; boot.asm - A simple bootloader example
[bits 16]          ; Set to 16-bit mode
[org 0x7C00]      ; BIOS loads the bootloader at this address

start:
    ; Clear screen
    mov ax, 0x0003   ; Set video mode to 3 (80x25 color text)
    int 0x10        ; BIOS interrupt to set video mode

    ; Print "Hello, World!"
    mov si, hello_message ; Load address of the message into SI
    call print_string   ; Call function to print the string

    ; Hang the system (infinite loop)
hang:
    jmp hang           ; Jump to hang indefinitely

; Function to print a string
print_string:
    mov ah, 0x0E      ; BIOS teletype output function
.next_char:
    lodsb             ; Load byte at DS:SI into AL and increment SI
    cmp al, 0         ; Check for null terminator
    je .done          ; If null, we are done
    int 0x10         ; Call BIOS to print character in AL
    jmp .next_char   ; Repeat for next character
.done:
    ret               ; Return from function

; Data section
hello_message db 'Hello, World!', 0  ; Null-terminated string

; Bootloader signature (must be present)
times 510 - ($ - $$) db 0   ; Fill the rest of the sector with zeros
dw 0xAA55                   ; Boot signature