ScrapExplorer - boot.s
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[FILE BEGIN]
1; SPDX-License-Identifier: GPL-3.0
2; Phoenix
3;
4; Main bootloader code
5;
6; COPYRIGHT NOTICE
7; Copyright (C) 2024 0x4248 and phoenix 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
14org 0x7C00
15bits 16
16
17start:
18    mov ah, 0x02      ; BIOS: Read floppy
19    mov al, 25         ; number of sectors to read
20    mov ch, 0         ; cylinder
21    mov cl, 2         ; sector
22    mov dh, 0         ; head
23    mov dl, 0x00      ; floppy drive
24    mov bx, 0x8000    ; memory address to load kernel
25    int 0x13
26    jc disk_error     ; if carry flag set, halt
27
28    ; Far jump to kernel
29    jmp 0x0000:0x8000
30
31disk_error:
32    hlt
33
34; Pad to 510 bytes
35times 510 - ($ - $$) db 0
36dw 0xAA55
37
[FILE END]
(C) 2025 0x4248
(C) 2025 4248 Media and 4248 Systems, All part of 0x4248
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