki · Amazon's 'Lord of the Rings' Series Should Stay PG FANDOM · Chase Skylander Boy and Girl Wiki.

It's interesting to see how Ctrl-C works in lots of places and even on modern Linux systems. Being a doshead, when I moved to Linux I found that some of the keystrokes that I had ingrained in my brain just worked when I needed them.

A Code Correlation Comparison of the DOS and CP/M Operating Systems

Too bad the GUI world will probably never have such universal language. Forty years later I can hit Ctrl-C and it still works. These things run so deep that it would be worth knowing the "exact" date of introduction.

It also mentions the final release of Tops as being Presumably it was used for some years after that, but even then, twentyone plus years is pretty impressive. Ctrl-C has even outlived the power switch which stopped working some years back.

The other thing that is handy is that you are not tied to a particular language. Eg with modern chips, you are stuck with Basic on a picaxe, C on an arduino and Spin on a propeller.

Sherlock Holmes and the Heart of DOS

I like the flexibility of being able to code in various different languages. Especially if there is existing code already written - eg writing a neural network simulation in basic but doing the FFT analysis in C.

DOS kept evolving with more and more things being added so it has a lot more commands. Then you can run programs like PIP to do the copy. So there are synergies you can build with DOS. Raven April 30th, I'd like to know everything there is to know about all computers an ambitious goal, to be sure, and probably unattainablewhich gives me something to do at any given time. I'm curious where this thread will end up going, and have been enjoying it so far. As well, I am going to be writing my own operating system bit by bit over a long period of time.

I have started with the shells, since that's my favorite, and am working my way down. MikeS April 30th, Fallo April 30th, Software like WordStar would come with a setup program you'd run to configure the video display and things of that nature. Meanwhile, Gary Kildall felt that he'd been horribly cheated and that Bill Gates got credit for his work.

In a magazine interview, he said something to the effect of "I'll bet Gates doesn't know why function 9 requires you to terminate strings with a dollar sign. Chuck G May 1st, That lack of PC compatibility really doomed them when the cheap Far East clones flooded the market. It's that--and not the introduction of the that really killed off alternative PC architectures.

It was designed for floppies and worked well--but gets limited and awkward for hard disks--and is impossible on larger hard disks. In text files, the convention was to end the file with a hex 1A character--something that many DOS utilities still support.

It's something that a lot of people don't appreciate. It wasn't the IBM that doomed other systems. Tez Chuck G May 1st, One thing that I've never seen any documentation for was something a friend from Taiwan told me at the time.

He claimed that the success of the PC clone at least for the s was largely due to the efforts of the Taiwanese government, providing reference designs, documentation and even BIOS code. This appears to have some truth--I've got several different flimsy no-name booklets for peripherals printer cards, floppy controllers, MGAs, etc.

And the Taiwan clones were "Clones", not "clones". Can anyone substantiate this government sponsorship and provide a bit of history behind it? Chuck G 's post, I've wondered that myself. I've never really seen a ton of Taiwanese S stuff, for example.

Just to my knowledge, I may definitely be wrong on this. I wonder if the Taiwanese government saw this as an opportunity to keep their new-found talent for electronics manufacturing gained from flooding the U. And here was a brand, new, free for all.

Working to build a CPM3 version that will work with my 3. I have a design 'on-the-boards' for a new laptop-type machine with paged memory for just this reason! Cheers and Happy New Year to everybody! D Chuck G January 2nd, And I didn't consider DOS 1. The release of Concurrent DOS seems to verify this. Ole Juul January 2nd, Not having a file system "tree" is a huge limitation, similar to a book library putting all their books in a pile inside the door.

That is obviously impossible to use for professional information management purposes. The device drivers meant support for connecting both software and hardware to the system.

In short, from March of DOS became a different world. I used to see them by the ton, literally. They were shipped as ballast, then would be left in cord-sized stacks on the dock under a tarp with a guy standing nearby.

You would buy them by weight, picking boxes from the lot that had the least water damage. Duds were common, but you could buy assembled and populated cards for a fraction of the price of a single card bought normally. If you were a techie, you could buy a bunch of cards and put together a couple of full-up systems. Keep one, sell the other, make a profit and still have spares plus scrapper boards.

relationship of qdos to cp and ms dos

If you were lucky you could build 3 complete systems from buying 4 of each card. By that time they were affordable when sold above-board, too. Which was a good thing since there'd been some crackdowns on the dockside sales.

Chuck G January 3rd, The ERSO thing didn't get going until the early 80's. My website mostly contains programs which have been written using Turbo Pascal 3, though in recent times have been focusing on the Hardware provided from the Amstrad CPC computer range, needless to say there are some generic programs there as well and a Game which I've left Generic, I'm working on another one now which I'm hoping I'll be able to get away with using Generic Code and then enhancing it a little bit.

Depending on what your using though may depend on what you can get away with.

What is the relationship of QDOS to CP/M and MS-DOS?

It's still very good for an operating system which is nearly 30 years old though - without the support of FIDDs which is it's own version of DOS TSRs, it's interesting to see what could be done!

D Chuck G January 3rd, Kildall later said that he met IBM negotiator Jack Sams on a flight to Florida that evening, negotiated a deal on the flight, and shook hands on it. Sams denied ever meeting Kildall [1] [3].

relationship of qdos to cp and ms dos

This was not true, as explained in the next section. Legal Background A copyright is a form of intellectual property protection for the expression of an idea. From its beginnings, copyright has protected creative text, and software source code is inarguably creative text. While the Copyright Office was trying to determine how such a deposit could be registered, two short computer programs were submitted on April 20, by Columbia Law student John Francis Banzhaf III [12].

The Computer Software Copyright Act of formalized the submission requirements for software, and the number of software source code copyright registrations exploded shortly thereafter [12] [13]. Note that a copyright exists, and the owner is entitled to all copyright protections, whether it is registered with the US Copyright office or not. These are the only tools that have been accepted in US courts and that has been used in over 60 software copyright cases.

A standard, accepted forensic analysis process was also used to filter the results [17] [27]. It narrows down areas in different source code files that are correlated. There are six reasons that code can be correlated: It is possible that widely available open source code or third-party libraries are used in both programs. Automatic code generation tools generate software source code using similar lines of code. Certain identifier names are commonly taught in schools or commonly used by programmers in certain industries.

There may be an easy or well-understood way of writing a particular algorithm that most programmers use. Two programs written by the same programmer will have style similarities. Code was copied from one program to another causing the programs to have similarity.

The files on the disk are executable binary files. There was some correlation of programming statements in the two programs, but these matching statements look like fairly common, simple statements.

The statement CALL means that a procedure is being called, and in both cases these procedures simply terminate a line of text with a carriage return and a line feed. So the occurrence of this term in both programs can simply be attributed to common algorithms and common identifier names. A full list of statements found in both programs is given in Table 1.

A full list of identifiers found in both programs is given in Table 1. A full list of comments and strings found in both programs is given in Table 1. There were no significant sequences of instructions that matched between the two programs, which would show similar, possibly copied functionality.

There were sequences of DB and DW statements, also common programming language techniques, that simply define data in the program, but the data values did not match. Most of the correlation was due to partially matching identifiers, where only part of the identifier names are identical.

This can be a clue to copying where a programmer changed the names enough to appear different but still retain some meaning. For example the variable name FirstName might be changed to Fname. Examination of these elements shows them to be commonly used identifier names or random characters. The entire filtering process is shown in Figure 1.

If an element is found in two programs and is also found many times on the In Figure 1. Filtering process to find copying. If it is found in two programs but nowhere else on the Internet, then it is likely due to copying. Normally all matching elements that had any hits on the Internet would be filtered out.

In this case, in order to be a little more liberal, only filter out matching elements that were found more than times on the Internet. In this way, even things that were found in other programs or documents on the Internet would not be filtered out. After filtering, no identifiers remained, but one programming statement and two comments did remain4. Common Statement The statement that remained after filtering was: This looks like a combination of com, which could refer to a communications port or a command, and err, which typically means an error.

One educated guess was that comerr is a routine that handles either communication errors or command errors, but it was necessary to look at the actual code routines. These are significantly different routines.