From 4284f155747e944e902bc7be34ebfe6e7fab1617 Mon Sep 17 00:00:00 2001
From: Akamaki <97360908+akmed772@users.noreply.github.com>
Date: Fri, 20 Feb 2026 09:03:45 +0900
Subject: [PATCH] Keyboard: Fix a bug in IBM 5576-001 emulation

Fix a bug that the make code is sent when the 5576-001 emulation is enabled and the key is released.
---
 src/device/keyboard.c | 28 +++++++++++++++-------------
 1 file changed, 15 insertions(+), 13 deletions(-)

diff --git a/src/device/keyboard.c b/src/device/keyboard.c
index e77a5fc1d..ea8bcc1e7 100644
--- a/src/device/keyboard.c
+++ b/src/device/keyboard.c
@@ -216,22 +216,24 @@ key_process(uint16_t scan, int down)
     */
     if (key5576mode) {
         int i = 0;
-        if (!down) {
-            /* Do and exit the 5576-001 emulation when a key is pressed other than trigger keys. */
-            if (scan != 0x1d && scan != 0x2a && scan != 0x138)
-            {
+        if (down) {
+            while (scconv55_8a[i].sc != 0) {
+                if (scconv55_8a[i].sc == scan) {
+                    while (scconv55_8a[i].mk[c] != 0)
+                        keyboard_send(scconv55_8a[i].mk[c++]);
+                }
+                i++;
+            }
+        }
+        /* Do and exit the 5576-001 emulation when a key is pressed other than trigger keys. */
+        if (scan != 0x1d && scan != 0x2a && scan != 0x138) {
+            if (!down) {
                 key5576mode = 0;
                 kbc_at_log("5576-001 key emulation disabled.\n");
             }
-        }
-        while (scconv55_8a[i].sc != 0)
-        {
-            if (scconv55_8a[i].sc == scan) {
-                while (scconv55_8a[i].mk[c] != 0)
-                    keyboard_send(scconv55_8a[i].mk[c++]);
-                return;
-            }
-            i++;
+            /* If the key is found in the table, the scancode has been sent.
+               Or else, do nothing. */
+            return;
         }
     }