ScrapExplorer - boot.asm
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[FILE BEGIN]
1; SPDX-License-Identifier: GPL-3.0
2; x86bootdisk
3;
4; boot.asm
5;
6; COPYRIGHT NOTICE
7; Copyright (C) 2024-2025 0x4248 and contributors
8; Redistribution and use in source and binary forms, with or without
9; modification, are permitted provided that the license is not changed.
10; 
11; This software is free and open source. Licensed under the GNU general
12; public license version 3.0 as published by the Free Software Foundation.
13 
14[ORG 0x7c00]
15[BITS 16]
16jmp start               ; Jump to start
17
18start:  
19    ; Sertting up the stack
20    xor ax, ax           ; clear ax
21    mov ds, ax           ; set ds to 0
22    cld                  ; clear direction flag
23   
24    mov si, boot_msg     ; set si to msg
25    call bios_print      ; call bios_print
26    jmp bios_print       ; jump to bios_print
27    hlt                  ; halt the system
28
29
30
31bios_print:
32    lodsb                ; load byte from si to al
33    or al, al            ; check if al is 0
34    jz done              ; if al is 0, jump to done
35    mov ah, 0x0E          ; set teletype output
36    mov bh, 0            ; set page number
37   
38    int 0x10             ; call bios interrupt
39    jmp bios_print       ; jump to bios_print
40
41done:
42    ret
43
44boot_msg db 'Booted!', 0
45
46times 510-($-$$) db 0   ; Fill the rest of the sector with 0
47db 0x55                 ; Boot signature
48db 0xaa                 ; Boot signature
49
[FILE END]
(C) 2025 0x4248
(C) 2025 4248 Media and 4248 Systems, All part of 0x4248
See LICENCE files for more information. Not all files are by 0x4248 always check Licencing.