diff --git a/src/hirsute.c b/src/hirsute.c
index f2722e1..66e93ed 100644
--- a/src/hirsute.c
+++ b/src/hirsute.c
@@ -17,6 +17,7 @@
 #include <string.h>
 
 #include "config.h"
+#include "keymap.h"
 #include "pico/stdlib.h"
 #include "pico/util/queue.h"
 #include "pico/multicore.h"
@@ -34,6 +35,7 @@ void holdForEnable();
 uint8_t readCommand();
 void sendByte(uint8_t payload);
 void sendNextKey();
+void transmitKey(uint8_t key);
 
 queue_t key_queue;
 
@@ -143,10 +145,26 @@ void sendNextKey() {
   while (time_us_64() - startTime < 250000) { // 250ms timeout
     uint8_t key;
     if (queue_try_remove(&key_queue, &key)) {
-      sendByte(key); // TODO: Replace with mac-plus-ps2's sendKey()
+      transmitKey(key); // TODO: Replace with mac-plus-ps2's sendKey()
       return;
     }
     sleep_us(2);
   }
   sendByte(NULL_TRANSITION); // Send null transition if no key is available
 }
+
+void transmitKey(uint8_t key) {
+  if (key & 0x0100){
+    sendByte(0x79);
+    readCommand();
+    sendByte(key);
+  } else if (key & 0x0200) {
+    sendByte(0x71);
+    readCommand();
+    sendByte(0x79);
+    readCommand();
+    sendByte(key);
+  } else {
+    sendByte(key);
+  }
+}
diff --git a/src/keymap.h b/src/keymap.h
new file mode 100644
index 0000000..5d746c6
--- /dev/null
+++ b/src/keymap.h
@@ -0,0 +1,33 @@
+#ifndef KEYMAP
+#define KEYMAP
+
+#include <stdlib.h>
+#include <stdint.h>
+
+const uint8_t keymap[29] = {
+    // A     B     C     D     E     F     G     H     I
+    0x01, 0x17, 0x11, 0x05, 0x1D, 0x07, 0x0B, 0x09, 0x45,
+    // J     K     L     M     N     O     P     Q     R
+    0x4D, 0x51, 0x4B, 0x5D, 0x5B, 0x3F, 0x47, 0x19, 0x1F,
+    // S     T     U     V     W     X     Y     Z     [
+    0x03, 0x23, 0x41, 0x13, 0x1B, 0x0F, 0x13, 0x0D, 0x43,
+    // \     ]
+    0x55, 0x3D
+};
+
+const uint8_t numpad[18] = {
+    // 0     1     2     3     4     5     6     7     8
+    0x25, 0x27, 0x29, 0x2B, 0x2D, 0x2F, 0x31, 0x33, 0x35,
+    // 0     .  Enter   ⬇️    ⬆️    ➡️    ⬅️     -  Clear
+    0x39, 0x03, 0x19, 0x11, 0x1B, 0x05, 0x0D, 0x1D, 0x0F
+};
+
+const uint8_t numpad_ascii[18] = {
+    //0    1    2    3    4    5    6    7    8
+    '0', '1', '2', '3', '4', '5', '6', '7', '8',
+    // 9   .  Enter   ⬇️    ⬆️    ➡️    ⬅️     -  Clear
+    '9', '.', 0x0D, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 // TODO: Replace with actual values once known
+};
+
+
+#endif