diff --git a/Config.h b/Config.h
index f7b8d62..4e7142d 100644
--- a/Config.h
+++ b/Config.h
@@ -24,6 +24,8 @@
 // #define PI_HAT_7021_REV_03
 // 2) ZUMspot Libre Kit or board with modified RF7021SE and Blue Pill STM32F103:
 #define ADF7021_CARRIER_BOARD
+// 3) MMDVM_HS_Hat revisions 1.1 and 1.2 (DB9MAT & DF2ET)
+// #define MMDVM_HS_HAT_REV12
 
 // Enable ADF7021 support:
 #define ENABLE_ADF7021
diff --git a/IOArduino.cpp b/IOArduino.cpp
index e8aa67f..ee258b2 100644
--- a/IOArduino.cpp
+++ b/IOArduino.cpp
@@ -50,7 +50,7 @@
 #define PIN_PTT_LED    PB14
 #define PIN_COS_LED    PB15
 
-#elif defined(ADF7021_CARRIER_BOARD)
+#elif defined(ADF7021_CARRIER_BOARD) || defined(MMDVM_HS_HAT_REV12)
 
 #define PIN_SCLK       PB5
 #define PIN_SREAD      PB7
@@ -73,7 +73,7 @@
 #define PIN_COS_LED    PB15
 
 #else
-#error "Either PI_HAT_7021_REV_03 or ADF7021_CARRIER_BOARD need to be defined"
+#error "Either PI_HAT_7021_REV_03 or ADF7021_CARRIER_BOARD or MMDVM_HS_HAT_REV12 need to be defined"
 #endif
 
 #elif defined(__MK20DX256__) || defined(__MK64FX512__) || defined(__MK66FX1M0__)
@@ -144,7 +144,7 @@ void CIO::Init()
 {
 #if defined (__STM32F1__)
 
-#if defined(PI_HAT_7021_REV_03) || defined(ADF7021_CARRIER_BOARD)
+#if defined(PI_HAT_7021_REV_03) || defined(ADF7021_CARRIER_BOARD) || defined(MMDVM_HS_HAT_REV12)
   afio_cfg_debug_ports(AFIO_DEBUG_SW_ONLY);
 #endif
 
diff --git a/IOSTM.cpp b/IOSTM.cpp
index e99f583..fe1fb03 100644
--- a/IOSTM.cpp
+++ b/IOSTM.cpp
@@ -146,7 +146,7 @@
 #define PIN_COS_LED          GPIO_Pin_15
 #define PORT_COS_LED         GPIOB
 
-#elif defined(ADF7021_CARRIER_BOARD)
+#elif defined(ADF7021_CARRIER_BOARD) || defined(MMDVM_HS_HAT_REV12)
 
 #define PIN_SCLK             GPIO_Pin_5
 #define PORT_SCLK            GPIOB
@@ -216,7 +216,7 @@
 #define PORT_COS_LED         GPIOB
 
 #else
-#error "Either PI_HAT_7021_REV_02, PI_HAT_7021_REV_03 or ADF7021_CARRIER_BOARD need to be defined"
+#error "Either PI_HAT_7021_REV_02, PI_HAT_7021_REV_03,ADF7021_CARRIER_BOARD or MMDVM_HS_HAT_REV12 need to be defined"
 #endif
 
 extern "C" {
@@ -238,7 +238,7 @@ extern "C" {
   }
 #endif
 
-#elif defined(PI_HAT_7021_REV_03) || defined(ADF7021_CARRIER_BOARD)
+#elif defined(PI_HAT_7021_REV_03) || defined(ADF7021_CARRIER_BOARD) || defined(MMDVM_HS_HAT_REV12)
 
 #if defined(BIDIR_DATA_PIN)
   void EXTI3_IRQHandler(void) {
@@ -275,7 +275,7 @@ void CIO::Init()
   
 #if defined(PI_HAT_7021_REV_02)
   GPIO_PinRemapConfig(GPIO_Remap_SWJ_Disable, ENABLE);
-#elif defined(PI_HAT_7021_REV_03) || defined(ADF7021_CARRIER_BOARD)
+#elif defined(PI_HAT_7021_REV_03) || defined(ADF7021_CARRIER_BOARD) || defined(MMDVM_HS_HAT_REV12)
   GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable, ENABLE);
 #endif
 
@@ -439,7 +439,7 @@ void CIO::Init()
   EXTI_InitStructure.EXTI_Line = EXTI_Line14;
 #endif
 
-#elif defined(PI_HAT_7021_REV_03) || defined(ADF7021_CARRIER_BOARD)
+#elif defined(PI_HAT_7021_REV_03) || defined(ADF7021_CARRIER_BOARD) || defined(MMDVM_HS_HAT_REV12)
 
 #if defined(BIDIR_DATA_PIN)
   // Connect EXTI3 Line
@@ -487,7 +487,7 @@ void CIO::startInt()
 
   NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQn;
 
-#elif defined(PI_HAT_7021_REV_03) || defined(ADF7021_CARRIER_BOARD)
+#elif defined(PI_HAT_7021_REV_03) || defined(ADF7021_CARRIER_BOARD) || defined(MMDVM_HS_HAT_REV12)
 
 #if defined(BIDIR_DATA_PIN)
   // Enable and set EXTI3 Interrupt
diff --git a/Makefile b/Makefile
index 7432318..e61c748 100644
--- a/Makefile
+++ b/Makefile
@@ -377,6 +377,8 @@ ifneq ($(wildcard /usr/bin/stm32flash),)
 	/usr/bin/stm32flash -v -w bin/$(BINBIN_F1) -g 0x0 -R -i 20,-21,21:-20,21 /dev/ttyAMA0
 endif
 
+mmdvm_hs_hat: zumspot-pi
+
 dfu:
 ifdef devser
 	$(DFU_RST) $(devser) 750