From 3f4c6c0559a95a49adf0ea6ca5de107fe7e59ad5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Juhani=20Krekel=C3=A4?= <juhani@krekelä.fi>
Date: Wed, 30 Jun 2021 23:22:09 +0300
Subject: [PATCH] Make output code work also on the original IBM PC

---
 bootsect.asm | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/bootsect.asm b/bootsect.asm
index e8e376f..7209d23 100644
--- a/bootsect.asm
+++ b/bootsect.asm
@@ -68,12 +68,13 @@ _start:
 	mov [drivenumber], dl
 
 select_os:
-	mov ah, 0xe
 	mov si, prompt
 	.print:
 		lodsb
 		test al, al
 		jz .end
+		; On the original IBM PC BIOS the int 0x10 will clobber this
+		mov ah, 0xe
 		int 0x10
 		jmp .print
 	.end: