instructions
1. save my code to a file named c\boot.asm 2. assemble with nasm, nasm -f boot.asm -o boot.bin 3. write to disk on macos, dd=if~/Desktop/example/boot.bin of=~/my-VMs/a.img bs=512b
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Showing posts from July, 2023
this is more what a bare boot sector should look like, just add code in the right spots.
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use32 start: jmp code; db 0 'dreamos '; dw 512; ;bytes per sector db 2 ;sectors per cluster dw 0 ;reserved sectors db 1 ;fats on disk dw 1 ;root directory entries dw 20 ;total sectors db 11111110b ;media desciptor dw 20 ;sectors per fat dw 1 ;sectors per track dw 2 ;heads dw 0 ;hidden sectors dd 0; db 0; drive number db 0; db 29h; dd 1; db 'dreamos '; db 0,0,0,0,0,0,0,0; code: jmp real_start our_section: db 0080 ;our section real_start: jmp lets_exit; try_again: ;base equ $-start base2 equ 510-$; after_code: db base2 dup (0); db 0x55; db 0xaa; next_sector: jmp b_next_sector; blah_sig: db 'Nick'; b_next_sector: base3 equ 1024-$; db base3 dup (?); lets_exit;