From aaaddb1d77c55e332aef765f323d2162140ff841 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Roc=20Vall=C3=A8s=20Dom=C3=A8nech?= <vallesroc@gmail.com>
Date: Wed, 6 Oct 2021 07:23:57 +0900
Subject: [PATCH] optromloader.asm: Comment on why ES needs to be initialized
 to zero.

---
 optromloader.asm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/optromloader.asm b/optromloader.asm
index 2597682..2bce744 100644
--- a/optromloader.asm
+++ b/optromloader.asm
@@ -29,7 +29,7 @@ start:
 	mov sp,$7C00 ;set a stack right under the bootloader
 	sti ;re-enable interrupts from 8086/86 workaround
 	mov ds,ax ;DS can't be trusted either
-	mov es,ax ;ES isn't any more trustworthy
+	mov es,ax ;ES isn't any more trustworthy, and is used by readblock below
 	mov si,banner_str
 	call printstr
 	;*** Load first block of ROM image (containing ROM header)