From 3b7515a4ff5b1b3ae611e19a50995f5e26b27ecf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Miran=20Gr=C4=8Da?= <oubattler@gmail.com>
Date: Sun, 18 May 2025 09:11:13 +0200
Subject: [PATCH] Treat port 0x84, even if something is listening to it, as a
 delay port, fixes the Dell 466/NP on faster CPU's.

---
 src/io.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/io.c b/src/io.c
index 9554c971d..45dd4cb3d 100644
--- a/src/io.c
+++ b/src/io.c
@@ -445,10 +445,10 @@ outb(uint16_t port, uint8_t val)
         }
     }
 
-    if (!found) {
+    if (!found || (port == 0x84)) {
         cycles -= io_delay;
 #ifdef USE_DYNAREC
-        if (cpu_use_dynarec && ((port == 0xeb) || (port == 0xed)))
+        if (cpu_use_dynarec && ((port == 0x84) || (port == 0xeb) || (port == 0xed)))
             update_tsc();
 #endif
     }