qmk_firmware/keyboards/montsinger/rewind/keymaps/default/keymap.c

#include QMK_KEYBOARD_H

// Each layer gets a name for readability, which is then used in the keymap matrix below.
// The underscores don't mean anything - you can have a layer called STUFF or any other name.
// Layer names don't all need to be of the same length, obviously, and you can also skip them
// entirely and just use numbers.

enum layer_names
{
  _QWERTY,
  _FN1,
  _SYM
};

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {

[_QWERTY] = LAYOUT_ortho_5x10(
   KC_1,    KC_2,    KC_3,    KC_4,    KC_5,    KC_6,    KC_7,    KC_8,    KC_9,    KC_0,
   KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,    KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,
   KC_A,    KC_S,    KC_D,    KC_F,    KC_G,    KC_H,    KC_J,    KC_K,    KC_L,    KC_QUOT,
   KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,    KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH,
   KC_LCTL, KC_LALT, KC_LGUI, KC_LSFT, MO(_SYM),KC_ENTER,KC_SPC,  MO(_FN1),KC_BSPC, KC_DEL
),

[_FN1] = LAYOUT_ortho_5x10(
   KC_ESC,  XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,
   XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,
   XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, KC_HOME, KC_LEFT, KC_UP,   KC_RIGHT,KC_END,
   XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, KC_DOWN, XXXXXXX, XXXXXXX,
   QK_BOOT,   XXXXXXX, XXXXXXX, _______, KC_BSPC, KC_DEL,  XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX
),

[_SYM] = LAYOUT_ortho_5x10(
   KC_ESC,  XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, KC_MINS, KC_PLUS,
   KC_TAB,  XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,
   KC_CAPS, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, KC_SCLN,
   XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, KC_BSLS,
   XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX
),
};