kirakira PBR

installation.md

$ nasm kirakira_pbr.asm
$ sudo dd if=kirakira_pbr of=/dev/to/your/mbr/usb/partition bs=512 count=1

Use a USB memory which uses MBR (not UEFI).
dd rewrites your USB's PBR (boot loader); don't forget to save backup and play at your own risk!

kirakira_pbr.asm

  org 0x7c00
  jmp short entry
  nop
  times 0x3e - ($ - $$) db 0

entry:
  mov ax, 0
  mov ss, ax
  mov sp, 0x7c00
  mov ds, ax
  mov es, ax

  mov ax, 0x0013
  int 0x10

  mov bl, 0xf
  mov si, msg1
  call puts

  mov bl, 0xe
  mov si, msg2
  call puts

  mov bl, 0xd
  mov si, msg3
  call puts

  mov bl, 0xf
  mov si, msg4
  call puts

fin:
  hlt
  jmp fin

puts:
  mov al, [si]
  inc si
  cmp al, 0
  je puts_end
  mov ah, 0x0e
  mov bh, 0
  int 0x10
  jmp puts

puts_end:
  ret

msg1:
  db "ore ha ", 0

msg2:
  db "kirakira ", 0
  
msg3:
  db "kosen girl", 0

msg4:
  db "!!", 0

  times 510 - ($ - $$) db 0
  db 0x55, 0xaa