From eced4725894ec99cc1611044409059f58f62de4d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pavel=20Kala=C5=A1=20=28Floxen=29?=
 <pavelkalas2048@seznam.cz>
Date: Sun, 12 Jul 2026 12:27:56 +0200
Subject: [PATCH] =?UTF-8?q?P=C5=99id=C3=A1na=20podpora=20Caps=20Lock=20v?=
 =?UTF-8?q?=20kl=C3=A1vesnicov=C3=A9m=20ovlada=C4=8Di=20a=20p=C5=99evod=20?=
 =?UTF-8?q?p=C3=ADsmen=20na=20velk=C3=A1?=
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---
 drivers/keyboard.c | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/drivers/keyboard.c b/drivers/keyboard.c
index cbf6287..07320d5 100644
--- a/drivers/keyboard.c
+++ b/drivers/keyboard.c
@@ -21,6 +21,21 @@ static char g_history[KBD_HISTORY_MAX][KBD_HISTORY_LINE_MAX];
 static int g_history_count = 0;
 static int g_history_head = 0;
 static int g_ctrl_down = 0;
+static int g_shift_down = 0;
+
+static char apply_letter_case(char c) {
+    int upper = g_shift_down;
+
+    if (!upper) {
+        return c;
+    }
+
+    if (c >= 'a' && c <= 'z') {
+        return (char)(c - ('a' - 'A'));
+    }
+
+    return c;
+}
 
 static inline unsigned char inb(unsigned short port) {
     unsigned char ret;
@@ -103,6 +118,16 @@ int keyboard_try_read_key(void) {
         return -1;
     }
 
+    if (sc == 0x2A || sc == 0x36) {
+        g_shift_down = 1;
+        return -1;
+    }
+
+    if (sc == 0xAA || sc == 0xB6) {
+        g_shift_down = 0;
+        return -1;
+    }
+
     if (sc & 0x80) {
         return -1;
     }
@@ -123,7 +148,7 @@ int keyboard_try_read_key(void) {
     }
 
     if (sc < 128 && keymap[sc]) {
-        out = keymap[sc];
+        out = apply_letter_case(keymap[sc]);
         return out;
     }