From 36fa4d965a1ce370d257339e48ef9165a1f22000 Mon Sep 17 00:00:00 2001
From: Peter Ross <pross@xvid.org>
Date: Wed, 15 Jan 2025 21:09:24 +1100
Subject: [PATCH] loader: manually enable a20 if 0x2401 fails

---
 loader/loader.asm | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/loader/loader.asm b/loader/loader.asm
index c60030a..3120c2c 100644
--- a/loader/loader.asm
+++ b/loader/loader.asm
@@ -14,11 +14,16 @@ start:
     mov ss, ax
     mov sp, 0x7c00
 
-%if 0
     mov ax, 0x2401
     int 0x15
-%endif
+    jnc .continue
+
+    cli
+    mov al, 2
+    out 0x92, al
+    sti
 
+.continue:
     mov si, zsetup
     call printz