diff --git a/tmk_core/protocol/adb.c b/tmk_core/protocol/adb.c
index e774680d..0b66da7b 100644
--- a/tmk_core/protocol/adb.c
+++ b/tmk_core/protocol/adb.c
@@ -104,6 +104,12 @@ void adb_mouse_task(void) {
 }
 #endif
 
+static bool adb_srq = false;
+bool adb_service_request(void)
+{
+    return adb_srq;
+}
+
 // This sends Talk command to read data from register and returns length of the data.
 uint8_t adb_host_talk_buf(uint8_t addr, uint8_t reg, uint8_t *buf, uint8_t len)
 {
@@ -157,6 +163,7 @@ uint8_t adb_host_talk_buf(uint8_t addr, uint8_t reg, uint8_t *buf, uint8_t len)
     // portion of the stop bit of any command or data transaction. The device must lengthen
     // the stop by a minimum of 140 J.lS beyond its normal duration, as shown in Figure 8-15."
     // http://ww1.microchip.com/downloads/en/AppNotes/00591b.pdf
+    if (!data_in()) { adb_srq = true; } else { adb_srq = false; }
     if (!wait_data_hi(500)) {    // Service Request(310us Adjustable Keyboard): just ignored
         xprintf("R");
         sei();
@@ -227,7 +234,8 @@ void adb_host_listen_buf(uint8_t addr, uint8_t reg, uint8_t *buf, uint8_t len)
     attention();
     send_byte((addr<<4) | ADB_CMD_LISTEN | reg);
     place_bit0();               // Stopbit(0)
-    // TODO: Service Request
+    if (!data_in()) { adb_srq = true; } else { adb_srq = false; }
+    wait_data_hi(500);          // Service Request
     _delay_us(200);             // Tlt/Stop to Start
     place_bit1();               // Startbit(1)
     for (int8_t i = 0; i < len; i++) {
diff --git a/tmk_core/protocol/adb.h b/tmk_core/protocol/adb.h
index 1c1ace5d..914f1085 100644
--- a/tmk_core/protocol/adb.h
+++ b/tmk_core/protocol/adb.h
@@ -121,6 +121,7 @@ void     adb_host_kbd_led(uint8_t addr, uint8_t led);
 void     adb_mouse_task(void);
 void     adb_mouse_init(void);
 uint8_t  adb_mouse_buttons(void);
+bool     adb_service_request(void);
 
 
 #endif