Now, I may have made this a bit too complicated. A fair question to ask at this stage is what an interrupt is. What we do is that we increment the border colour, jump to the music play routine, which executes and returns, and then we decrement the border colour and jump back to the main loop.
This might change, of course. The most important features are a fast loader an a monitor. I find it to be a very clean and nice way of getting a stable raster, without all the hassle of using the double interrupts method. As these registers can only store one byte each, you can only set coordinates between 0 and The idea of crafting a language of patterns to describe open-ended solutions to problems comes from A Pattern Languageby Christopher Alexander along with Sarah Ishikawa and Murray Silverstein.
To start a program, you simply jump directly it, using the g command, eg.: For now, it should be sufficient to know that there are ways to make the raster completely stable. And of course, demos is more fun than most other things you can program.
Then we have to restore the register contents from the stack these are stored there when the interrupt occursand then execute the instruction RTI, which returns from the interrupt. If we forget to do this, the interrupt will be triggered again, right after we return from this interrupt code.
By using different registers to count the times you do the loop and to index into the colour table, you can make the colours in the raster bar roll.
And of course, after you have cleared the screen, you can just jump to some other routine, like eg.
That gives you more flexibility, of course. At a later stage, you might be interested in finding out what the individual bits of those registers do. Packers use run-length encoding RLEwhich is a simple compression technique. Each of the chapters in this book is an independent idea that you can apply to your code.
You can find source code and more details about some of these effects, and others as well, in early issues of Commodore Hacking and all three issues of Coders World see the References section below. However, you can do stuff like opening the top and bottom border, sprite multiplexers, raster bars, scrollers, displaying FLI pictures, FLD and all kinds of stuff without having a stable raster.
The same goes for the side border. But if addr is eg. That way, no new NMIs can occur. This might be a bit tricky the first time you try to do it, but all you really have to do is to set up two tables, one for the X coordinates and one for the Y coordinates, and assign each sprite an offset into the tables.
How do you do this?
By changing the X-scroll value in an ordered manner, you can make the graphics wave back and forth. When written, it is used to set the number of the line where the next raster interrupt will occur.
A trick that is often used, to optimize all sorts of plotter routines, is to use a 16x16 chars area, where the first column has the chars 0, 1, 2, 3 etc.Tutorials and Lecture Notes: Introduction to Computer Science using Java.
Lecture Notes on Java Programming.; Introduction to Assembly Language. Lecture Notes on MIPS assembly programming.; Vector Math Tutorial for Computer Graphics.
Introduction to WPF in Visual Studio. 01/26/; 2 minutes to read Contributors. all; In this article. Windows Presentation Foundation (WPF) in Visual Studio provides developers with a unified programming model for building.
The Official Guide to Learning OpenGL, Version About This Guide; Chapter 1. Introduction to OpenGL; Chapter 2. State Management and Drawing Geometric Objects. Introduction Game Programming Patterns. In fifth grade, my friends and I were given access to a little unused classroom housing a couple of very beat-up TRSs.
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