diff --git a/csi.c b/csi.c
index 3b6f8896..daecba47 100644
--- a/csi.c
+++ b/csi.c
@@ -319,7 +319,7 @@ csi_dispatch(struct terminal *term, uint8_t final)
             for (size_t i = 0; i < term->vt.params.idx; i++) {
                 switch (term->vt.params.v[i].value) {
                 case 1:
-                    LOG_WARN("unimplemented: smkx");
+                    term->decckm = DECCKM_SS3;
                     break;
 
                 case 1049:
@@ -344,7 +344,7 @@ csi_dispatch(struct terminal *term, uint8_t final)
             for (size_t i = 0; i < term->vt.params.idx; i++) {
                 switch (term->vt.params.v[i].value) {
                 case 1:
-                    LOG_WARN("unimplemented: rmkx");
+                    term->decckm = DECCKM_CSI;
                     break;
 
                 case 1049:
diff --git a/input.c b/input.c
index 34b8cf73..5e61d49b 100644
--- a/input.c
+++ b/input.c
@@ -76,70 +76,70 @@ struct keymap {
 static const struct keymap key_map[][2] = {
     [XKB_KEY_Up] = {
         {"[A", "[1;2A", "[1;3A", "[1;4A", "[1;5A", "[1;6A", "[1;7A", "[1;8A"},
-        {}},
+        {"OA", "[1;2A", "[1;3A", "[1;4A", "[1;5A", "[1;6A", "[1;7A", "[1;8A"}},
     [XKB_KEY_Down] = {
         {"[B", "[1;2B", "[1;3B", "[1;4B", "[1;5B", "[1;6B", "[1;7B", "[1;8B"},
-        {}},
+        {"OB", "[1;2B", "[1;3B", "[1;4B", "[1;5B", "[1;6B", "[1;7B", "[1;8B"}},
     [XKB_KEY_Right] = {
         {"[C", "[1;2C", "[1;3C", "[1;4C", "[1;5C", "[1;6C", "[1;7C", "[1;8C"},
-        {}},
+        {"OC", "[1;2C", "[1;3C", "[1;4C", "[1;5C", "[1;6C", "[1;7C", "[1;8C"}},
     [XKB_KEY_Left] = {
         {"[D", "[1;2D", "[1;3D", "[1;4D", "[1;5D", "[1;6D", "[1;7D", "[1;8D"},
-        {}},
+        {"OD", "[1;2D", "[1;3D", "[1;4D", "[1;5D", "[1;6D", "[1;7D", "[1;8D"}},
     [XKB_KEY_Home] = {
         {"[H", "[1;2H", "[1;3H", "[1;4H", "[1;5H", "[1;6H", "[1;7H", "[1;8H"},
-        {}},
+        {"OH", "[1;2H", "[1;3H", "[1;4H", "[1;5H", "[1;6H", "[1;7H", "[1;8H"}},
     [XKB_KEY_End] = {
         {"[F", "[1;2F", "[1;3F", "[1;4F", "[1;5F", "[1;6F", "[1;7F", "[1;8F"},
-        {}},
+        {"OF", "[1;2F", "[1;3F", "[1;4F", "[1;5F", "[1;6F", "[1;7F", "[1;8F"}},
     [XKB_KEY_Insert] = {
         {"[2~", "[2;2~", "[2;3~", "[2;4~", "[2;5~", "[2;6~", "[2;7~", "[2;8~"},
-        {}},
+        {"[2~", "[2;2~", "[2;3~", "[2;4~", "[2;5~", "[2;6~", "[2;7~", "[2;8~"}},
     [XKB_KEY_Delete] =  {
         {"[3~", "[3;2~", "[3;3~", "[3;4~", "[3;5~", "[3;6~", "[3;7~", "[3;8~"},
-        {}},
+        {"[3~", "[3;2~", "[3;3~", "[3;4~", "[3;5~", "[3;6~", "[3;7~", "[3;8~"}},
     [XKB_KEY_Page_Up] = {
         {"[5~", "[5;2~", "[5;3~", "[5;4~", "[5;5~", "[5;6~", "[5;7~", "[5;8~"},
-        {}},
+        {"[5~", "[5;2~", "[5;3~", "[5;4~", "[5;5~", "[5;6~", "[5;7~", "[5;8~"}},
     [XKB_KEY_Page_Down] = {
         {"[6~", "[6;2~", "[6;3~", "[6;4~", "[6;5~", "[6;6~", "[6;7~", "[6;8~"},
-        {}},
+        {"[6~", "[6;2~", "[6;3~", "[6;4~", "[6;5~", "[6;6~", "[6;7~", "[6;8~"}},
     [XKB_KEY_F1] = {
         {"OP", "[1;2P", "[1;3P", "[1;4P", "[1;5P", "[1;6P", "[1;7P", "[1;8P"},
-        {}},
+        {"OP", "[1;2P", "[1;3P", "[1;4P", "[1;5P", "[1;6P", "[1;7P", "[1;8P"}},
     [XKB_KEY_F2] = {
         {"OQ", "[1;2Q", "[1;3Q", "[1;4Q", "[1;5Q", "[1;6Q", "[1;7Q", "[1;8Q"},
-        {}},
+        {"OQ", "[1;2Q", "[1;3Q", "[1;4Q", "[1;5Q", "[1;6Q", "[1;7Q", "[1;8Q"}},
     [XKB_KEY_F3] = {
         {"OR", "[1;2R", "[1;3R", "[1;4R", "[1;5R", "[1;6R", "[1;7R", "[1;8R"},
-        {}},
+        {"OR", "[1;2R", "[1;3R", "[1;4R", "[1;5R", "[1;6R", "[1;7R", "[1;8R"}},
     [XKB_KEY_F4] = {
         {"OS", "[1;2S", "[1;3S", "[1;4S", "[1;5S", "[1;6S", "[1;7S", "[1;8S"},
-        {}},
+        {"OS", "[1;2S", "[1;3S", "[1;4S", "[1;5S", "[1;6S", "[1;7S", "[1;8S"}},
     [XKB_KEY_F5] = {
         {"[15~", "[15;2~", "[15;3~", "[15;4~", "[15;5~", "[15;6~", "[15;7~", "[15;8~"},
-        {}},
+        {"[15~", "[15;2~", "[15;3~", "[15;4~", "[15;5~", "[15;6~", "[15;7~", "[15;8~"}},
     [XKB_KEY_F6] = {
         {"[17~", "[17;2~", "[17;3~", "[17;4~", "[17;5~", "[17;6~", "[17;7~", "[17;8~"},
-        {}},
+        {"[17~", "[17;2~", "[17;3~", "[17;4~", "[17;5~", "[17;6~", "[17;7~", "[17;8~"}},
     [XKB_KEY_F7] = {
         {"[18~", "[18;2~", "[18;3~", "[18;4~", "[18;5~", "[18;6~", "[18;7~", "[18;8~"},
-        {}},
+        {"[18~", "[18;2~", "[18;3~", "[18;4~", "[18;5~", "[18;6~", "[18;7~", "[18;8~"}},
     [XKB_KEY_F8] = {
         {"[19~", "[19;2~", "[19;3~", "[19;4~", "[19;5~", "[19;6~", "[19;7~", "[19;8~"},
-        {}},
+        {"[19~", "[19;2~", "[19;3~", "[19;4~", "[19;5~", "[19;6~", "[19;7~", "[19;8~"}},
     [XKB_KEY_F9] = {
         {"[20~", "[20;2~", "[20;3~", "[20;4~", "[20;5~", "[20;6~", "[20;7~", "[20;8~"},
-        {}},
+        {"[20~", "[20;2~", "[20;3~", "[20;4~", "[20;5~", "[20;6~", "[20;7~", "[20;8~"}},
     [XKB_KEY_F10] = {
         {"[21~", "[21;2~", "[21;3~", "[21;4~", "[21;5~", "[21;6~", "[21;7~", "[21;8~"},
-        {}},
+        {"[21~", "[21;2~", "[21;3~", "[21;4~", "[21;5~", "[21;6~", "[21;7~", "[21;8~"}},
     [XKB_KEY_F11] = {
         {"[23~", "[23;2~", "[23;3~", "[23;4~", "[23;5~", "[23;6~", "[23;7~", "[23;8~"},
-        {}},
+        {"[23~", "[23;2~", "[23;3~", "[23;4~", "[23;5~", "[23;6~", "[23;7~", "[23;8~"}},
     [XKB_KEY_F12] = {
         {"[24~", "[24;2~", "[24;3~", "[24;4~", "[24;5~", "[24;6~", "[24;7~", "[24;8~"},
-        {}},
+        {"[24~", "[24;2~", "[24;3~", "[24;4~", "[24;5~", "[24;6~", "[24;7~", "[24;8~"}},
     };
 
 static void
@@ -194,11 +194,10 @@ keyboard_key(void *data, struct wl_keyboard *wl_keyboard, uint32_t serial,
             "effective=0x%08x",
             sym, mods, consumed, significant, effective_mods);
 
-    const int mode = 0; /* ~App */
     if (sym < sizeof(key_map) / sizeof(key_map[0]) &&
-        key_map[sym][mode].normal != NULL)
+        key_map[sym][term->decckm].normal != NULL)
     {
-        const struct keymap *key = &key_map[sym][mode];
+        const struct keymap *key = &key_map[sym][term->decckm];
         const char *esc = NULL;
 
         if (effective_mods == 0)
diff --git a/main.c b/main.c
index f773d428..b0db319a 100644
--- a/main.c
+++ b/main.c
@@ -666,6 +666,8 @@ main(int argc, const char *const *argv)
         .quit = false,
         .term = {
             .ptmx = posix_openpt(O_RDWR | O_NOCTTY),
+            .decckm = DECCKM_CSI,
+            .keypad_mode = KEYPAD_NUMERICAL,  /* TODO: verify */
             .vt = {
                 .state = 1,  /* STATE_GROUND */
             },
diff --git a/terminal.h b/terminal.h
index fa6623ef..002739f1 100644
--- a/terminal.h
+++ b/terminal.h
@@ -68,16 +68,20 @@ struct grid {
     tll(struct damage) damage;
 };
 
+struct vt_subparams {
+    unsigned value[16];
+    size_t idx;
+};
+
+struct vt_param {
+    unsigned value;
+    struct vt_subparams sub;
+};
+
 struct vt {
     int state;  /* enum state */
     struct {
-        struct {
-            unsigned value;
-            struct {
-                unsigned value[16];
-                size_t idx;
-            } sub;
-        } v[16];
+        struct vt_param v[16];
         size_t idx;
     } params;
     struct {
@@ -116,9 +120,14 @@ struct kbd {
     } repeat;
 };
 
+enum decckm { DECCKM_CSI, DECCKM_SS3 };
+enum keypad_mode { KEYPAD_NUMERICAL, KEYPAD_APPLICATION };
+
 struct terminal {
     pid_t slave;
     int ptmx;
+    enum decckm decckm;
+    enum keypad_mode keypad_mode;
     bool bracketed_paste;
     struct vt vt;
     struct grid grid;