[Keyboard] Add IBM Model M SSK configuration (#14050)

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>

11 files changed, 938 insertions, 0 deletions

diff --git a/keyboards/converter/modelm_ssk/config.h b/keyboards/converter/modelm_ssk/config.h
new file mode 100644
index 0000000000..74d549ba49
--- /dev/null
+++ b/keyboards/converter/modelm_ssk/config.h
@@ -0,0 +1,76 @@
+/*
+Copyright 2019-2021 iw0rm3r, tiltowait
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#pragma once
+
+#include "config_common.h"
+
+/* USB Device descriptor parameter */
+#define VENDOR_ID       0xFEED
+#define PRODUCT_ID      0x0000
+#define DEVICE_VER      0x0001
+#define MANUFACTURER    tiltowait
+#define PRODUCT         IBM Model M Space-Saving Keyboard
+
+/* key matrix size */
+#define MATRIX_ROWS 8
+#define MATRIX_COLS 16
+
+/*
+ * Keyboard Matrix Assignments
+ *
+ * Change this to how you wired your keyboard
+ * COLS: AVR pins used for columns, left to right
+ * ROWS: AVR pins used for rows, top to bottom
+ * DIODE_DIRECTION: COL2ROW = COL = Anode (+), ROW = Cathode (-, marked on diode)
+ *                  ROW2COL = ROW = Anode (+), COL = Cathode (-, marked on diode)
+ *
+*/
+#define MATRIX_COL_PINS { C7, C6, C5, C4, C3, C2, C1, C0, E1, E0, D7, D5, D4, D3, D2, D1 }
+#define MATRIX_ROW_PINS { F0, F1, F2, F3, F4, F5, F6, F7 }
+#define UNUSED_PINS
+
+/* COL2ROW, ROW2COL*/
+#define DIODE_DIRECTION ROW2COL
+
+/* Debounce reduces chatter (unintended double-presses) - set 0 if debouncing is not needed (5 is default) */
+#define DEBOUNCE 5
+
+/* The Model M does not have NKRO */
+#define MATRIX_HAS_GHOST
+
+#define LED_NUM_LOCK_PIN B4
+#define LED_CAPS_LOCK_PIN B6
+#define LED_SCROLL_LOCK_PIN B5
+
+/*
+ * Feature disable options
+ *  These options are also useful to firmware size reduction.
+ */
+
+/* disable debug print */
+//#define NO_DEBUG
+
+/* disable print */
+//#define NO_PRINT
+
+/* disable action features */
+//#define NO_ACTION_LAYER
+//#define NO_ACTION_TAPPING
+//#define NO_ACTION_ONESHOT
+//#define NO_ACTION_MACRO
+//#define NO_ACTION_FUNCTION
diff --git a/keyboards/converter/modelm_ssk/info.json b/keyboards/converter/modelm_ssk/info.json
new file mode 100644
index 0000000000..e347d66722
--- /dev/null
+++ b/keyboards/converter/modelm_ssk/info.json
@@ -0,0 +1,457 @@
+{
+    "keyboard_name": "IBM Model M Space-Saving Keyboard",
+    "url": "https://github.com/tiltowait/qmk_firmware/tree/modelm_ssk/keyboards/converter/modelm_ssk",
+    "maintainer": "tiltowait",
+    "width": 17.75,
+    "height": 6.5,
+    "layouts":
+    {
+        "LAYOUT":
+        {
+            "layout":
+            [
+                {
+                    "label": "Esc",
+                    "x": 0,
+                    "y": 0
+                },
+                {
+                    "label": "F1",
+                    "x": 2,
+                    "y": 0
+                },
+                {
+                    "label": "F2",
+                    "x": 3,
+                    "y": 0
+                },
+                {
+                    "label": "F3",
+                    "x": 4,
+                    "y": 0
+                },
+                {
+                    "label": "F4",
+                    "x": 5,
+                    "y": 0
+                },
+                {
+                    "label": "F5",
+                    "x": 6.5,
+                    "y": 0
+                },
+                {
+                    "label": "F6",
+                    "x": 7.5,
+                    "y": 0
+                },
+                {
+                    "label": "F7",
+                    "x": 8.5,
+                    "y": 0
+                },
+                {
+                    "label": "F8",
+                    "x": 9.5,
+                    "y": 0
+                },
+                {
+                    "label": "F9",
+                    "x": 11,
+                    "y": 0
+                },
+                {
+                    "label": "F10",
+                    "x": 12,
+                    "y": 0
+                },
+                {
+                    "label": "F11",
+                    "x": 13,
+                    "y": 0
+                },
+                {
+                    "label": "F12",
+                    "x": 14,
+                    "y": 0
+                },
+                {
+                    "label": "PrtSc",
+                    "x": 15.25,
+                    "y": 0
+                },
+                {
+                    "label": "Scroll Lock",
+                    "x": 16.25,
+                    "y": 0
+                },
+                {
+                    "label": "Pause",
+                    "x": 17.25,
+                    "y": 0
+                },
+                {
+                    "label": "~",
+                    "x": 0,
+                    "y": 1.5
+                },
+                {
+                    "label": "!",
+                    "x": 1,
+                    "y": 1.5
+                },
+                {
+                    "label": "@",
+                    "x": 2,
+                    "y": 1.5
+                },
+                {
+                    "label": "#",
+                    "x": 3,
+                    "y": 1.5
+                },
+                {
+                    "label": "$",
+                    "x": 4,
+                    "y": 1.5
+                },
+                {
+                    "label": "%",
+                    "x": 5,
+                    "y": 1.5
+                },
+                {
+                    "label": "^",
+                    "x": 6,
+                    "y": 1.5
+                },
+                {
+                    "label": "&",
+                    "x": 7,
+                    "y": 1.5
+                },
+                {
+                    "label": "*",
+                    "x": 8,
+                    "y": 1.5
+                },
+                {
+                    "label": "(",
+                    "x": 9,
+                    "y": 1.5
+                },
+                {
+                    "label": ")",
+                    "x": 10,
+                    "y": 1.5
+                },
+                {
+                    "label": "_",
+                    "x": 11,
+                    "y": 1.5
+                },
+                {
+                    "label": "+",
+                    "x": 12,
+                    "y": 1.5
+                },
+                {
+                    "label": "Backspace",
+                    "x": 13,
+                    "y": 1.5,
+                    "w": 2
+                },
+                {
+                    "label": "Insert",
+                    "x": 15.25,
+                    "y": 1.5
+                },
+                {
+                    "label": "Home",
+                    "x": 16.25,
+                    "y": 1.5
+                },
+                {
+                    "label": "PgUp",
+                    "x": 17.25,
+                    "y": 1.5
+                },
+                {
+                    "label": "Tab",
+                    "x": 0,
+                    "y": 2.5,
+                    "w": 1.5
+                },
+                {
+                    "label": "Q",
+                    "x": 1.5,
+                    "y": 2.5
+                },
+                {
+                    "label": "W",
+                    "x": 2.5,
+                    "y": 2.5
+                },
+                {
+                    "label": "E",
+                    "x": 3.5,
+                    "y": 2.5
+                },
+                {
+                    "label": "R",
+                    "x": 4.5,
+                    "y": 2.5
+                },
+                {
+                    "label": "T",
+                    "x": 5.5,
+                    "y": 2.5
+                },
+                {
+                    "label": "Y",
+                    "x": 6.5,
+                    "y": 2.5
+                },
+                {
+                    "label": "U",
+                    "x": 7.5,
+                    "y": 2.5
+                },
+                {
+                    "label": "I",
+                    "x": 8.5,
+                    "y": 2.5
+                },
+                {
+                    "label": "O",
+                    "x": 9.5,
+                    "y": 2.5
+                },
+                {
+                    "label": "P",
+                    "x": 10.5,
+                    "y": 2.5
+                },
+                {
+                    "label": "{",
+                    "x": 11.5,
+                    "y": 2.5
+                },
+                {
+                    "label": "}",
+                    "x": 12.5,
+                    "y": 2.5
+                },
+                {
+                    "label": "|",
+                    "x": 13.5,
+                    "y": 2.5,
+                    "w": 1.5
+                },
+                {
+                    "label": "Delete",
+                    "x": 15.25,
+                    "y": 2.5
+                },
+                {
+                    "label": "End",
+                    "x": 16.25,
+                    "y": 2.5
+                },
+                {
+                    "label": "PgDn",
+                    "x": 17.25,
+                    "y": 2.5
+                },
+                {
+                    "label": "Caps Lock",
+                    "x": 0,
+                    "y": 3.5,
+                    "w": 1.5
+                },
+                {
+                    "label": "A",
+                    "x": 1.75,
+                    "y": 3.5
+                },
+                {
+                    "label": "S",
+                    "x": 2.75,
+                    "y": 3.5
+                },
+                {
+                    "label": "D",
+                    "x": 3.75,
+                    "y": 3.5
+                },
+                {
+                    "label": "F",
+                    "x": 4.75,
+                    "y": 3.5
+                },
+                {
+                    "label": "G",
+                    "x": 5.75,
+                    "y": 3.5
+                },
+                {
+                    "label": "H",
+                    "x": 6.75,
+                    "y": 3.5
+                },
+                {
+                    "label": "J",
+                    "x": 7.75,
+                    "y": 3.5
+                },
+                {
+                    "label": "K",
+                    "x": 8.75,
+                    "y": 3.5
+                },
+                {
+                    "label": "L",
+                    "x": 9.75,
+                    "y": 3.5
+                },
+                {
+                    "label": ":",
+                    "x": 10.75,
+                    "y": 3.5
+                },
+                {
+                    "label": "\"",
+                    "x": 11.75,
+                    "y": 3.5
+                },
+                {
+                    "label": "~",
+                    "x": 12.75,
+                    "y": 3.5
+                },
+                {
+                    "label": "Enter",
+                    "x": 13.75,
+                    "y": 3.5,
+                    "w": 1.25
+                },
+                {
+                    "label": "Shift",
+                    "x": 0,
+                    "y": 4.5,
+                    "w": 1.25
+                },
+                {
+                    "label": "|",
+                    "x": 1.25,
+                    "y": 4.5
+                },
+                {
+                    "label": "Z",
+                    "x": 2.25,
+                    "y": 4.5
+                },
+                {
+                    "label": "X",
+                    "x": 3.25,
+                    "y": 4.5
+                },
+                {
+                    "label": "C",
+                    "x": 4.25,
+                    "y": 4.5
+                },
+                {
+                    "label": "V",
+                    "x": 5.25,
+                    "y": 4.5
+                },
+                {
+                    "label": "B",
+                    "x": 6.25,
+                    "y": 4.5
+                },
+                {
+                    "label": "N",
+                    "x": 7.25,
+                    "y": 4.5
+                },
+                {
+                    "label": "M",
+                    "x": 8.25,
+                    "y": 4.5
+                },
+                {
+                    "label": "<",
+                    "x": 9.25,
+                    "y": 4.5
+                },
+                {
+                    "label": ">",
+                    "x": 10.25,
+                    "y": 4.5
+                },
+                {
+                    "label": "?",
+                    "x": 11.25,
+                    "y": 4.5
+                },
+                {
+                    "label": "Shift",
+                    "x": 12.25,
+                    "y": 4.5,
+                    "w": 2.75
+                },
+                {
+                    "label": "↑",
+                    "x": 16.25,
+                    "y": 4.5
+                },
+                {
+                    "label": "Ctrl",
+                    "x": 0,
+                    "y": 5.5,
+                    "w": 1.5
+                },
+                {
+                    "label": "Alt",
+                    "x": 2.5,
+                    "y": 5.5,
+                    "w": 1.5
+                },
+                {
+                    "x": 4,
+                    "y": 5.5,
+                    "w": 7
+                },
+                {
+                    "label": "Alt",
+                    "x": 11,
+                    "y": 5.5,
+                    "w": 1.5
+                },
+                {
+                    "label": "Ctrl",
+                    "x": 13.5,
+                    "y": 5.5,
+                    "w": 1.5
+                },
+                {
+                    "label": "←",
+                    "x": 15.25,
+                    "y": 5.5
+                },
+                {
+                    "label": "↓",
+                    "x": 16.25,
+                    "y": 5.5
+                },
+                {
+                    "label": "→",
+                    "x": 17.25,
+                    "y": 5.5
+                }
+            ]
+        }
+    }
+}
diff --git a/keyboards/converter/modelm_ssk/keymaps/default/keymap.c b/keyboards/converter/modelm_ssk/keymaps/default/keymap.c
new file mode 100644
index 0000000000..adf557b268
--- /dev/null
+++ b/keyboards/converter/modelm_ssk/keymaps/default/keymap.c
@@ -0,0 +1,114 @@
+/* Copyright 2019-2021 iw0rm3r, tiltowait
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include QMK_KEYBOARD_H
+
+enum custom_layers {
+    _BASE,
+    _NUMPAD,
+};
+
+enum custom_keycodes {
+  NUM_SCRL = SAFE_RANGE
+};
+
+void toggle_numpad_layer(int set_state);
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+  [_BASE] = LAYOUT( /* Base layer */
+    KC_ESC,           KC_F1,  KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,    KC_PSCR, NUM_SCRL, KC_PAUS,
+    KC_GRV,  KC_1,    KC_2,   KC_3,    KC_4,    KC_5,    KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_MINS, KC_EQL,  KC_BSPC,   KC_INS,  KC_HOME,  KC_PGUP,
+    KC_TAB,  KC_Q,    KC_W,   KC_E,    KC_R,    KC_T,    KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_LBRC, KC_RBRC, KC_BSLS,   KC_DEL,  KC_END,   KC_PGDN,
+    KC_CAPS, KC_A,    KC_S,   KC_D,    KC_F,    KC_G,    KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_QUOT, KC_NUHS, KC_ENT,
+    KC_LSFT, KC_NUBS, KC_Z,   KC_X,    KC_C,    KC_V,    KC_B,    KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH,          KC_RSFT,            KC_UP,
+    KC_LCTL,          KC_LALT,                           KC_SPC,                                      KC_RALT,          KC_RCTL,   KC_LEFT, KC_DOWN,  KC_RGHT
+  ),
+  [_NUMPAD] = LAYOUT( /* Numpad Layer */
+     KC_TRNS,          KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,        KC_TRNS,     KC_TRNS,    KC_TRNS,   KC_TRNS, KC_TRNS, KC_TRNS,
+
+     KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_KP_7, KC_KP_8, KC_KP_9, KC_TRNS,        KC_KP_MINUS, KC_KP_PLUS, KC_TRNS,   KC_TRNS, KC_TRNS, KC_TRNS,
+     KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_KP_4, KC_KP_5, KC_KP_6, KC_TRNS,        KC_TRNS,     KC_TRNS,    KC_TRNS,   KC_TRNS, KC_TRNS, KC_TRNS,
+     KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_KP_1, KC_KP_2, KC_KP_3, KC_KP_ASTERISK, KC_TRNS,     KC_TRNS,    KC_TRNS,
+     KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_KP_0, KC_TRNS, KC_KP_DOT,      KC_KP_SLASH,             KC_TRNS,            KC_TRNS,
+     KC_TRNS,          KC_TRNS,                            KC_TRNS,                                            KC_TRNS,                 KC_TRNS,   KC_TRNS, KC_TRNS, KC_TRNS
+  ),
+};
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+  static uint16_t last_num_scroll = 0; /* For unregistering the proper key */
+
+  switch (keycode) {
+    case NUM_SCRL: /* Numlock / Scroll Lock */
+    if (record->event.pressed) {
+      if (get_mods() & MOD_MASK_SHIFT) {
+        /* Remove the shift modifiers */
+        uint8_t shift_mods = get_mods() & (MOD_BIT(KC_LSFT) | MOD_BIT(KC_RSFT));
+        del_mods(MOD_MASK_SHIFT);
+
+        last_num_scroll = KC_NUMLOCK;
+        register_code(last_num_scroll);
+        toggle_numpad_layer(-1);
+
+        /* Reset the shift modifiers */
+        set_mods(shift_mods);
+      } else {
+        last_num_scroll = KC_SCROLLLOCK;
+        register_code(last_num_scroll);
+      }
+    } else {
+      unregister_code(last_num_scroll);
+    }
+    break;
+  }
+  return true;
+}
+
+void toggle_numpad_layer(int set_state) {
+  static uint8_t numlock_enabled = 0;
+
+  /* set_state allows us to explicitly change the numlock state
+     rather than merely toggling it. */
+  if (set_state == -1) {
+    numlock_enabled = !numlock_enabled;
+  } else {
+    numlock_enabled = set_state;
+  }
+
+  if (numlock_enabled) {
+    layer_on(_NUMPAD);
+  }
+  else {
+    layer_off(_NUMPAD);
+  }
+}
+
+bool led_update_user(led_t led_state) {
+  /* In rare and unlikely conditions, it's possible for numlock
+     state to change externally from the keyboard. If this happens,
+     we want to match the new state.
+
+     On Windows and Linux, this means that the keyboard will technically
+     toggle the numpad layer twice.
+  */
+
+  static int8_t numlock_state = -1; /* Unknown state at default */
+
+  if (led_state.num_lock != numlock_state) {
+    numlock_state = led_state.num_lock;
+    toggle_numpad_layer(led_state.num_lock);
+  }
+  return true;
+}
+
diff --git a/keyboards/converter/modelm_ssk/keymaps/default/readme.md b/keyboards/converter/modelm_ssk/keymaps/default/readme.md
new file mode 100644
index 0000000000..bc829be266
--- /dev/null
+++ b/keyboards/converter/modelm_ssk/keymaps/default/readme.md
@@ -0,0 +1 @@
+# The default keymap for modelm_ssk
diff --git a/keyboards/converter/modelm_ssk/keymaps/tiltowait/config.h b/keyboards/converter/modelm_ssk/keymaps/tiltowait/config.h
new file mode 100644
index 0000000000..151118fdf6
--- /dev/null
+++ b/keyboards/converter/modelm_ssk/keymaps/tiltowait/config.h
@@ -0,0 +1,21 @@
+/* Copyright 2021 tiltowait
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+// place overrides here
+
+#define PERMISSIVE_HOLD
diff --git a/keyboards/converter/modelm_ssk/keymaps/tiltowait/keymap.c b/keyboards/converter/modelm_ssk/keymaps/tiltowait/keymap.c
new file mode 100644
index 0000000000..58726fec86
--- /dev/null
+++ b/keyboards/converter/modelm_ssk/keymaps/tiltowait/keymap.c
@@ -0,0 +1,116 @@
+/* Copyright 2021 tiltowait
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include QMK_KEYBOARD_H
+
+enum custom_layers {
+    _BASE,
+    _SECOND,
+    _NUMPAD,
+};
+
+enum custom_keycodes {
+  NUM_SCRL = SAFE_RANGE /* Dual-purpose Scroll Lock / Numlock button as on original hardware */
+};
+
+void toggle_numlock_layer(int set_state);
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+  [_BASE] = LAYOUT( /* Base layer */
+    KC_ESC,                KC_F1,  KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_F7,   KC_F8,   KC_MUTE, KC_F10,  KC_VOLD, KC_VOLU,   S(G(KC_4)), NUM_SCRL, KC_PAUS,
+
+    KC_GRV,       KC_1,    KC_2,   KC_3,    KC_4,    KC_5,    KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_MINS, KC_EQL,  KC_BSLS,   KC_INS,  KC_HOME,  KC_PGUP,
+    LT(_SECOND,KC_TAB), KC_Q,    KC_W,   KC_E,    KC_R,    KC_T,    KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_LBRC, KC_RBRC, KC_BSPC,   KC_DEL,  KC_END,   KC_PGDN,
+    KC_LCTL,      KC_A,    KC_S,   KC_D,    KC_F,    KC_G,    KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_QUOT, KC_NUHS, KC_ENT,
+    KC_LSFT,      KC_NUBS, KC_Z,   KC_X,    KC_C,    KC_V,    KC_B,    KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH,          KC_RSFT,            KC_UP,
+    KC_LALT,               LGUI_T(KC_ENT),                    KC_SPC,                                      KC_RALT,          KC_RCTL,   KC_LEFT, KC_DOWN,  KC_RGHT
+  ),
+  [_SECOND] = LAYOUT( /* Layer 1 */
+     KC_TRNS,          KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,    KC_TRNS,       KC_TRNS, KC_TRNS,   KC_TRNS, KC_TRNS, KC_TRNS,
+
+     KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,    KC_TRNS,    KC_TRNS, KC_TRNS,    S(A(KC_MINS)), KC_TRNS, KC_TRNS,   KC_TRNS, KC_TRNS, KC_TRNS,
+     KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, C(KC_LEFT), C(KC_RGHT), KC_TRNS, KC_TRNS,    KC_TRNS,       KC_TRNS, KC_TRNS,   KC_TRNS, KC_TRNS, KC_TRNS,
+     KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_LEFT, KC_DOWN,    KC_UP,      KC_RGHT, S(A(KC_M)), KC_TRNS,       KC_TRNS, KC_TRNS,
+     KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,    KC_ENT,     KC_TRNS, KC_TRNS,    KC_TRNS,                KC_TRNS,            KC_TRNS,
+     KC_TRNS,          KC_TRNS,                            C(KC_SPC),                                            KC_TRNS,                KC_TRNS,   KC_TRNS, KC_TRNS, KC_TRNS
+  ),
+  [_NUMPAD] = LAYOUT( /* Numpad Layer */
+     KC_TRNS,          KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,        KC_TRNS,     KC_TRNS,    KC_TRNS,   KC_TRNS, KC_TRNS, KC_TRNS,
+
+     KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_KP_7, KC_KP_8, KC_KP_9, KC_TRNS,        KC_KP_MINUS, KC_KP_PLUS, KC_TRNS,   KC_TRNS, KC_TRNS, KC_TRNS,
+     KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_KP_4, KC_KP_5, KC_KP_6, KC_TRNS,        KC_TRNS,     KC_TRNS,    KC_TRNS,   KC_TRNS, KC_TRNS, KC_TRNS,
+     KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_KP_1, KC_KP_2, KC_KP_3, KC_KP_ASTERISK, KC_TRNS,     KC_TRNS,    KC_TRNS,
+     KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_KP_0, KC_TRNS, KC_KP_DOT,      KC_KP_SLASH,             KC_TRNS,            KC_TRNS,
+     KC_TRNS,          KC_TRNS,                            KC_TRNS,                                            KC_TRNS,                 KC_TRNS,   KC_TRNS, KC_TRNS, KC_TRNS
+  ),
+};
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+  static uint16_t last_num_scroll = 0; /* For unregistering the proper key */
+
+  switch (keycode) {
+    case NUM_SCRL:
+    if (record->event.pressed) {
+      if (get_mods() & MOD_MASK_SHIFT) {
+        /* Remove the shift modifiers */
+        uint8_t shift_mods = get_mods() & (MOD_BIT(KC_LSFT) | MOD_BIT(KC_RSFT));
+        set_mods(get_mods() & ~(MOD_BIT(KC_LSFT) | MOD_BIT(KC_RSFT)) );
+
+        last_num_scroll = KC_NUMLOCK;
+        register_code(last_num_scroll);
+        toggle_numlock_layer(-1);
+
+        /* Reset the shift modifiers */
+        set_mods(shift_mods);
+      } else {
+        last_num_scroll = KC_SCROLLLOCK;
+        register_code(last_num_scroll);
+      }
+    } else {
+      unregister_code(last_num_scroll);
+    }
+    break;
+  }
+  return true;
+}
+
+void toggle_numlock_layer(int set_state) {
+  static uint8_t numlock_enabled = 0;
+
+  /* set_state allows us to explicitly change the numlock state
+     rather than merely toggling it. */
+  if (set_state == -1) {
+    numlock_enabled = !numlock_enabled;
+  } else {
+    numlock_enabled = set_state;
+  }
+
+  if (numlock_enabled) {
+    layer_on(_NUMPAD);
+  }
+  else {
+    layer_off(_NUMPAD);
+  }
+}
+
+bool led_update_kb(led_t led_state) {
+  static int8_t numlock_state = -1;
+
+  if (led_state.num_lock != numlock_state) {
+    numlock_state = led_state.num_lock;
+    toggle_numlock_layer(led_state.num_lock);
+  }
+  return true;
+}
diff --git a/keyboards/converter/modelm_ssk/keymaps/tiltowait/readme.md b/keyboards/converter/modelm_ssk/keymaps/tiltowait/readme.md
new file mode 100644
index 0000000000..aecdd89b82
--- /dev/null
+++ b/keyboards/converter/modelm_ssk/keymaps/tiltowait/readme.md
@@ -0,0 +1,11 @@
+# The maintainer's personal keymap for modelm_ssk
+
+This is a keymap suitable for macOS use.
+
+* Backspace and backslash have been swapped (HHKB style)
+* Capslock is LCTRL
+* LCTRL is LALT
+* LALT is LGUI
+* Tab shifts to layer 1 on hold
+* Layer 1 has a couple of Mac shortcuts, plus Vim-style arrow keys
+* Shift+Numlock enables numlock
diff --git a/keyboards/converter/modelm_ssk/modelm_ssk.c b/keyboards/converter/modelm_ssk/modelm_ssk.c
new file mode 100644
index 0000000000..1b01115e5d
--- /dev/null
+++ b/keyboards/converter/modelm_ssk/modelm_ssk.c
@@ -0,0 +1,19 @@
+/* Copyright 2019 iw0rm3r
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "modelm_ssk.h"
+
+
+
diff --git a/keyboards/converter/modelm_ssk/modelm_ssk.h b/keyboards/converter/modelm_ssk/modelm_ssk.h
new file mode 100644
index 0000000000..5c4b9b80ea
--- /dev/null
+++ b/keyboards/converter/modelm_ssk/modelm_ssk.h
@@ -0,0 +1,45 @@
+/* Copyright 2019-2021 iw0rm3r, tiltowait
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+
+#include "quantum.h"
+
+/* This a shortcut to help you visually see your layout.
+ * The first section contains "names" for physical keys of the keyboard
+ * and defines their position on the board.
+ * The second section defines position of the keys on the switch matrix 
+ * (where COLUMNS and ROWS crosses). */
+
+#define LAYOUT( \
+    K5A,      K5B, K5C, K5D, K5E, K5F, K5G, K5H, K5I, K5J, K5K, K5L, K5M,   K5N, K5O, K5P, \
+    \
+    K4A, K4B, K4C, K4D, K4E, K4F, K4G, K4H, K4I, K4J, K4K, K4L, K4M, K4N,   K4O, K4P, K4Q, \
+    K3A, K3B, K3C, K3D, K3E, K3F, K3G, K3H, K3I, K3J, K3K, K3L, K3M, K3N,   K3O, K3P, K3Q, \
+    K2A, K2B, K2C, K2D, K2E, K2F, K2G, K2H, K2I, K2J, K2K, K2L, K2M, K2N,                  \
+    K1A, K1B, K1C, K1D, K1E, K1F, K1G, K1H, K1I, K1J, K1K, K1L,      K1M,        K1N,      \
+    K0A,      K0B,                K0C,                     K0D,      K0E,   K0F, K0G, K0H  \
+) \
+{ \
+/* 00 */ { KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, K1G,   K0C,   K1H,   KC_NO, KC_NO, K1L,   K0G,   K0H,   KC_NO, K0F,   K0D   }, \
+/* 01 */ { K0E,   K1M,   K1C,   K1D,   K1E,   K1F,   K2N,   K1I,   K1J,   K1K,   KC_NO, KC_NO, KC_NO, KC_NO, K5P,   KC_NO }, \
+/* 02 */ { KC_NO, KC_NO, K2B,   K2C,   K2D,   K2E,   K3N,   K2H,   K2I,   K2J,   K2K,   KC_NO, KC_NO, KC_NO, KC_NO, KC_NO }, \
+/* 03 */ { KC_NO, KC_NO, K3B,   K3C,   K3D,   K3E,   KC_NO, K3H,   K3I,   K3J,   K3K,   KC_NO, KC_NO, KC_NO, KC_NO, K5O   }, \
+/* 04 */ { KC_NO, KC_NO, K4B,   K4C,   K4D,   K4E,   K5K,   K4H,   K4I,   K4J,   K4K,   K5L,   K5M,   K3Q,   K3P,   K5N   }, \
+/* 05 */ { K0A,   KC_NO, K4A,   K5B,   K5C,   K4F,   K5J,   K4G,   K4M,   K5I,   K4L,   K3O,   K4O,   K4Q,   K4P,   KC_NO }, \
+/* 06 */ { KC_NO, K1A,   K3A,   K2A,   K5D,   K3F,   K4N,   K3G,   K3M,   K5H,   K3L,   KC_NO, KC_NO, KC_NO, KC_NO, KC_NO }, \
+/* 07 */ { KC_NO, KC_NO, K5A,   KC_NO, K5E,   K2F,   K5F,   K2G,   K5G,   KC_NO, K2L,   KC_NO, KC_NO, KC_NO, K1N,   K0B   }, \
+}
+/*         0      1      2      3      4      5      6      7      8      9      A      B      C      D      E      F       */
diff --git a/keyboards/converter/modelm_ssk/readme.md b/keyboards/converter/modelm_ssk/readme.md
new file mode 100644
index 0000000000..8105a0c2df
--- /dev/null
+++ b/keyboards/converter/modelm_ssk/readme.md
@@ -0,0 +1,55 @@
+# modelm_ssk
+
+![IBM Model M Space-Saving Keyboard](https://i.imgur.com/CSXrQI5.jpg)
+
+This is a QMK firmware configuration for the IBM Model M Space-Saving Keyboard (SSK). Based on [this project](https://github.com/qmk/qmk_firmware/tree/master/keyboards/converter/modelm101), it features a few slight improvements and, most importantly, a full remapping to match the SSK's matrix, which differs from its full-sized cousins. The modification is easily reversible, as no part of the keyboard is permanently changed. Just take out the replacement controller and reinstall the original, should you desire.
+
+The numpad layer (accessed with Shift + Scroll Lock as with the original controller) is mapped to layer 7 by default. All non-numpad keys are transparent.
+
+**Note:** As of this writing, this configuration has only been tested on the 1392464 SSK. It's possi