MS-DOS, which was the most widely known operating system of the pre-Windows times on the IBM PC platform, has several unique software titles either not available on other platforms or of considerably better quality than on other platforms. This means emulating MS-DOS, in cases, may be either the only or the best way to get a particular title, let it be an application or a game, run on your Windows Mobile (WM for short) handheld.

 In this article, you’ll find ALL (and I certainly mean this!) information you’ll ever need to successfully select and use an MS-DOS emulator.

(Note that, in this article, I refer to all DOS operating systems of the IBM PC as “MS-DOS”. Naturally, the discussion also applies to DR-DOS and PC-DOS and, in this roundup & tutorial, instead of elaborating on the basic operating system itself, I mostly concentrate on the most important aspect of these operating systems: running third-party applications and games.)

1.1 Why an article on MS-DOS emulators?

1. there are no similar all-in-one articles, let alone in-depth ones. The very few articles ever written on the subject only discuss one of the (several) available emulators, PocketDOS.
2. the majority of current emulators, particularly the most recommended DOSBox port by n0p, HEAVILY lack any kind of a decent tutorial. In here, you will find all the information you'll ever need configuring and running these titles.
3. there are many different emulator versions from a lot of developers; this may make the life of a newbie to MS-DOS emulation VERY hard.
4. Windows Mobile forums are FULL of contradicting and plain bad, unreliable information on these emulators. Someone had to, finally, get the facts straight.
5. the BEST MS-DOS emulator (that of n0p), being of Russian origin, is mostly discussed in Russian language forums. As one of the several languages I speak is Russian, I understand what is discussed there. That is, in this article, I also build on the information found in Russian forums, making it unnecessary for my readers to suffer from the Babelfish “translation”. To a lesser degree, I've also found some useful user reports & tips in German (which I also speak) forums; I’ve also incorporated the info found there in this tutorial & roundup.
6. my old, related article (Another reason to get a VGA device – running Legend Entertainment's old adventures reviewed) is heavily outdated because of the brand new DOSBox ports
7. as the Nominations Manager at Smartphone and Pocket PC Magazine, I have to know everything about Windows Mobile apps. This article also shows I do :)

1.2 Why should you bother?

As has already been pointed out in the introduction, MS-DOS has several quality titles either not available on other (with a usable WM emulator) platforms or the quality of these titles on all other platforms (again, with emulators) are clearly inferior to that of the MS-DOS version. For example, the evergreen games by Legend Entertainment is a very good example of these (they haven’t ever been released for other platforms). If you don’t know what these games are but you like text-based, high-quality adventures, make sure you give them a try – they’re certainly worth it. And the list of excellent, MS-DOS only titles continues; for example, Betrayal at Krondor was also a PC-only release. This means MS-DOS was a VERY strong gaming platform in the early 1990’s with tons of high-quality or unique titles worth playing even today.

However, in other cases, MS-DOS emulation is NOT something you should always prefer to emulating other platforms or looking for native WM (re)implementations / ports of the same game. For example, as far as games are concerned, with games that only had an MS-DOS version, there may be better emulators (most importantly, "partial" interpreters "only" running a specific type of games; most importantly, from a given game publisher) to run the game than a fully-fledged, full MS-DOS emulator. In addition, some (not many) classic titles have their own WM implementations / ports; examples of these include UFO (the reimplementation is Pocket UFO; see my quick review HERE and the PocketGamer thread HERE), Civilization (Pocket Humanity; unfortunately, FreeCiv has no direct port; PocketCiv only runs on Linux-based handhelds), Pipe Dream (having several WM reimplementation; see for example the Roundup of All Pocket PC Games Part I for some of them), Doom (DoomPPC / DoomGL ES are excellent), Wolfeinstein 3D (see pocketinsanity’s port) etc.

Note that the (vast?) majority of MS-DOS emulator users use emulators for gaming (it’s mostly games that haven’t been released on other platforms or are unplayable / far more awkward to play in emulators); therefore, in this article, I also concentrate on gaming issues. This, however, doesn’t mean you will be unable to make use of it if you, for example, plan to run your old MS-DOS-based apps.

1.2.1 Cases you will NOT want to use an MS-DOS emulator - I: existing ports on other, more Windows Mobile-friendly platforms

For example, if you want to play, say, the infamous Prince of Persia (which doesn't have a direct WM port), I would say you’d better get a NES (Famicom) emulator. The NES version of Prince of Persia is very similar to that of the PC; however, the NES version in no way requires as much resources (including battery power) as the MS-DOS one. Please see THIS for a complete review of NES emulation.

The same stands for, say, Xenon 2 or Risky Woods. Running them in a Sega Mega Drive / Genesis emulator is a much better choice than ding the same in an MS-DOS emulator. The Sega Mega Drive / Genesis emulators require less resources, have better sound (particularly with Xenon 2, which, on the IBM PC, only had speaker sound), are easier to control and produce higher frame rates (just as with NES and Price of Persia) than the current MS-DOS emulators. See THIS for a complete explanation.

These are not hard-and-fast rules. That is, it can't be stated "whenever a port of a game exists on a better-emulated platform, stick to it and forget MS-DOS emulation entirely". When selecting an original platform and an emulator to play a given title, you may want to prefer other, better-emulated platforms for action games like the above. For mouse (stylus)-based, generally, adventure and strategy games, on the other hand, you may want to prefer MS-DOS emulation. For example, compare the following two screenshots, showing Sierra's King's Quest 5 on a(n emulated) VGA PC (running the VGA version of the game) and on the NES (Famicom):

The difference in the visual quality is staggering, isn't it? And, the better visuals are just part of why the MS-DOS version is much more worth playing. The NES' not having analogue / mouse-like input, its cursor needs to be controlled by a (digital) D-pad. This means it's REALLY hard to control the game with the D-pad only.

Incidentally, the same stands for games running on other (mouseless console) platforms like the GBA version of X-COM. These kinds of games should be played under an MS-DOS emulator because they allow for stylus usage, unlike GBA emulators.

1.2.2 Cases you will NOT want to use an MS-DOS emulator - II: existing interpreters for a given game

As has already been pointed out, a specific subset of MS-DOS games have so-called 'interpeters', which run the games without emulating a full MS-DOS environment. This may be advantageous in many respects:

1. as they only need to run the game (and not an emulated operating system), they, generally, consume far less CPU cycles (and, therefore, both run flawlessly on slower and/or underclocked machines and result in a decent battery life). A well-known example of this is the Magnetic Scrolls interpreter (see review & tutorial HERE), which runs old, freely and legally (!) available Magnetic Scrolls textual adventures in a really CPU- (and, consequently, battery-) friendly way.
2. they, in cases, are much better integrated into the operating system. Again, an great example of this is the Magnetic Scrolls interpreter. It uses a standard text area (with some extras; for example, automatic text expansion of highlighted text) and standard, relocatable picture boxes. This also means it's, for example, possible to copy some of the text onto the clipboard. What is more, these operating system-level components are compatible with all kinds of operating system versions and configurations. This isn't always the case - let me point out that, for example, (W)VGA and square screens are not supported by many emulators (including, unfortunately, the most recommended one by n0p). Now, compare the quality of the rendering of the in-game text when done by the Magnetic Scrolls interpreter and n0p's MS-DOS emulator (not supporting (W)VGA screens). Yes, the difference is enormous - the interpreter-based version is perfectly playable even on a square-screen or a low-resolution (QVGA) device, while the original MS-DOS game rendered by n0p's emulator is fully unplayable on any Windows Mobile devices because of the emulator's not supporting high-resolution screens, while the games itself used EGA high-resolution.

Of course, it's not only the Magnetic Scrolls games that should be played in the related interpreter, but also a lot of other titles. For example, the earliest Sierra games should all be played under PocketSarien (review & tutorial HERE); most of the Lucasfilm games run better under PocketScumm than under MS-DOS emulators and so on.

There are exceptions, though; the most important being FreeSCI, the interpreter of (early) Sierra SCI games (released in 1989 and 1990). This is so uselessly slow that you will want to prefer an MS-DOS emulator to playing them under FreeSCI. (See THIS for more info.)

1.2.3 Cases you will NOT want to use an MS-DOS emulator - III: existing, native ports available for WM

It’s always preferable to play native WM ports / versions over emulating (if the quality of the port is at least comparable to that of the original running in a high-quality emulator), mostly because of CPU usage and hardware requirement issues. An emulator generally requires (unless we’re speaking of for example BitBank’s SmartGear, which has really modest hardware requirements) a far more powerful hardware than a native game. This means (most and, with emulating MS-DOS, all) emulators are either hard (at least without excessive overclocking) to run on slower devices at a usable speed or, on faster devices, they result in a very quick battery consumption because of the high processor usage.

Now that we’ve seen the cases where using MS-DOS emulators is NOT recommended, we can return to the original subject: running titles that are worth running under MS-DOS emulators because there isn’t another way of making them work.

Let’s see how you can acquire MS-DOS apps (if you don’t have the ones you’d like to play around) and, then, move on to introducing the (current) emulators.

1.3 Getting MS-DOS games

Start with the Wiki page List of commercial games released as freeware. Make sure you get games released before 1994 (or, if you can stand the increased slowness, 1995).

I am not allowed to provide you direct (!) links to so-called 'abandonware' sites. However, if you just use Google, you will find them at once. Also, if you spend more than five minutes at browsing Vogons, the highly useful DOS emulation page, you'll find thousands of links to these sites (it seems some people and even official forums don't take down abandonware links. However, I still refrain from giving you generic URL's, just to be on the safe side.)

Don't be afraid of dowloading from well-known abandonware sites. If you really are afraid of viruses, make sure you don't run these titles directly on your desktop PC, only under an emulator. Then, even if it, for example, formats your (virtual) hard drive (that is, the directory you give it as a hard drive), the damage will be limited. And, rest assured, it won't do any harm to your device. For this test, I've downloaded the games from abandonware sites so that I can test the games they host for viruses and trojans. I haven't found anything. That is, you can absolutely safely download from these sites.

1.4 What can I run?

Generally, games (and, of course, apps) released before 2004. Try NOT to play 3D games (this also includes classics like Betrayal at Krondor - they won't be very fast). You can have success with later, not very graphics-intensive games (for example, adventures).

1.5 Can I run Windows XP on my Windows Mobile device?

Nope. Under the most recommended emulators (n0p's DOSBox port and PocketDOS), all you can do is run Windows 3.11 if you want. I, however, don’t really recommend It - it's the best to stick to emulating strictly MS-DOS applications and games.

With Mamaich's (old) Windows Mobile port of Bochs (Bochs is a full x86 emulator, not just an MS-DOS one), however, you can even install Windows 95 as is described in THIS very long thread (also linked from PPCT). (You'll also need this Nano98 and this micro95 (also see THIS and THIS) tutorials for ripping Windows 95 and 98. Also see THIS for more info.) You, however, won't be able to do anything productive with these installs: it's REALLY slow and has major problems with input devices. That is, don’t even bother reading through these threads – not even the basic operating system will run flawlessly, let alone apps / games. Don’t even think of running for example Starcraft on a Windows Mobile handheld.