Turbo Pascal v7.0

This program is a fairly simple graphical implementation but offers a lot in terms of understanding the graphics operational mechanism. The program displays a cluster of concentric circles in graphics mode and reproduces the "Flashing Device" screen illusion. Particular attention deserves the mathematical function that achieves the reproduction of the illusion.

This program is another implementation of the "Flashing Device" screen illusion and offers a lot in the direction of understanding the capabilities and the limitations of the graphics functions build-in to Turbo Pascal v7.0. The “spinal cord” of the program was implemented in pure Turbo Pascal v7.0. The program displays a cluster of concentric circles, large and small, in a Graphical User Interface (GUI)-like fashion, and that way the illusion is successfully reproduced on the screen. Particular attention in this case as well deserves the mathematical function that achieves the reproduction of the illusion.

This program implements a graphics mode, rotating and rolling around the horizontal axis, Banner with the addition this time of a focusing affect as well. To be achieved this required a radical change at the design of the program’s main core, which deserves a bit of addition study as it demonstrates effectively the skills and techniques required to achieve the focusing effect in a variety of other applications. The graphics procedures are again written primarily in Assembly language, while the remaining of the procedures were written in pure Turbo Pascal v7.0. The program can easily be extended in such as way as for the axis of motion to be the vertical axis, or alternatively to involve both axes at the same time.

The program is a second implementation of the “Game Intro” series of programs with some modifications in order to have faster rendering results and less percentage of memory allocated. In this case the program uses a different image but the algorithm itself is in general terms the same. The main graphics procedures are all written in Assembly, with those taking control of the management written in pure Turbo Pascal v7.0.

This program is another implementation of a graphics mode “Magnifier” application, including some radical improvements. The graphics routines are achieving a combination of higher response rates with a lower demand for allocating memory. The majority of these improvements are all about handling more efficiently details in display which are not very easy to detect with a naked eye but contribute significantly, both at the programming level and the consumption of processing resources.

This program is another implementation of an image file manipulation program. As a variant of the “Focusing Banner” program sets the image at the top of the screen in a folding manner. The program creates the final image to appear on the screen each time at first by using the “Video RAM” as a canvas only; thereby achieving faster response rates even when executed on low performance processors.

This program is a very simple implementation of famous “Plasma” illusion. The program uses two colours to form colour combinations for displaying purposes. A minimum amount of programming was done in Assembly language, with the bulk of the program to be implemented in pure Turbo Pascal v7.0. The program can be easily modified in order to produce more in number and richer in shape structures with more colour combinations.

Inspiration for the implementation of this program had originally been drawn from the famous by the same name Windows '95 Screen-saver. The difference in this case is that the "stars" can move not only towards the screen (giving the impression of forward tilt), but also in other directions (giving the pseudo-impression of freedom of movement). The program code achieves a faster execution rate in respect to the one achieved by its original like-named (the Windows ’95 Screen-saver), even when run on medium or low performance computer systems.

The program draws its design from the well-known Sci-fi movie “Star Wars”. Despite the fact that the implementation was done at its greatest percentage in pure Turbo Pascal v7.0, the program’s execution rate is a very good one even when the program is executed on very low in terms of computational power available computer systems. The words that appear on the titles screen can easily be changed from within the program to anything else.