Implementation of Operating Systems - China DOS Union Forum

em07]Hehe, everyone, actually this is very simple! I remember when I first got in touch with computers, I always wanted to make an operating system! But no one taught me back then, and I was very depressed! But I didn't want everyone to keep being depressed like that, otherwise our operating system would never come out, hehe!
OK, now I'll tell you how to implement an operating system!
The first step, everyone's most confused thing might be how to implement a self-booting program?! Actually, the principle of self-booting is very simple. Write 55AA (hexadecimal) in the last 2 bytes of sector 1, track 0 of the floppy disk, and then write machine code in the preceding bytes, and then the computer will execute it! Note that when calling interrupts, don't call DOS soft interrupts, otherwise the computer will crash, because at this time we are independent of any operating system, and those interrupts we haven't filled in yet, hehe!
The second step, of course, is to design a disk file system format by yourself, so as to manage the disk! Beginners, pay attention! Folders are actually designed as pointers, because on the disk file system, folders are a dynamically changing structure, and each folder stores many pointers, pointing to the addresses of other files or folders!
Third, how to implement process calls! Actually, in real mode, it's very simple. You can get the machine code from the disk file, then load it into memory (remember the memory address at this time, including CS, IP), and then use the PUSH instruction and RET instruction, and the code will be loaded into memory. If it's not an illegal instruction, it will execute smoothly, hehe!
OK, the most important things of the operating system have been implemented, namely the file system and the process loader! Actually, these things have been implemented on my machine, but they are still very rudimentary, not as easy to use as DOS!
In fact, a lot of materials I found on the Internet, then read and did experiments, and finally designed by myself! Unfortunately, everything is implemented by myself, and there is no one to cooperate with me... Pain...

To obtain machine code, I'm using ULTRA EDIT! Actually, as long as you understand the MZ file format, it's okay! You can also use DEBUG, if you don't mind the trouble!

If that's the case, xy_god, it's a very simple thing for you to write a master boot record virus! In fact, some software such as "Return Genius" and multi-system booting and so on have rewritten the master boot record. First, move the content of the master boot record to another place, (or use a jump instruction to execute and then come back), execute your own code and then execute the code of the master boot record!

Actually, one of the motivations for me to learn these things back then was to make something like a virus or something!

If you make an operating system compatible with DOS, then you don't have to worry about "no one cooperating with me"...

Or it will be as difficult as the beginning of Unix.

Actually, it's almost impossible for one person to write an operating system!
I think xy_god is still at the stage of making houses to 30% in "Empire: Rise of Rome"!

Hehe, everyone should be interested in operating systems, and we can discuss together.
Also, the person above seems to like playing Empire, I wonder if they will play Conqueror.

有空到浩方对战平台,打一场阿!
http://www.cga.com.cn
我的名字是IkillGame
有空到浩方对战平台, have a match at HF Arena!
http://www.cga.com.cn
My name is IkillGame

Go ahead, go ahead. In this world, nothing is impossible (don't mind the person above ^_^). If there's anything you need help with, just let us know, everyone will definitely stand up for you!

Well, I'm currently writing a mouse driver. It's hard to find the writing materials and they're all in English, so I have to translate them myself!

I admire you and respect you

There is a book called "Write Your Own Operating System". I bought it. It's okay. I just don't have time to read it. I suggest everyone also go to the bookstore and flip through it.

The boot program is the easiest to handle, even I can do it!
The boot program of my computer was made by myself. There are installed on the computer:
MS-DOS 6.22
Windows 98
Windows XP
Fedora Core 2

Floor1　xy_god	Posted 2003-10-08 00:00
中级用户　Posts 56　Credits 276
em07]Hehe, everyone, actually this is very simple! I remember when I first got in touch with computers, I always wanted to make an operating system! But no one taught me back then, and I was very depressed! But I didn't want everyone to keep being depressed like that, otherwise our operating system would never come out, hehe! OK, now I'll tell you how to implement an operating system! The first step, everyone's most confused thing might be how to implement a self-booting program?! Actually, the principle of self-booting is very simple. Write 55AA (hexadecimal) in the last 2 bytes of sector 1, track 0 of the floppy disk, and then write machine code in the preceding bytes, and then the computer will execute it! Note that when calling interrupts, don't call DOS soft interrupts, otherwise the computer will crash, because at this time we are independent of any operating system, and those interrupts we haven't filled in yet, hehe! The second step, of course, is to design a disk file system format by yourself, so as to manage the disk! Beginners, pay attention! Folders are actually designed as pointers, because on the disk file system, folders are a dynamically changing structure, and each folder stores many pointers, pointing to the addresses of other files or folders! Third, how to implement process calls! Actually, in real mode, it's very simple. You can get the machine code from the disk file, then load it into memory (remember the memory address at this time, including CS, IP), and then use the PUSH instruction and RET instruction, and the code will be loaded into memory. If it's not an illegal instruction, it will execute smoothly, hehe! OK, the most important things of the operating system have been implemented, namely the file system and the process loader! Actually, these things have been implemented on my machine, but they are still very rudimentary, not as easy to use as DOS! In fact, a lot of materials I found on the Internet, then read and did experiments, and finally designed by myself! Unfortunately, everything is implemented by myself, and there is no one to cooperate with me... Pain...

Floor2　xy_god	Posted 2003-10-08 00:00
中级用户　Posts 56　Credits 276
To obtain machine code, I'm using ULTRA EDIT! Actually, as long as you understand the MZ file format, it's okay! You can also use DEBUG, if you don't mind the trouble!

Floor3　qb45	Posted 2003-10-09 00:00
高级用户　Posts 194　Credits 677
If that's the case, xy_god, it's a very simple thing for you to write a master boot record virus! In fact, some software such as "Return Genius" and multi-system booting and so on have rewritten the master boot record. First, move the content of the master boot record to another place, (or use a jump instruction to execute and then come back), execute your own code and then execute the code of the master boot record!

Floor4　xy_god	Posted 2003-10-10 00:00
中级用户　Posts 56　Credits 276
Actually, one of the motivations for me to learn these things back then was to make something like a virus or something!

Floor5　iceboy	Posted 2003-10-10 00:00
银牌会员　Posts 512　Credits 1,681
If you make an operating system compatible with DOS, then you don't have to worry about "no one cooperating with me"... Or it will be as difficult as the beginning of Unix.

Floor6　qb45	Posted 2003-10-10 00:00
高级用户　Posts 194　Credits 677
Actually, it's almost impossible for one person to write an operating system! I think xy_god is still at the stage of making houses to 30% in "Empire: Rise of Rome"!

Floor7　cn_archer	Posted 2003-10-11 00:00
元老会员　Posts 991　Credits 2,903　From 福建省
Hehe, everyone should be interested in operating systems, and we can discuss together. Also, the person above seems to like playing Empire, I wonder if they will play Conqueror.

Floor8　qb45	Posted 2003-10-13 00:00
高级用户　Posts 194　Credits 677
有空到浩方对战平台,打一场阿! http://www.cga.com.cn 我的名字是IkillGame 有空到浩方对战平台, have a match at HF Arena! http://www.cga.com.cn My name is IkillGame

Floor9　凌晨一点	Posted 2003-10-25 00:00
初级用户　Posts 54　Credits 255
Go ahead, go ahead. In this world, nothing is impossible (don't mind the person above ^_^). If there's anything you need help with, just let us know, everyone will definitely stand up for you!

Floor10　xy_god	Posted 2003-10-26 00:00
中级用户　Posts 56　Credits 276
Well, I'm currently writing a mouse driver. It's hard to find the writing materials and they're all in English, so I have to translate them myself!

Floor11　凌晨一点	Posted 2003-10-27 00:00
初级用户　Posts 54　Credits 255
Keep it up ^_^

Floor12　hunome	Posted 2003-10-27 00:00
银牌会员　Posts 721　Credits 2,265
Expert!

Floor13　lghseaman	Posted 2006-03-12 22:27
新手上路　Posts 5　Credits 18
I admire you and respect you

Floor14　hj_18	Posted 2006-03-14 07:32
中级用户　Posts 57　Credits 255
There is a book called "Write Your Own Operating System". I bought it. It's okay. I just don't have time to read it. I suggest everyone also go to the bookstore and flip through it.

Floor15　yk141	Posted 2006-03-17 13:18
初级用户　Posts 21　Credits 46　From 中华人民共和国
The boot program is the easiest to handle, even I can do it! The boot program of my computer was made by myself. There are installed on the computer: MS-DOS 6.22 Windows 98 Windows XP Fedora Core 2