DOSBox emulates the CPU, the sound and graphic cards, and other peripherals of a PC, all at the same time. The speed of an emulated DOS application depends on how many instructions can be emulated, which is adjustable (number of cycles).

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• 1How to speed up/slow down DOSBox

How to speed up/slow down DOSBox

CPU Cycles (speed up/slow down)

. Designed: (326 sounds) Volume 1 of this magic saga is comprehensively focused on 6 elements: Earth, Ice, Fire, Air, Black, and Generic. Each element comes with a variety of spells, actions/movements such as whoosh, impacts, atmospheres, projectiles, along with many variations in intensity and speed. The magic behind the Magic Sound Box is that it doesn't need a Bluetooth or any other fancy wireless connection to amplify audio. Just rest your smartphone on top and abracadabra! The audio gets.

By default (cycles=auto) DOSBox tries to detect whether a game needs to be run with as many instructions emulated per time interval as possible (cycles=max, sometimes this results in game working too fast or unstable), or whether to use fixed amount of cycles (cycles=3000, sometimes this results in game working too slow or too fast). But you can always manually force a different setting in the DOSBox's configuration file.

You can force the slow or fast behavior by setting a fixed amount of cycles in the DOSBox's configuration file. If you for example set cycles=10000, then DOSBox window will display a line 'Cpu Speed: fixed 10000 cycles' at the top. In this mode you can reduce the amount of cycles even more by hitting CTRL-F11 (you can go as low as you want) or raise it by hitting CTRL-F12 as much as you want, but you will be limited by the power of one core of your computer's CPU.

You can see how much free time your real CPU's cores have by looking at the Task Manager in Windows 2000/XP/Vista/7 and the System Monitor in Windows 95/98/ME. Once 100% of the power of your computer's real CPU's one core is used, there is no further way to speed up DOSBox (it will actually start to slow down), unless you reduce the load generated by the non-CPU parts of DOSBox. DOSBox can use only one core of your CPU, so If you have for example a CPU with 4 cores, DOSBox will not be able to use the power of three other cores.

You can also force the fast behavior by setting cycles=max in the DOSBox configuration file. The DOSBox window will display a line 'Cpu Speed: max 100% cycles' at the top then. This time you won't have to care how much free time your real CPU's cores have, because DOSBox will always use 100% of your real CPU's one core. In this mode you can reduce the amount of your real CPU's core usage by CTRL-F11 or raise it with CTRL-F12.

CPU Core (speed up)

On x86 architectures you can try to force the usage of a dynamically recompiling core (set core=dynamic in the DOSBox configuration file). This usually gives better results if the auto detection (core=auto) fails.

It is best accompanied by cycles=max. But you may also try using it with high amounts of cycles (for example 20000 or more). Note that there might be games that work worse/crash with the dynamic core (so save your game often), or do not work at all!

Graphics emulation (speed up)

VGA emulation is a demanding part of DOSBox in terms of actual CPU usage. Increase the number of frames skipped (in increments of one) by pressing CTRL-F8. Your CPU usage should decrease when using a fixed cycle setting, and you will be able to increase cycles with CTRL-F12. You can repeat this until the game runs fast enough for you. Please note that this is a trade-off: you lose in fluidity of video what you gain in speed.

Sound emulation (speed up)

You can also try to disable the sound through the setup utility of the game to reduce load on your CPU further. Setting nosound=true in DOSBox's configuration does NOT disable the emulation of sound devices, just the output of sound will be disabled.

Also try to close every program but DOSBox to reserve as much resources as possible for DOSBox.

Advanced cycles configuration

The cycles=auto and cycles=max settings can be parameterized to have different startup defaults. The syntax is

Example: Download black hawk down.

This will use cycles=5000 for real mode games, 80% CPU throttling for protected mode games along with a hard cycle limit of 20000

Emulated CPU equivalency

It's rough speed level of emulated CPU for different host CPUs. For core=dynamic (cycles=max), while core=normal may to be 5 times slower. Different applications, even their parts, may have different this dependency. An application's and the emulator's settings affect too, - for example, sound's settings.

Note: Based on Speed Test 1.14 and other.

Rough dependency between cycles and emulated CPU. Different applications, even their parts, may have different this dependency.

Note: Based on Speed Test 1.14

See also

Other benchmarks

• Snooper 3.44 (chart)

This app is only available on the App Store for iOS devices.

Description

This app is designed to help your child master the letter-sound connection. This app uses four different games to help your child learn and reinforce their knowledge of which sound each letter makes. Each game involves seeing letters and hearing sounds. The child decides which sounds do and which sound do not match the letter(s) being shown. The child either identifies the correct answer by tapping or drags and drops the correct answer in its place.
This app is the third app in the ABC MAGIC PHONICS series. This app builds on the skills learned in the first two apps of this series. Those apps were about teaching letter/sound associations using phonetic pictures. This app focuses only on the sound of the letter and does not use any phonetic pictures as cues. We recommend the other ABC MAGIC PHONICS apps as means to develop and reinforce your child’s phonics skills and reading abilities.
Please note, that in this app, only the SOUNDS of the letters are used and NEVER the names of the letters. A child can actually read without knowing the common names of the letters, but a child only knowing the names of the letters cannot phonetically read. The ubiquitousness of the ABC song both at home and at school will surely give children the ability to name the letters. Many children, however, are not given the much-needed explicit instruction of the SOUNDS that the letters make. This app, therefore, is dedicated to helping children learn the SOUNDS that the letters make.
Only lower case letters are used, which is the most effective way for teaching children letters since 95% of the printed word is lowercase.
These games are designed so that children can do them independently after being given the basic instructions of how to play the games. The app has built-in feedback mechanisms to help the child to work independently. These mechanisms allow the child to learn at their own pace and in their own way.
Some pictures may seem indiscernible, but don’t worry, the pictures, when touched, will ALWAYS say their name. The child NEVER has to know what the picture is ahead of time. Tapping on the image box will ALWAYS play the audio file that names the picture.

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Ratings and Reviews

4 Games for learning letters

This app has 4 games for helping children learn the sound that each letter makes. I love that it uses lowercase letters.

top notch app

Excellent way for children to learn letter sounds. Very fun app!

Information

Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.

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