Free emulators software for linux

Wide Area Link Emulator enables you to set and test various parameters of a WAN access link (also known as a bottleneck link) before testing on a fully-functional network.

Any ISP has a high bandwidth LAN (of the order of tens of Mbps, e.g. Ethernet) and a WAN access link with relatively low speeds (of the order of a few Kbps to a few Mbps). To be able to evaluate the ISPs performance, actual tests will have to be conducted on a live, fully functional network. This would imply enabling certain features in communication equipment which could be detrimental to the proper functioning of a commissioned network. To address such a problem of being able to characterize/quantify the network operation in terms of its performance with respect to various parameters, a test-bed emulating the ISPs connectivity to the Internet would be an ideal solution.

An important factor in setting up such a test-bed, is emulating the WAN Access Link. Using complex hardware is costly. Such a link can however be easily implemented by emulating the scenario on popular physical technology such as Ethernet. By changing the TCP/IP stack on a Personal Computer, the rate at which packets are injected into the network can be controlled and other necessary features can easily be added.

WALE was implemented in 2 phases and the first version can emulated bandwidths up to 8Mbps and uses FIFO queues with drop-tail.

WALE v2 can emulate bandwidths of up to 80Mbps(a 10-fold improvement over version 1) due to the stripped down version of Micro-second resolution timer being used in the Linux kernel. WALE also implements differentiated services are recommended by IETF. A hash-based packet classifier is used to classify packets into one of 3 queues (Expedited Forwarding, Assured Forwarding and Best Effort). A simple priority scheduling has been implemented between the queues.

Version 2 has been implemented in the Generic Device Layer of the Linux Kernel. The kernel version is 2.2.19. WALE2 kernel patch can be downloaded here. An ncurses based front end has been implemented for setting and viewing various parameters of the bottleneck link.

cereal is an emulation framework designed to allow easy emulation of interconnected modules. Its main component is an 8051 emulator module, so it can be used as an 8051 emulator.

The reason for writing cereal was an 8051 embedded controller which should control an engine using pulse-width modulation, read the resulting flow from a flowmeter, and regulate the output to keep flow at a given value.

In the real world, it takes about two seconds for the algorithm to stabilize, and emulating two seconds using conventional emulators (computing the engine input, the real flow, the feedback frequency) by hand is simply impossible to do.

Using cereal, it took about two hours to create a module emulating the engine/flowmeter combination, along with a window showing the current values. Then it is trivial to connect this module to the 8051 module and just sit back and watch the result.

Another, more trivial example is a multiplexed display/keyboard combination (in my case, selecting one of four 8-segment LCD displays). Instead of watching the port bits, why not create a module that shows the output graphically as four displays?

In addition to these possibilities, cereal offers breakpoints, watches, evaluate/modify dialog (which can solve 2 * x + 1 = 5). The KDE GUI also can be extended using KParts (8051 interface is provided as a KParts plugin).

Also included is a command interface usable for creating testsuites for your programs (or for cereal itself - cereal has over 400 tests in its testsuite), and a simple 8051 disassembler.

Gemu News is a SuperKaramba theme that displays the latest version of compatibility layers like wine and the latest version of emulators like dosbox. The version of xqf is also listend.

By clicking on the globe youll get on the homepage of the driver/tool.

Im looking forward for your feedback.

GNOME FCE Ultra (also known as gfceu) is an interface for the popular Nintendo Emulator, FCE Ultra. GNOME FCE Ultra is designed for the GNOME desktop, and allows the user to easily play NES ROM images.
Main features:
- Network play
- Custom input configuration
- Fullscreen support
- Full sound support
- High compatibility and accurate emulation

QEMU is a fast processor emulator. Using dynamic translation it achieves a reasonable speed while being easy to port to new host CPUs.

In its user mode emulation mode, it can launch Linux processes compiled for one CPU on another CPU. Linux system calls are converted because of endianness and 32/64 bit mismatches.

In its full system emulation mode, QEMU emulates a full system, including a processor and various peripherials.

KRepton project is an implementation of the classic Repton 3 game, which was originally produced for the BBC Micro and was the third successful Repton game for Superior Software. KRepton brings the original game to the KDE desktop, and can be used on any of its supported platforms.
The game and editor are released under the GNU General Public Licence, although I would suggest that, if you make any improvements or modifications, that you send me a copy so that they can be incorporated into updated versions.
The current version 4.0 integrates the game player and editor into a single seamless application, so there is now of course only one download. An episode can be selected using a graphical preview list, and immediately played or edited, without having to switch between two separate applications.
If you have fond memories of the original Repton games then you wont need to be told any more; download and play the game now! If you dont know anything about them but would like to find out more then there is far more information online than I could list here; the best site by far is the Repton Appreciation Society with plenty of Repton information and downloads, including games and emulators for many other platforms.
Enhancements:
- Version 4 integrates the game player and editor into a single seamless application.
- An episode can be selected using a graphical preview list, and immediately played or edited, without having to switch between two separate applications as was the case with version 3.

The P65 assemblers are assemblers for the 6502 microprocessor (such as is used in the Commodore 64, Apple II, and Nintendo Entertainment System).
They are designed to be able to support a wide variety of output formats, both to support multiple target platforms and to produce code for emulators.
The eventual goal of P65 is to be as expressive as the more powerful assemblers of the late 80s, such as DASM. Its not there yet, but its getting there.
Main features:
- Highly portable - All versions of P65 are written in portable scripting languages. The original releases were done in Perl. While P65-Perl 1.1 is stable and reasonably powerful, it lacks some major features, such as modules and macros. P65-Ophis, the Python port, will run on slightly fewer architectures, but will still run on all current major systems.
- Flexible output format - P65 allows for very flexible control over data and assemble points. Output file formats are completely independent of the final memory maps.
- Multiple file support - libraries may be kept as seperate files and included seperately, facilitating code reuse.
- Temporary label support - source may contain "anonymous labels" that help decrease namespace pollution. P65-Ophis also supports named temporary labels that only exist within a well-defined scope.
- Assemble-time expressions - P65-Ophis supports High-byte/low-byte computations along with bitmasking and traditional arithmetic operations in code and data statements. Access to the current PC is also supported. P65-Perls expressions are more limited but are generally sufficient.
- Symbol table management - Allows for creating labels and data constants outside of the code, and for allocating RAM symbolically. This includes full support for segments.
- Optimal instruction selection - Compresses as many instructions as possible into zero page format. If this compression permits other instructions to become zero page instructions, it will compress those as well.