Switching modes[ edit ] The processor runs in real mode immediately after power on, so an operating system kernelor other program, must explicitly switch to another mode if it wishes to run in anything but real mode. Switching modes is accomplished by modifying certain bits of the processor's control registers after some preparation, and some additional setup may be required after the switch. In general, the features of the modern x86 instruction set are:
Before we start programming we should probably ask ourselves two questions: It's pretty obvious why you'd want to program demos; because it's fun.
You get all the usual advantages of doing programming, that you're learning about programming and that it's fun. You also get the added advantage that the resulting programs are cool and nice to look at if you're good at it. And of course, demos is more fun than most other things you can program.
Another good thing about programming demos is that you'll learn about many different aspects of the computer, at a very low level.
To get good performance which is very important in demosyou need to write efficient code, and the only way to do that is to bang directly on the hardware. You don't use any kind of libraries or abstractions when you program demos, you do it all the hard way.
So you need to understand how you make graphics appear on the screen, music to be heard from the speakers and how to load stuff from disk. You also need to use interrupts, which is something you really need to know about if you're ever going to write an operating system.
It is also one of the things that is considered to be difficult to understand. Don't let that scare you, though, it's a pretty easy principle to understand, and as soon as you've gotten it to work once, you can probably do it much more easily the next time. All in all, in coding demos you learn how a computer works at a very fundamental level, and understanding that makes lots of other things in programming easier.
I'll just take one example: Well, if you've written some machine code programs you know what pointers are and that they're not dangerous 1. Why C The second question I posed above was why you'd want to program your demos on a C There are numerous very good reasons why you should use a C, some of which are applicable to some other hardware platforms as well, and some which aren't.
I'll list some of my favourite reasons here. It's a very nice processor to program. It has a simple instruction set, so it's easy to get started. It has been studied a lot and there's lots of documentation available. Of course, the only has three registers not counting the PC, SP and Status registerwhich can make it a pain in the ass to implement complicated algorithms on, but on the other hand, it sure makes you appreciate a modern RISC processor with dozens of general-purpose registers.
The VIC has a lot of interesting bugs or features, depending on how you look at itwhich means you can create amazing effects that are unique to the C It's all about learning about the hardware and learning how to use it to fit your needs, not just blindly following a specification document.
Most of these effects are achieved through well-timed modifications of VIC registers. That's one of the things are most important in demo program: Creating raster bars on the Amiga is easy: It's Old and Slow That the C is old and slow might not sound like much of an advantage, but when it comes to demo programming, it is.x86 assembly language is a family of backward-compatible assembly languages, which provide some level of compatibility all the way back to the Intel introduced in April x86 assembly languages are used to produce object code for the x86 class of processors.
Like all assembly languages, it uses short mnemonics to represent the fundamental instructions that the CPU in a computer can.
Yes, most times. First of all you start from wrong assumption that a low-level language (assembly in this case) will always produce faster code than high-level language (C++ and C in this case).
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It doesn't make sense to me writing a machine code translator for a low level language in a higher level language. Let's say we have created a brand new microprocessor architecture that there is not even a C compiler for that architecture. Puterman [email protected] aka Linus Åkerlund.
Contents. Contents; Introduction. What is this Document About? Why Did I Write This Document? Contributors. C# In Memory Assembly to DLL File.
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