hello world

1 files changed, 21 insertions, 0 deletions

diff --git a/boot.asm b/boot.asm
index ddef7eb..b5c50cb 100644
--- a/boot.asm
+++ b/boot.asm
@@ -1,7 +1,28 @@
 ; yoinked from osdev.org
+mov ax, 0x07C0
+mov ds, ax
+
+mov si, msg
+cld
+
+ch_loop:
+  lodsb
+  ; hang if at null terminator
+  or al, al
+  jz hang
+
+  ; BIOS interrupt prints al
+  mov ah, 0x0E
+  mov bh, 0
+  int 0x10
+
+  jmp ch_loop
+
 hang:
     jmp hang
 
+msg db 'Hello World', 0
+
 times 510-($-$$) db 0 ; 2 bytes less now
 db 0x55
 db 0xAA