diff --git a/keyboards/handwired/at101ish/keyboard.json b/keyboards/handwired/at101ish/keyboard.json
new file mode 100644
index 0000000000..bd629f1605
--- /dev/null
+++ b/keyboards/handwired/at101ish/keyboard.json
@@ -0,0 +1,363 @@
+{
+ "manufacturer": "Henrik O. S\u00f8rensen",
+ "keyboard_name": "AT101ish",
+ "maintainer": "qmk",
+ "bootloader": "halfkay",
+ "diode_direction": "ROW2COL",
+ "features": {
+ "bootmagic": true,
+ "command": true,
+ "console": true,
+ "extrakey": true,
+ "nkro": true
+ },
+ "indicators": {
+ "caps_lock": "D6",
+ "num_lock": "D4",
+ "scroll_lock": "E6"
+ },
+ "matrix_pins": {
+ "cols": ["D7", "B4", "B5", "B6", "F7", "F6", "F5", "F4", "F1", "F0"],
+ "rows": ["B1", "B0", "B2", "D5", "B3", "C7", "B7", "C6", "D0", "D3", "D1", "D2"]
+ },
+ "processor": "atmega32u4",
+ "tags": ["at101", "at102", "bigfoot"],
+ "url": "https://github.com/henrikosorensen/keyboard_pcbs/tree/master/at101_pcb",
+ "usb": {
+ "device_version": "1.1.0",
+ "pid": "0x0101",
+ "vid": "0xFEED"
+ },
+ "community_layouts": ["fullsize_ansi", "fullsize_iso"],
+ "layouts": {
+ "LAYOUT_all": {
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+ {"matrix": [6, 5], "x": 5.75, "y": 3.5},
+ {"matrix": [6, 6], "x": 6.75, "y": 3.5},
+ {"matrix": [6, 7], "x": 7.75, "y": 3.5},
+ {"matrix": [6, 8], "x": 8.75, "y": 3.5},
+ {"matrix": [6, 9], "x": 9.75, "y": 3.5},
+ {"matrix": [7, 0], "x": 10.75, "y": 3.5},
+ {"matrix": [7, 1], "x": 11.75, "y": 3.5},
+ {"matrix": [7, 2], "x": 12.75, "y": 3.5},
+ {"matrix": [7, 3], "x": 13.75, "y": 2.5, "w": 1.25, "h": 2},
+ {"matrix": [7, 6], "x": 18.5, "y": 3.5},
+ {"matrix": [7, 7], "x": 19.5, "y": 3.5},
+ {"matrix": [7, 8], "x": 20.5, "y": 3.5},
+ {"matrix": [8, 0], "x": 0, "y": 4.5, "w": 1.25},
+ {"matrix": [8, 1], "x": 1.25, "y": 4.5},
+ {"matrix": [8, 2], "x": 2.25, "y": 4.5},
+ {"matrix": [8, 3], "x": 3.25, "y": 4.5},
+ {"matrix": [8, 4], "x": 4.25, "y": 4.5},
+ {"matrix": [8, 5], "x": 5.25, "y": 4.5},
+ {"matrix": [8, 6], "x": 6.25, "y": 4.5},
+ {"matrix": [8, 7], "x": 7.25, "y": 4.5},
+ {"matrix": [8, 8], "x": 8.25, "y": 4.5},
+ {"matrix": [8, 9], "x": 9.25, "y": 4.5},
+ {"matrix": [9, 0], "x": 10.25, "y": 4.5},
+ {"matrix": [9, 1], "x": 11.25, "y": 4.5},
+ {"matrix": [9, 2], "x": 12.25, "y": 4.5, "w": 2.75},
+ {"matrix": [9, 4], "x": 16.25, "y": 4.5},
+ {"matrix": [9, 6], "x": 18.5, "y": 4.5},
+ {"matrix": [9, 7], "x": 19.5, "y": 4.5},
+ {"matrix": [9, 8], "x": 20.5, "y": 4.5},
+ {"matrix": [9, 9], "x": 21.5, "y": 4.5, "h": 2},
+ {"matrix": [10, 0], "x": 0, "y": 5.5, "w": 1.25},
+ {"matrix": [10, 1], "x": 1.25, "y": 5.5, "w": 1.25},
+ {"matrix": [10, 2], "x": 2.5, "y": 5.5, "w": 1.25},
+ {"matrix": [10, 7], "x": 3.75, "y": 5.5, "w": 6.25},
+ {"matrix": [11, 0], "x": 10, "y": 5.5, "w": 1.25},
+ {"matrix": [11, 1], "x": 11.25, "y": 5.5, "w": 1.25},
+ {"matrix": [11, 2], "x": 12.5, "y": 5.5, "w": 1.25},
+ {"matrix": [11, 3], "x": 13.75, "y": 5.5, "w": 1.25},
+ {"matrix": [11, 4], "x": 15.25, "y": 5.5},
+ {"matrix": [11, 5], "x": 16.25, "y": 5.5},
+ {"matrix": [11, 6], "x": 17.25, "y": 5.5},
+ {"matrix": [11, 7], "x": 18.5, "y": 5.5, "w": 2},
+ {"matrix": [11, 8], "x": 20.5, "y": 5.5}
+ ]
+ }
+ }
+}
diff --git a/keyboards/handwired/at101ish/keymaps/default/keymap.c b/keyboards/handwired/at101ish/keymaps/default/keymap.c
new file mode 100644
index 0000000000..2311a24437
--- /dev/null
+++ b/keyboards/handwired/at101ish/keymaps/default/keymap.c
@@ -0,0 +1,27 @@
+/* Copyright 2025 Henrik Otte Sørensen (@henrikottesorensen)
+ *
+ * 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
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+ [0] = LAYOUT_all(
+ 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, KC_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_NUM, KC_PSLS, KC_PAST, KC_PMNS,
+ 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_P7, KC_P8, KC_P9, KC_PPLS,
+ 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_P4, KC_P5, KC_P6, KC_PEQL,
+ 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_BSLS, KC_UP, KC_P1, KC_P2, KC_P3, KC_PENT,
+ KC_LCTL, KC_LGUI, KC_LALT, KC_SPACE, KC_RALT, KC_RGUI, KC_APP, KC_RCTL, KC_LEFT, KC_DOWN, KC_RGHT, KC_P0, KC_PDOT)
+};
diff --git a/keyboards/handwired/at101ish/keymaps/osdetect/keymap.c b/keyboards/handwired/at101ish/keymaps/osdetect/keymap.c
new file mode 100644
index 0000000000..89b748a61b
--- /dev/null
+++ b/keyboards/handwired/at101ish/keymaps/osdetect/keymap.c
@@ -0,0 +1,59 @@
+/* Copyright 2025 Henrik Otte Sørensen (@henrikottesorensen)
+ *
+ * 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 LAYER {
+ _PC = 0,
+ _MAC,
+ _FN
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+ [_PC] = LAYOUT_all(
+ 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, KC_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_NUM, KC_PSLS, KC_PAST, KC_PMNS,
+ 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_P7, KC_P8, KC_P9, KC_PPLS,
+ 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_P4, KC_P5, KC_P6, KC_PEQL,
+ 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_BSLS, KC_UP, KC_P1, KC_P2, KC_P3, KC_PENT,
+ KC_LCTL, KC_LGUI, KC_LALT, KC_SPACE, KC_RALT, KC_RGUI, MO(_FN), KC_RCTL, KC_LEFT, KC_DOWN, KC_RGHT, KC_P0, KC_PDOT),
+ [_MAC] = LAYOUT_all(
+ KC_ESC, KC_BRID, KC_BRIU, KC_MCTL, KC_WSCH, KC_LPAD, _______, KC_MPRV, KC_MPLY, KC_MNXT, KC_MUTE, KC_VOLD, KC_VOLU, KC_PSCR, KC_SCRL, KC_PAUS,
+ KC_NUBS, 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_NUM, KC_PSLS, KC_PAST, KC_PMNS,
+ 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_P7, KC_P8, KC_P9, KC_PPLS,
+ 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_P4, KC_P5, KC_P6, KC_PEQL,
+ KC_LSFT, KC_GRV, KC_Z, KC_X, KC_C, KC_V, KC_B, KC_N, KC_M, KC_COMM, KC_DOT, KC_SLSH, KC_RSFT, KC_BSLS, KC_UP, KC_P1, KC_P2, KC_P3, KC_PENT,
+ KC_LCTL, KC_LALT, KC_LGUI, KC_SPACE, KC_RGUI, KC_RALT, MO(_FN), KC_RCTL, KC_LEFT, KC_DOWN, KC_RGHT, KC_P0, KC_PDOT),
+ [_FN] = LAYOUT_all(
+ _______, 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_VOLU, _______, _______, _______, _______,
+ _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, DF(_PC), _______, _______, _______, _______, KC_MUTE, KC_VOLD, _______, _______, _______, _______,
+ _______, _______, _______, DB_TOGG, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+ _______, _______, _______, _______, _______, _______, QK_BOOT, _______, DF(_MAC),_______, _______, _______, _______, _______, KC_MPLY, _______, _______, _______, _______,
+ _______, _______, _______, _______, _______, _______, _______, KC_APP, KC_MPRV, KC_MSTP, KC_MNXT, _______, _______)
+};
+
+bool process_detected_host_os_user(os_variant_t detected_os) {
+ /* If Apple, swap to macOS layer. */
+ if (detected_os == OS_MACOS || detected_os == OS_IOS) {
+ set_single_default_layer(_MAC);
+ }
+ else /* Else use PC layer */ {
+ set_single_default_layer(_PC);
+ }
+
+ return true;
+}
diff --git a/keyboards/handwired/at101ish/keymaps/osdetect/rules.mk b/keyboards/handwired/at101ish/keymaps/osdetect/rules.mk
new file mode 100644
index 0000000000..64ac3dcb16
--- /dev/null
+++ b/keyboards/handwired/at101ish/keymaps/osdetect/rules.mk
@@ -0,0 +1 @@
+OS_DETECTION_ENABLE = yes
diff --git a/keyboards/handwired/at101ish/readme.md b/keyboards/handwired/at101ish/readme.md
new file mode 100644
index 0000000000..2bdfbb9367
--- /dev/null
+++ b/keyboards/handwired/at101ish/readme.md
@@ -0,0 +1,25 @@
+# AT101(-ish)
+
+A replacement PCB for Dell AT101 family. (In theory) supports AT101, AT101W, AT102, AT102W, maybe other Bigfoot platform boards.
+
+Keyboard Maintainer: QMK Community and Henrik O. Sørensen
+Hardware Supported: AT101(ish) PCB
+Hardware Availability: https://github.com/henrikosorensen/keyboard_pcbs/tree/master/at101_pcb
+
+Make example for this keyboard (after setting up your build environment):
+
+ make handwired/at101ish:default
+
+Flashing example for this keyboard:
+
+ make handwired/at101ish:default:flash
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
+
+## Bootloader
+
+Enter the bootloader in 2 ways:
+
+* **Bootmagic reset**: Hold down the key at (0,0) in the matrix (usually the top left key or Escape) and plug in the keyboard
+* **Physical reset button**: Briefly press the programming button on the teensy 2.0 PCB.
+