From 8e482db009467dc7b9519c67d4576cd223f3a9ae Mon Sep 17 00:00:00 2001
From: WNT50 <173389620+WNT50@users.noreply.github.com>
Date: Wed, 1 Oct 2025 22:11:42 +0800
Subject: [PATCH] Fix BIOS loading address of IBM PS/2 ESDI adapter (#6262)

---
 src/disk/hdc_esdi_mca.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/disk/hdc_esdi_mca.c b/src/disk/hdc_esdi_mca.c
index 78a2f3183..b3c33675a 100644
--- a/src/disk/hdc_esdi_mca.c
+++ b/src/disk/hdc_esdi_mca.c
@@ -1220,6 +1220,12 @@ esdi_mca_write(int port, uint8_t val, void *priv)
 
     if (!(dev->pos_regs[3] & 8)) {
         switch (dev->pos_regs[3] & 7) {
+            case 0:
+                dev->bios = 0xc0000;
+                break;
+            case 1:
+                dev->bios = 0xc4000;
+                break;
             case 2:
                 dev->bios = 0xc8000;
                 break;