diff --git a/Makefile b/Makefile
index ff4d184..c06986a 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,7 @@ SDCCOPTS ?= --code-size $(STCCODESIZE) --xram-size 256 --idata-loc 0x80
 #SDCCOPTS ?= --code-size $(STCCODESIZE) --xram-size 256 --stack-auto --model-large
 FLASHFILE ?= main.hex
 LARGE_LDFLAGS += -L/usr/share/sdcc/lib/large/
-# CFLAGS += -DSTACK_DEBUG # write the stack pointer to P3_4
+# CFLAGS += -DSTACK_DEBUG -DSHOW_STACK # write the stack pointer to P3_4
 
 SRC = src/lcd.c src/key.c src/utils.c src/decn/decn.c src/calc.c src/stack_debug.c
 
diff --git a/src/lcd.c b/src/lcd.c
index b5eac5c..c6319b6 100644
--- a/src/lcd.c
+++ b/src/lcd.c
@@ -285,3 +285,15 @@ void LCD_Clear() {
 	col = 0;
 }
 
+void TERMIO_PrintU8(uint8_t x) {
+	uint8_t i;
+	for (i = 2; i; i--) {
+		const uint8_t upper_nibble = (x & 0xf0) >> 4;
+		if (upper_nibble <= 9) {
+			TERMIO_PutChar(upper_nibble + '0');
+		} else {
+			TERMIO_PutChar((upper_nibble - 0x0a) + 'A');
+		}
+		x <<= 4;
+	}
+}
diff --git a/src/lcd.h b/src/lcd.h
index 8002d1f..57d7254 100644
--- a/src/lcd.h
+++ b/src/lcd.h
@@ -31,6 +31,7 @@ void LCD_GoTo(uint8_t row, uint8_t col);
 void LCD_OutString(__xdata const char* string, uint8_t max_chars);
 void LCD_OutString_Initial(__code const char* string);
 short TERMIO_PutChar(unsigned char letter);
+void TERMIO_PrintU8(uint8_t x);
 void LCD_OutNibble(uint8_t x);
 void LCD_ClearToEnd(uint8_t curr_row);
 
diff --git a/src/main.c b/src/main.c
index 613c600..9a2d39f 100644
--- a/src/main.c
+++ b/src/main.c
@@ -523,6 +523,10 @@ int main()
 		//print shifted status
 		if (IsShifted){
 			TERMIO_PutChar('^');
+#if defined(STACK_DEBUG) && defined(SHOW_STACK)
+			TERMIO_PutChar(' ');
+			TERMIO_PrintU8(stack_max);
+#endif
 		}
 
 #ifdef DESKTOP
diff --git a/src/stack_debug.c b/src/stack_debug.c
index eb7da94..ff6139e 100644
--- a/src/stack_debug.c
+++ b/src/stack_debug.c
@@ -84,8 +84,15 @@ stack_debug_3$:
 __endasm;
 }
 
+#if defined(STACK_DEBUG) && defined(SHOW_STACK)
+__xdata uint8_t stack_max = 0x00;
+#endif
+
 void stack_debug(uint8_t marker) {
+#ifdef SHOW_STACK
+	if (SP > stack_max) stack_max = SP;
+#endif
 	stack_debug_write(marker);
 	stack_debug_write(SP);
 }
-#endif // !defined(DESKTOP)
+#endif // defined(STACK_DEBUG)
diff --git a/src/stack_debug.h b/src/stack_debug.h
index a22567e..ef4adcb 100644
--- a/src/stack_debug.h
+++ b/src/stack_debug.h
@@ -35,6 +35,10 @@ void stack_debug_write(uint8_t value) __naked;
 #define stack_debug(marker)
 #endif
 
+#if defined(STACK_DEBUG) && defined(SHOW_STACK)
+extern __xdata uint8_t stack_max;
+#endif
+
 #if defined(DESKTOP) || defined(STACK_DEBUG)
 #define backlight_on()
 #define backlight_off()