[Infamia]

OS (Click to View)

Code

BITS 16

start:
    mov ax, 07C0h ; SET UP STACK
    mov ss, ax
    mov sp, 4096
    sub ax, 512
    mov ds, ax
main:
    xor ah, ah ; MAKE REGISTER AH 0
    int 16h ; GET KEYBOARD INPUT (one key)
    cmp ah, 50h ; BIOS SCANCODE FOR DOWN ARROW
    je down ; GO TO LABEL DOWN
    cmp ah, 48h ; COMPARE BIOS SCANCODE OF KEY TO THAT OF UP ARROW
    je up ; JUMP TO UP LABEL LATER IN CODE
    cmp ah, 4Bh ; AND SO ON
    je left
    cmp ah, 4Dh
    je right
    mov ah, 0Eh ; AFTER USERINPUT IS CALLED, ASCII CODE IS PLACED IN AL
    int 10h ; CALL INTERRUPT AND PRINT ASCII CODE FROM KEYBOARD
    cmp al, 10 ; www .asciitable. com
    je newline
    cmp al, 13
    je newline
    cmp al, 8
    je backspace
    cmp al, 27
    je shutdown
    cmp al, 96
    je sshutdown
    jmp main
newline:
    mov al, 13 ; MAKE A CR/LF
    int 10h
    mov al, 10
    int 10h
    jmp main
down:
    mov ah, 0Fh ; MOVE POINTER DOWN
    int 10h
    mov ah, 03h
    int 10h
    inc dh
    mov ah, 2
    int 10h
    jmp main
up:
    mov ah, 0Fh ; MOVE POINTER UP
    int 10h
    mov ah, 03h
    int 10h
    dec dh
    mov ah, 2
    int 10h
    jmp main
left:
    mov ah, 0Fh ; MOVE LEFT
    int 10h
    mov ah, 03h
    int 10h
    dec dl ; I COULD'VE JUST DONE A BACKSPACE BUT IT WOULD HAVE DELETED USER TEXT
    mov ah, 2
    int 10h
    jmp main
right:
    mov ah, 0Fh ; MOVE POINTER RIGHT
    int 10h
    mov ah, 03h
    int 10h
    inc dl
    mov ah, 2
    int 10h
    jmp main
backspace:
    mov al, 0 ; MOVE A NULL WHICH DELETES CURRENT CHARACTER
    int 10h
    mov al, 8 ; THEN MAKE A SPACE SINCE NOW THE CHARACTER BEFORE IT IS SELECTED
    int 10h
    jmp main ; GO  BACK TO MAIN
shutdown:
    int 20h ; full shutdown
sshutdown:
    int 19h ; restart
    
times 510-($-$$) db 0
dw 0AA55h ; BOOTLOADER SIGNATURE AT END OF SECTOR
times 1474560-($-$$) db 0 ; FILL FILE WITH 1440KB OF DATA  SO IT CAN BECOME A VALID FLOPPY

Build File (PYTHON) (Click to View)

Code

import os, sys
cmd = "nasm -o " + sys.argv[1] + " -f bin " + sys.argv[1]
os.system("cls")
os.system("color 1f")

while True:
    os.system(cmd)
    print("complete...")
    opt = raw_input("Compile again? ").lower()
    sys.exit() if opt == "no" else True

BAT Exec (Click to View)

Code

@echo off
nasm -o _os.flp -f bin _os.asm

It isn't much, but it could be used for learning- it's written in pure NASM with-out any macros or C functions, so this can be just run under DOSBox with certain commands to build it to be so. But this does require prerequisites for it to work, one- being Python- is optional, and the other- NASM- isn't so optional unless you've found a way of building it manually.

Save the Assembly file as something like _os.asm (so it is at the top of the directory listing- usually) and the Python file under _build.py or something of the likes. If you cannot afford to download Python, then simply save the .bat as something like _build.bat and run it. (I don't know the equivalent for Linux, but it should be the same as calling NASM and just selecting the file)

This is a floppy file, so if you run it in Virtual Box or so; if any additions of code plus over 1440KB, you will encounter an error; thus you'll need to run it in QEMU as as far as I know, Virtual Box doesn't support plain binary formats. So just simply add an instruction in the Python file which calls qemu-system-i386 -fda _os.bin/flp (thus you'll need to have qemu installed, which isn't that big of a file.

My Github is at: https :// github .com/unazed/OS1 if you want to see older versions (or however Github works) or commit code. Thanks for reading.

Here's a picture of it being run in QEMU

imgur .com/GKdJcoK.png

[Malicious Intent]

Well done man. I hope you will develop this project into something bigger over the time. Good luck

[Infamia]

Well done man. I hope you will develop this project into something bigger over the time. Good luck

Thanks, I've commented the code since somebody on Discord suggested that people trying to read it might be baffled. I do plan on adding integration with languages like D or C later on, but I think I should make it a shell first. But nonetheless thanks for your post, my friend said people here would embarrass me or something ;)

[Malicious Intent]

Thanks, I've commented the code since somebody on Discord suggested that people trying to read it might be baffled. I do plan on adding integration with languages like D or C later on, but I think I should make it a shell first. But nonetheless thanks for your post, my friend said people here would embarrass me or something ;)

Lol don't listen to your friend haha.. Yeah shell would be nice for sure. Its nice to see projects with big potential just taking of. As i said i hope you will continue to develop this. Bright future ahead buddy.

[Infamia]

Lol don't listen to your friend haha.. Yeah shell would be nice for sure. Its nice to see projects with big potential just taking of. As i said i hope you will continue to develop this. Bright future ahead buddy.

Oh God, I've just fallen into the problem of running out of space in the sector; I've written the shell already but I can't fit the most vital 2 bytes into there which signifies that it's actually bootable and an OS, I guess I'll have to write a bootloader first.

[Malicious Intent]

Oh God, I've just fallen into the problem of running out of space in the sector; I've written the shell already but I can't fit the most vital 2 bytes into there which signifies that it's actually bootable and an OS, I guess I'll have to write a bootloader first.

Lol .. there you go... you will probably run into many problems like this but by the time you done with them you will have nice lil functional OS..

[Infamia]

Lol .. there you go... you will probably run into many problems like this but by the time you done with them you will have nice lil functional OS..

True man, I hope the rest of Hackforums is mostly like you, thusfar I've posted a few times in Lounge and I think the people are kind of nice but prone to getting mad at something annoying. I will try to keep the OS in on or two files however since I hate switching back and forth files, with the exception of build files of course.

[Malicious Intent]

Well ill be following this development..

[Venom0]

Hey, nice work. I also have some experience with this. Have you planned on adding support for protected mode and memory segmentation? It would allow you to put in your shell. I could help you with that.

[Infamia]

Hey, nice work. I also have some experience with this. Have you planned on adding support for protected mode and memory segmentation? It would allow you to put in your shell. I could help you with that.

this idea is quite gone, sorry.

i'm learning more c/++ so i can cross-compile it later with the assembly and make an actual OS rather than a text editor with protected mode and all the other neat shit.

[_L0cky_]

this idea is quite gone, sorry.

i'm learning more c/++ so i can cross-compile it later with the assembly and make an actual OS rather than a text editor with protected mode and all the other neat shit.

Such a great post, it's a pity you're no longer into this.