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by using "CLOAD" for a BASIC program).The World of CD-i is the official tester of the CD-i Emulator. Using File->Export->To audio playback the data is played back as waveform on the default audio device and can be loaded on the G7400 (e.g. extracting data from the emulated environment in the clipboard buffer as text to be used in other applicationsĪfter powering up and loading the application on your PC, any of the sample programs can be either imported from audio files or from native data (e.g.copying data from the clipboard as keypresses in the emulated environment.extracting data from the emulated environment (saving programs to a simulated tape).injecting data into the emulated environment (loading programs from a simulated tape).replaying this log to the emulator, providing the same input at the same executed cycle time (including taking screenshots and ending the emulation once the log finishes)Īdditionally the following features for digital preservation where implemented in the home computer version of the emulation:.recording of a log of input to the environment (all data inputs including actions taken in the emulator like recording a screenshot of the current state).
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To evaluate the rendering of O2EM we implemented the following features: Pictures below show a Philips G7400+C7420 Home Computer Module (left), and a collection of original tapes used to store computer programs for the system (right). Results of renderings were output on a tv-screen and sound through the speakers of the tv-set. Video games for the system were provided in cartridge form and the possible types of inputing data into the system were keypresses using the keyboard and joystick input using one of the two joysticks. Besides BASIC programs screenshots, arrays, strings, and memory dumps could be saved on tape using the BASIC command "CSAVE" in various forms.
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The BASIC-programming language for the C7420 allowed the storage of different kinds of data on standard audio tapes by providing connector cables to the headphone and microphone plugs of standard audio systems. With an add-on cartridge, the C7420 Home Computer Module that was also released in 1983 the Philips G7400 could be converted to a home computer programmable in Microsoft BASIC. It was the successor to the Philips Videopac/Magnavox Odyssey2 which was sold in Europe and the US since 1978. The Philips Videopac+ G7400 was a video game console system released in Europe in 1983. Philips Videopac G7000/Philips Videopac+ G7400/C7420 Basic Module To evaluate how this could be implemented in complex rendering environments, we took an emulator for a rather simple homecomputer system and extended it with features necessary for evaluation. Most emulators today do not support extracting information about the rendering nor feeding data into the environment at certain points in the rendering.
Philips cd i emulator mac manual#
This inlcudes both manual user input but also any other external data (network, files, etc.). This makes it necessary to provide always the same external data to the environment for every evaluation-rendering of an object. To make the rendering comparable, we have to make sure that the object is rendered under the exact same conditions, too remove the possibility of side-effects in the rendering resulting from object behaviour instead of changes in the rendering environment. As this is not possible for emulation environments (where the digital object remains unchanged), we have to extract information about the rendering from the environment. When digital objects are migrated to a different format, the significant properties before and after the migration are usually compared to check for differences in the rendering. This creates the necessity to evaluate the results of digital preservation actions involving emulators, to make sure that renderings of digital objects stay true to the original once they are replayed at a later point in time. Emulation is one of the main strategies for preserving digital objects.