diff --git a/keyboards/tronguylabs/m122_3270/blackpill/config.h b/keyboards/tronguylabs/m122_3270/blackpill/config.h
new file mode 100644
index 000000000000..95c94ef318a0
--- /dev/null
+++ b/keyboards/tronguylabs/m122_3270/blackpill/config.h
@@ -0,0 +1,29 @@
+/* Copyright 2021 James R. Maynard III <jaymaynard@gmail.com>
+ *
+ * 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 below
+
+// Blackpill pin assignments: reversed the rows from the Teensy version for easier PCB layout
+// DO NOT USE the following pins: A9 (has pulldown on it), A11/A12 (USB lines), B2 (external pulldown)
+// C13 has an LED, and C13/C14/C15 are best used as inputs (with DIODE_DIRECTION set to ROW2COL, the
+// rows are inputs). Note that every usable I/O pin is used.
+#define MATRIX_COL_PINS { B0, B1, B10, B12, B13, B14, B15, A8, A7, A10, A6, A5, A15, B3, B4, B5, B6, B7, B8, B9 }
+#define MATRIX_ROW_PINS { C13, C14, C15, A0, A1, A2, A3, A4 }
+
+// The BlackPill version is version 2
+#define DEVICE_VER      0x0002
diff --git a/keyboards/tronguylabs/m122_3270/blackpill/readme.md b/keyboards/tronguylabs/m122_3270/blackpill/readme.md
new file mode 100644
index 000000000000..08df795b13a1
--- /dev/null
+++ b/keyboards/tronguylabs/m122_3270/blackpill/readme.md
@@ -0,0 +1,2 @@
+# BlackPill controller for m122-3270
+This directory contains the BlackPill-specific definitions for the M122-3270 keyboard.
diff --git a/keyboards/tronguylabs/m122_3270/blackpill/rules.mk b/keyboards/tronguylabs/m122_3270/blackpill/rules.mk
new file mode 100644
index 000000000000..d3daefaebeb8
--- /dev/null
+++ b/keyboards/tronguylabs/m122_3270/blackpill/rules.mk
@@ -0,0 +1,7 @@
+# Overrides for the Blackpill version
+
+# MCU name
+MCU = STM32F411
+
+# Bootloader selection
+BOOTLOADER = stm32-dfu
diff --git a/keyboards/tronguylabs/m122_3270/config.h b/keyboards/tronguylabs/m122_3270/config.h
new file mode 100644
index 000000000000..0dd0187a1a4f
--- /dev/null
+++ b/keyboards/tronguylabs/m122_3270/config.h
@@ -0,0 +1,71 @@
+/* Copyright 2021 James R. Maynard III <jaymaynard@gmail.com>
+ *
+ * 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"
+
+#define VENDOR_ID       0x1209
+#define PRODUCT_ID      0x3270
+// DEVICE_VER is defined in each variant's config.h file
+#define MANUFACTURER    IBM
+#define PRODUCT         Model M PC/3270 122 key
+
+// Both controllers draw 100 mA or less
+#define USB_MAX_POWER_CONSUMPTION 100
+
+/* key matrix size */
+#define MATRIX_ROWS 8
+#define MATRIX_COLS 20
+
+/*
+ * Keyboard Matrix Assignments
+ *
+ * Change this to how you wired your keyboard
+ * DIODE_DIRECTION: COL2ROW = COL = Anode (+), ROW = Cathode (-, marked on diode)
+ *                  ROW2COL = ROW = Anode (+), COL = Cathode (-, marked on diode)
+ *
+*/
+#define UNUSED_PINS
+
+/* COL2ROW, ROW2COL*/
+#define DIODE_DIRECTION ROW2COL
+
+/* Debounce reduces chatter (unintended double-presses) - set 0 if debouncing is not needed */
+#define DEBOUNCE 15
+
+/* If defined, GRAVE_ESC will always act as ESC when CTRL is held.
+ * This is userful for the Windows task manager shortcut (ctrl+shift+esc).
+ */
+// #define GRAVE_ESC_CTRL_OVERRIDE
+
+/*
+ * 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/tronguylabs/m122_3270/info.json b/keyboards/tronguylabs/m122_3270/info.json
new file mode 100644
index 000000000000..fd158eb46b24
--- /dev/null
+++ b/keyboards/tronguylabs/m122_3270/info.json
@@ -0,0 +1,134 @@
+{
+  "keyboard_name": "IBM Model M PC/3270 122 key",
+  "maintainer": "jmaynard",
+  "width": 24.75,
+  "height": 8,
+  "layouts": {
+    "LAYOUT": {
+      "layout": [
+        {"label":"F13", "x":3.25, "y":0},
+        {"label":"F14", "x":4.25, "y":0},
+        {"label":"F15", "x":5.25, "y":0},
+        {"label":"F16", "x":6.25, "y":0},
+        {"label":"F17", "x":7.25, "y":0},
+        {"label":"F18", "x":8.25, "y":0},
+        {"label":"F19", "x":9.25, "y":0},
+        {"label":"F20", "x":10.25, "y":0},
+        {"label":"F21", "x":11.25, "y":0},
+        {"label":"F22", "x":12.25, "y":0},
+        {"label":"F23", "x":13.25, "y":0},
+        {"label":"F24", "x":14.25, "y":0},
+        {"label":"F1", "x":3.25, "y":1},
+        {"label":"F2", "x":4.25, "y":1},
+        {"label":"F3", "x":5.25, "y":1},
+        {"label":"F4", "x":6.25, "y":1},
+        {"label":"F5", "x":7.25, "y":1},
+        {"label":"F6", "x":8.25, "y":1},
+        {"label":"F7", "x":9.25, "y":1},
+        {"label":"F8", "x":10.25, "y":1},
+        {"label":"F9", "x":11.25, "y":1},
+        {"label":"F10", "x":12.25, "y":1},
+        {"label":"F11", "x":13.25, "y":1},
+        {"label":"F12", "x":14.25, "y":1},
+        {"label":"Esc", "x":0, "y":3},
+        {"x":1, "y":3},
+        {"label":"`", "x":2.25, "y":3},
+        {"label":"1", "x":3.25, "y":3},
+        {"label":"2", "x":4.25, "y":3},
+        {"label":"3", "x":5.25, "y":3},
+        {"label":"4", "x":6.25, "y":3},
+        {"label":"5", "x":7.25, "y":3},
+        {"label":"6", "x":8.25, "y":3},
+        {"label":"7", "x":9.25, "y":3},
+        {"label":"8", "x":10.25, "y":3},
+        {"label":"9", "x":11.25, "y":3},
+        {"label":"0", "x":12.25, "y":3},
+        {"label":"-", "x":13.25, "y":3},
+        {"label":"=", "x":14.25, "y":3},
+        {"label":"Backspace", "x":15.25, "y":3, "w":2},
+        {"label":"Insert", "x":17.5, "y":3},
+        {"label":"Home", "x":18.5, "y":3},
+        {"label":"Page Up", "x":19.5, "y":3},
+        {"label":"Num Lock", "x":20.75, "y":3},
+        {"label":"/", "x":21.75, "y":3},
+        {"label":"*", "x":22.75, "y":3},
+        {"label":"-", "x":23.75, "y":3},
+        {"x":0, "y":4},
+        {"x":1, "y":4},
+        {"label":"Tab", "x":2.25, "y":4, "w":1.5},
+        {"label":"Q", "x":3.75, "y":4},
+        {"label":"W", "x":4.75, "y":4},
+        {"label":"E", "x":5.75, "y":4},
+        {"label":"R", "x":6.75, "y":4},
+        {"label":"T", "x":7.75, "y":4},
+        {"label":"Y", "x":8.75, "y":4},
+        {"label":"U", "x":9.75, "y":4},
+        {"label":"I", "x":10.75, "y":4},
+        {"label":"O", "x":11.75, "y":4},
+        {"label":"P", "x":12.75, "y":4},
+        {"label":"[", "x":13.75, "y":4},
+        {"label":"]", "x":14.75, "y":4},
+        {"label":"Enter", "x":16, "y":4, "w":1.25, "h":2},
+        {"label":"Delete", "x":17.5, "y":4},
+        {"label":"End", "x":18.5, "y":4},
+        {"label":"Page Down", "x":19.5, "y":4},
+        {"label":"7", "x":20.75, "y":4},
+        {"label":"8", "x":21.75, "y":4},
+        {"label":"9", "x":22.75, "y":4},
+        {"label":"+", "x":23.75, "y":4},
+        {"x":0, "y":5},
+        {"x":1, "y":5},
+        {"label":"Caps Lock", "x":2.25, "y":5, "w":1.75},
+        {"label":"A", "x":4, "y":5},
+        {"label":"S", "x":5, "y":5},
+        {"label":"D", "x":6, "y":5},
+        {"label":"F", "x":7, "y":5},
+        {"label":"G", "x":8, "y":5},
+        {"label":"H", "x":9, "y":5},
+        {"label":"J", "x":10, "y":5},
+        {"label":"K", "x":11, "y":5},
+        {"label":"L", "x":12, "y":5},
+        {"label":";", "x":13, "y":5},
+        {"label":"'", "x":14, "y":5},
+        {"label":"#", "x":15, "y":5},
+        {"label":"Up", "x":18.5, "y":5},
+        {"label":"4", "x":20.75, "y":5},
+        {"label":"5", "x":21.75, "y":5},
+        {"label":"6", "x":22.75, "y":5},
+        {"x":23.75, "y":5},
+        {"x":0, "y":6},
+        {"x":1, "y":6},
+        {"label":"Shift", "x":2.25, "y":6, "w":1.25},
+        {"label":"\\", "x":3.5, "y":6},
+        {"label":"Z", "x":4.5, "y":6},
+        {"label":"X", "x":5.5, "y":6},
+        {"label":"C", "x":6.5, "y":6},
+        {"label":"V", "x":7.5, "y":6},
+        {"label":"B", "x":8.5, "y":6},
+        {"label":"N", "x":9.5, "y":6},
+        {"label":"M", "x":10.5, "y":6},
+        {"label":",", "x":11.5, "y":6},
+        {"label":".", "x":12.5, "y":6},
+        {"label":"/", "x":13.5, "y":6},
+        {"label":"Shift", "x":14.5, "y":6, "w":2.75},
+        {"label":"Left", "x":17.5, "y":6},
+        {"x":18.5, "y":6},
+        {"label":"Right", "x":19.5, "y":6},
+        {"label":"1", "x":20.75, "y":6},
+        {"label":"2", "x":21.75, "y":6},
+        {"label":"3", "x":22.75, "y":6},
+        {"label":"Enter", "x":23.75, "y":6, "h":2},
+        {"x":0, "y":7},
+        {"x":1, "y":7},
+        {"label":"Ctrl", "x":2.25, "y":7, "w":1.5},
+        {"label":"Alt", "x":4.75, "y":7, "w":1.5},
+        {"x":6.25, "y":7, "w":7},
+        {"label":"AltGr", "x":13.25, "y":7, "w":1.5},
+        {"label":"Ctrl", "x":15.75, "y":7, "w":1.5},
+        {"label":"Down", "x":18.5, "y":7},
+        {"label":"0", "x":20.75, "y":7, "w":2},
+        {"label":".", "x":22.75, "y":7}
+      ]
+    }
+  }
+}
diff --git a/keyboards/tronguylabs/m122_3270/keymaps/default/keymap.c b/keyboards/tronguylabs/m122_3270/keymaps/default/keymap.c
new file mode 100644
index 000000000000..a79d3c637248
--- /dev/null
+++ b/keyboards/tronguylabs/m122_3270/keymaps/default/keymap.c
@@ -0,0 +1,193 @@
+/* Copyright 2021 James R. Maynard III <jaymaynard@gmail.com>
+ *
+ * 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_keycodes {
+    JM_DOT = SAFE_RANGE, // . both shifted and unshifted
+    JM_COMM,      // , both shifted and unshifted
+    JM_GRLS,      // < and > on one key
+    JM_CBRC,      // { and } on one key
+    JM_CENT,      // cent sign and ! on one key
+    JM_JUMP,      // JUMP/PA3,
+    JM_DEL        // Delete
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+  // PC/3270 layout: PC legends (blue)
+    [0] = LAYOUT(
+                          KC_F13,  KC_F14,  KC_F15, KC_F16, KC_F17, KC_F18, KC_F19, KC_F20, KC_F21, KC_F22,  KC_F23,  KC_F24,
+                          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_NO,   KC_NO,   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_ESC,  KC_PGUP, KC_PGDN,    KC_NLCK, KC_SLCK, KC_PAST, KC_PSLS,
+        KC_NO,   KC_PAUS, 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_ENT,    KC_END,  KC_INS,  KC_DEL,     KC_P7,   KC_P8,   KC_P9,   KC_PPLS,
+        KC_NO,   KC_NO,   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_BSLS,                     KC_UP,               KC_P4,   KC_P5,   KC_P6,   KC_PMNS,
+        KC_PSCR, KC_NO,   KC_LSFT, JM_GRLS, KC_Z,   KC_X,   KC_C,   KC_V,   KC_B,   KC_N,   KC_M,   KC_COMM, KC_DOT,  KC_SLSH, KC_RSFT,            KC_LEFT, KC_HOME, KC_RIGHT,   KC_P1,   KC_P2,   KC_P3,   KC_PENT,
+        MO(10),  KC_LGUI, KC_LCTL, KC_LALT,                                        KC_SPC,                            KC_RALT, KC_RCTL,                     KC_DOWN,             KC_P0,            KC_PDOT
+    ),
+
+ // PC/3270 layout: 3270 legends (black), with x3270 keycodes
+    [1] = LAYOUT(
+                           A(KC_F1), A(KC_F2), A(KC_F3), A(KC_F4), A(KC_F5), A(KC_F6), A(KC_F7), A(KC_F8), A(KC_F9), A(KC_F10), A(KC_F11), A(KC_F12),
+                           KC_F1,    KC_F2,    KC_F3,    KC_F4,    KC_F5,    KC_F6,    KC_F7,    KC_F8,    KC_F9,    KC_F10,    KC_F11,    KC_F12,
+        A(KC_A),  A(KC_C), 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,   A(KC_1),   A(KC_2), JM_JUMP,    KC_NO,   KC_NO,   KC_PCMM, KC_SPC,
+        KC_CRSEL, KC_PAUS, KC_TAB,   KC_Q,     KC_W,     KC_E,     KC_R,     KC_T,     KC_Y,     KC_U,     KC_I,     KC_O,      KC_P,      JM_CENT,   KC_BSLS, S(KC_ENT), S(KC_TAB), KC_INS,  JM_DEL,     KC_P7,   KC_P8,   KC_P9,   KC_TAB,
+        KC_EXSEL, A(KC_E), KC_CAPS,  KC_A,     KC_S,     KC_D,     KC_F,     KC_G,     KC_H,     KC_J,     KC_K,     KC_L,      KC_SCLN,   KC_QUOT,   JM_CBRC,                       KC_UP,               KC_P4,   KC_P5,   KC_P6,   KC_PMNS,
+        A(KC_B),  C(KC_C), KC_LSFT,  JM_GRLS,  KC_Z,     KC_X,     KC_C,     KC_V,     KC_B,     KC_N,     KC_M,     JM_COMM,   JM_DOT,    KC_SLSH,   KC_RSFT,            KC_LEFT,   A(KC_H), KC_RIGHT,   KC_P1,   KC_P2,   KC_P3,   KC_PENT,
+        MO(10),   KC_LGUI, A(KC_R),  KC_LALT,                                                   KC_SPC,                                    KC_RALT,   KC_ENT,                        KC_DOWN,             KC_P0,            KC_PDOT
+    ),
+
+// Function layer, accessed by the Zoom key
+    [10] = LAYOUT(
+                            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,
+        DF(0),    DF(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, 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, 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, KC_TRNS,   KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
+        KC_TRNS,  KC_TRNS,  KC_TRNS, KC_TRNS,                                              MO(11),                             KC_TRNS, KC_TRNS,                    KC_TRNS,            KC_TRNS,          KC_TRNS
+    ),
+
+// Firmware layer, accessed by the Zoom/Space key pair (hold both down)
+    [11] = LAYOUT(
+                            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, 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, EEP_RST, RESET,   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, DEBUG,   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, 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
+    ),
+};
+
+bool left_shift_down = false;
+bool right_shift_down = false;
+bool left_alt_down = false;
+bool right_alt_down = false;
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+    switch (keycode) {
+        case KC_LSHIFT:
+        if (record->event.pressed) {
+            left_shift_down = true;
+        return true;
+        } else {
+            left_shift_down = false;
+            return true;
+        }
+        break;
+        case KC_RSHIFT:
+        if (record->event.pressed) {
+            right_shift_down = true;
+            return true;
+        } else {
+            right_shift_down = false;
+            return true;
+        }
+        break;
+        case KC_LALT:
+        if (record->event.pressed) {
+            left_alt_down = true;
+            return true;
+        } else {
+            left_alt_down = false;
+            return true;
+        }
+        break;
+        case KC_RALT:
+        if (record->event.pressed) {
+            right_alt_down = true;
+            return true;
+        } else {
+            right_alt_down = false;
+            return true;
+        }
+        break;
+        case JM_GRLS:
+        if (left_shift_down || right_shift_down) {
+            if(record->event.pressed) {
+                SEND_STRING(">");
+            }
+            return false;
+        } else {
+            if(record->event.pressed) {
+                SEND_STRING("<");
+            }
+            return false;
+        }
+        break;
+        case JM_CBRC:
+        if (left_shift_down || right_shift_down) {
+            if (record->event.pressed) {
+                SEND_STRING("}");
+            }
+            return false;
+        } else {
+            if(record->event.pressed) {
+                SEND_STRING("{");
+            }
+            return false;
+        }
+        break;
+        case JM_CENT:
+        if (left_shift_down || right_shift_down) {
+            if (record->event.pressed) {
+                SEND_STRING("!");
+            }
+            return false;
+        } else {
+            if (record->event.pressed) {
+                SEND_STRING("<");  // TODO: what does tn3270 want for a cent sign?
+            }
+            return false;
+        }
+        break;
+        case JM_COMM:
+        if (record->event.pressed){
+            SEND_STRING(",");
+        }
+        return false;
+        case JM_DOT:
+        if (record->event.pressed) {
+            SEND_STRING(".");
+        }
+        return false;
+        case JM_JUMP:
+        if (record->event.pressed) {
+            if (left_alt_down || right_alt_down) {
+                SEND_STRING("3");
+            }
+        }
+        return false;
+        case JM_DEL:
+        if (record->event.pressed) {
+            if (left_alt_down || right_alt_down) {
+                unregister_code(KC_LALT);
+                unregister_code(KC_RALT);
+                tap_code16(C(KC_W));
+                if (left_alt_down) {
+                    register_code(KC_LALT);
+                }
+                if (right_alt_down) {
+                    register_code(KC_RALT);
+                }
+            } else {
+                tap_code16(KC_DEL);
+            }
+        }
+        return false;
+    }
+
+    return true;
+}
diff --git a/keyboards/tronguylabs/m122_3270/keymaps/default/readme.md b/keyboards/tronguylabs/m122_3270/keymaps/default/readme.md
new file mode 100644
index 000000000000..befa267fa142
--- /dev/null
+++ b/keyboards/tronguylabs/m122_3270/keymaps/default/readme.md
@@ -0,0 +1,23 @@
+# Default keymap for m122-3270
+This keymap is intended to make the PC/3270 122-key IBM keyboard work as closely as possible to the standard
+PC/3270 keyboard's original mapping. Two layers are defined: layer 0 is the PC layout, using the blue legends
+on the PC/3270 keys (as shipped by Unicomp; I don't have the original keycaps, and I know there are a few
+differences), while layer 1 is the 3270 layout, with keycodes selected to make the x3270 suite do the right
+thing with each key as pressed. The idea here is, eventually, to get x3270 and friends to automatically
+shift the keyboard to layer 1 when they gain focus.
+
+When layer 0 is active, the PA1 key is Escape, the Reset and Enter keys are Control, and the comma and dot keys
+act like normal PC keys (< and >, repectively, when shifted). The Ctrl key (bottom right of the left-side 10-key
+cluster) is always the left GUI key. PA2 and Jump/PA3 are PgUp and PgDn, respectively, and the backtab key is
+End. The Rule/Home key is Home.
+
+When layer 1 is active, the keys do their labeled functions. The only keys that don't do anything are CrSel,
+ExSel, and Jump, though only a few of the alternate functions (on the front of the keys) work: left/right/delete
+word and PA3. The rest aren't emulated by x3270. Many of the keys that have function in PC mode will *not* have
+that same function in 3270 mode, since x3270 uses different keystrokes to accomplish the same function.
+
+To manually switch to layer 1, hold the Zoom key (the one on the far lower left of the keyboard) and press Clear
+(the one at the top right of that same block of 10 keys); to switch back to layer 0, hold the Zoom key and hit
+Attn (the one at the top left of that block of 10). Holding the Zoom key and the spacebar gets you to keys that
+control QMK itself: Zoom-space-R resets to the bootloader, Zoom-space-E erases the EEPROM (which currently does
+nothing), and Zoom-space-D turns the debugger on and off.
diff --git a/keyboards/tronguylabs/m122_3270/m122_3270.c b/keyboards/tronguylabs/m122_3270/m122_3270.c
new file mode 100644
index 000000000000..b206d66ae070
--- /dev/null
+++ b/keyboards/tronguylabs/m122_3270/m122_3270.c
@@ -0,0 +1,16 @@
+/* Copyright 2021 James R. Maynard III
+ *
+ * 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 "m122_3270.h"
diff --git a/keyboards/tronguylabs/m122_3270/m122_3270.h b/keyboards/tronguylabs/m122_3270/m122_3270.h
new file mode 100644
index 000000000000..71ccf7b66bdc
--- /dev/null
+++ b/keyboards/tronguylabs/m122_3270/m122_3270.h
@@ -0,0 +1,40 @@
+/* Copyright 2021 James R. Maynard III
+ *
+ * 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 all of the arguments
+// The second converts the arguments into a two-dimensional array
+#define LAYOUT( \
+                k09, k19, k1A, k29, k39, k3A, k49, k59, k5A, k69, k79, k7A,                                                  \
+                k0A, k0B, k1B, k2A, k2B, k3B, k4A, k4B, k5B, k6A, k6B, k7B,                                                  \
+    k31, k32,   k34, k24, k25, k26, k27, k37, k38, k28, k2C, k2D, k2E, k3E, k3C, k3F,   k3G, k3H, k2G,   k2F, k2H, k2I, k20, \
+    k21, k41,   k42, k44, k45, k46, k47, k57, k58, k48, k4C, k4D, k4E, k5E, k5C, k6F,   k1G, k5G, k4G,   k4F, k4H, k4I, k40, \
+    k51, k52,   k62, k14, k15, k16, k17, k07, k08, k18, k1C, k1D, k1E, k0E, k6E,             k0G,        k1F, k1H, k1I, k10, \
+    k11, k12,   k73, k74, k64, k65, k66, k67, k77, k78, k68, k6C, k6D, k7E,      k63,   k60, k0J, k1J,   k61, k6H, k6I, k7J, \
+    k02, k01,   k00,    k70,                k71,             k03,      k72,                  k0F,        k7H,      k7I       \
+) \
+{ \
+    {   k00,   k01,   k02,   k03,   KC_NO, KC_NO, KC_NO, k07,   k08,   k09,   k0A,   k0B,   KC_NO, KC_NO, k0E,   k0F,   k0G,   KC_NO, KC_NO, k0J   }, \
+    {   k10,   k11,   k12,   KC_NO, k14,   k15,   k16,   k17,   k18,   k19,   k1A,   k1B,   k1C,   k1D,   k1E,   k1F,   k1G,   k1H,   k1I,   k1J   }, \
+    {   k20,   k21,   KC_NO, KC_NO, k24,   k25,   k26,   k27,   k28,   k29,   k2A,   k2B,   k2C,   k2D,   k2E,   k2F,   k2G,   k2H,   k2I,   KC_NO }, \
+    {   KC_NO, k31,   k32,   KC_NO, k34,   KC_NO, KC_NO, k37,   k38,   k39,   k3A,   k3B,   k3C,   KC_NO, k3E,   k3F,   k3G,   k3H,   KC_NO, KC_NO }, \
+    {   k40,   k41,   k42,   KC_NO, k44,   k45,   k46,   k47,   k48,   k49,   k4A,   k4B,   k4C,   k4D,   k4E,   k4F,   k4G,   k4H,   k4I,   KC_NO }, \
+    {   KC_NO, k51,   k52,   KC_NO, KC_NO, KC_NO, KC_NO, k57,   k58,   k59,   k5A,   k5B,   k5C,   KC_NO, k5E,   KC_NO, k5G,   KC_NO, KC_NO, KC_NO }, \
+    {   k60,   k61,   k62,   k63,   k64,   k65,   k66,   k67,   k68,   k69,   k6A,   k6B,   k6C,   k6D,   k6E,   k6F,   KC_NO, k6H,   k6I,   KC_NO }, \
+    {   k70,   k71,   k72,   k73,   k74,   KC_NO, KC_NO, k77,   k78,   k79,   k7A,   k7B,   KC_NO, KC_NO, k7E,   KC_NO, KC_NO, k7H,   k7I,   k7J   }, \
+}
diff --git a/keyboards/tronguylabs/m122_3270/readme.md b/keyboards/tronguylabs/m122_3270/readme.md
new file mode 100644
index 000000000000..b8de846789b1
--- /dev/null
+++ b/keyboards/tronguylabs/m122_3270/readme.md
@@ -0,0 +1,27 @@
+# m122-3270
+
+![IBM Model M 122 key](https://i.imgur.com/Oo3Ozqzh.jpg)
+
+This is a replacement controller for the IBM Model M 122 key terminal keyboard running on a STM32F411 BlackPill, intended
+to act as closely to the 3270 keyboard's functioning as possible while still being usable on a PC.
+
+* Keyboard Maintainer: [Jay Maynard](https://github.com/jmaynard)
+* Hardware Supported: BlackPill STM32F411, Teensy++ 2.0
+* Hardware Availability: [BlackPill](https://www.adafruit.com/product/4877), [Teensy](https://www.pjrc.com/store/teensypp.html)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make tronguylabs/m122_3270/blackpill:default
+    make tronguylabs/m122_3270/teensy:default
+
+See [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) then the
+[make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information.
+
+A schematic and Gerber files are publicly available for those wishing to have carrier boards made
+professionally instead of handwiring things. The M122 matrix connectors plug right into it. It can
+be found at https://github.com/jmaynard/tronguylabs-m122-blackpill .
+
+This is derived from Luke Stanley's handwired/ibm122m keyboard, with my own keymapping and
+rework of the I/O for the BlackPill. There's also a version for the Teensy++ 2.0, since that
+was my original design and I still use one on one board, even though I switched to the
+BlackPill for future-proofing. The Teensy++ 2.0 is not recommended for new designs.
diff --git a/keyboards/tronguylabs/m122_3270/rules.mk b/keyboards/tronguylabs/m122_3270/rules.mk
new file mode 100644
index 000000000000..2604f4818b34
--- /dev/null
+++ b/keyboards/tronguylabs/m122_3270/rules.mk
@@ -0,0 +1,16 @@
+# Build Options
+#   change yes to no to disable
+#
+BOOTMAGIC_ENABLE = no       # Virtual DIP switch configuration
+MOUSEKEY_ENABLE = yes       # Mouse keys
+EXTRAKEY_ENABLE = yes       # Audio control and System control
+CONSOLE_ENABLE = yes        # Console for debug
+COMMAND_ENABLE = yes        # Commands for debug and configuration
+# Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
+SLEEP_LED_ENABLE = no       # Breathing sleep LED during USB suspend
+# if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
+NKRO_ENABLE = yes           # USB Nkey Rollover
+BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
+RGBLIGHT_ENABLE = no        # Enable keyboard RGB underglow
+BLUETOOTH_ENABLE = no       # Enable Bluetooth
+AUDIO_ENABLE = no           # Audio output
diff --git a/keyboards/tronguylabs/m122_3270/teensy/config.h b/keyboards/tronguylabs/m122_3270/teensy/config.h
new file mode 100644
index 000000000000..c23c5931eba0
--- /dev/null
+++ b/keyboards/tronguylabs/m122_3270/teensy/config.h
@@ -0,0 +1,27 @@
+/* Copyright 2021 James R. Maynard III <jaymaynard@gmail.com>
+ *
+ * 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 below
+
+// Teensy pin assignments: I'm wiring things a bit more straightforwardly, and
+//    avoiding the LED on PD6
+#define MATRIX_COL_PINS { B5, B6, B7, D0, D1, D2, D3, D4, D5, D7, E0, E1, C0, C1, C2, C3, C4, C5, C6, C7 }
+#define MATRIX_ROW_PINS { F0, F1, F2, F3, F4, F5, F6, F7 }
+
+// The Teensy version is version 1
+#define DEVICE_VER      0x0001
diff --git a/keyboards/tronguylabs/m122_3270/teensy/readme.md b/keyboards/tronguylabs/m122_3270/teensy/readme.md
new file mode 100644
index 000000000000..99946d746dde
--- /dev/null
+++ b/keyboards/tronguylabs/m122_3270/teensy/readme.md
@@ -0,0 +1,2 @@
+# Teensy controller for m122-3270
+This directory contains the Teensy++ 2.0-specific definitions for the M122-3270 keyboard.
diff --git a/keyboards/tronguylabs/m122_3270/teensy/rules.mk b/keyboards/tronguylabs/m122_3270/teensy/rules.mk
new file mode 100644
index 000000000000..2919fdedfa9a
--- /dev/null
+++ b/keyboards/tronguylabs/m122_3270/teensy/rules.mk
@@ -0,0 +1,7 @@
+# Overrides for the Teensy version
+
+# MCU name
+MCU = at90usb1286
+
+# Bootloader selection
+BOOTLOADER = halfkay