diff --git a/firmware/AtomBusMon.c b/firmware/AtomBusMon.c
index e442d9c..fc4651c 100644
--- a/firmware/AtomBusMon.c
+++ b/firmware/AtomBusMon.c
@@ -1591,7 +1591,7 @@ void initialize() {
   STATUS_DDR = MUXSEL_MASK;
   MUX_DDR = 0;
   CTRL_PORT = 0;
-  Serial_Init(57600);
+  Serial_Init(BAUD);
   version();
   // Update the hardware copy of the breakpoints
   uploadBreakpoints();
diff --git a/src/MC6809CpuMonALS.vhd b/src/MC6809CpuMonALS.vhd
index 7427de2..c8ad03b 100644
--- a/src/MC6809CpuMonALS.vhd
+++ b/src/MC6809CpuMonALS.vhd
@@ -99,7 +99,7 @@ begin
 
     wrapper : entity work.MC6809CpuMon
       generic map (
-          ClkMult           => 8,
+          ClkMult           => 12,
           ClkDiv            => 25,
           ClkPer            => 20.000,
           num_comparators   => num_comparators,
diff --git a/src/MOS6502CpuMonALS.vhd b/src/MOS6502CpuMonALS.vhd
index 68a6b7c..bba075b 100644
--- a/src/MOS6502CpuMonALS.vhd
+++ b/src/MOS6502CpuMonALS.vhd
@@ -116,7 +116,7 @@ begin
         generic map (
             UseT65Core        => UseT65Core,
             UseAlanDCore      => UseAlanDCore,
-            ClkMult           => 8,
+            ClkMult           => 12,
             ClkDiv            => 25,
             ClkPer            => 20.000,
             num_comparators   => num_comparators,
diff --git a/src/Z80CpuMonALS.vhd b/src/Z80CpuMonALS.vhd
index 862f764..8996238 100644
--- a/src/Z80CpuMonALS.vhd
+++ b/src/Z80CpuMonALS.vhd
@@ -127,7 +127,7 @@ begin
 
     wrapper : entity work.Z80CpuMon
         generic map (
-            ClkMult           => 8,
+            ClkMult           => 12,
             ClkDiv            => 25,
             ClkPer            => 20.000,
             num_comparators   => num_comparators,
diff --git a/target/common/Makefile.inc b/target/common/Makefile.inc
index f8a7cad..1e911f3 100644
--- a/target/common/Makefile.inc
+++ b/target/common/Makefile.inc
@@ -8,6 +8,10 @@ SHELL      := env PATH=$(PATH) /bin/bash
 # Frequency of the AVR CPU
 F_CPU       ?= 15855484
 
+# Default Baud Rate of serial interface
+# Note: F_CPU / 16 / BAUD need to be close to an integer
+BAUD        ?= 57600
+
 # Path of the back anotated block memory map file
 BMM_FILE    ?= memory_bd.bmm
 
@@ -18,7 +22,7 @@ OBJCOPY=avr-objcopy
 
 PROG = avr_progmem
 
-CFLAGS=$(CPU_CFLAGS) -DF_CPU=${F_CPU}UL -mmcu=$(MCU) -Wall -Os -mcall-prologues
+CFLAGS=$(CPU_CFLAGS) -DF_CPU=${F_CPU}UL -DBAUD=${BAUD} -mmcu=$(MCU) -Wall -Os -mcall-prologues
 
 OBJECTS=AtomBusMon.o status.o $(CPU_OBJECTS)
 
diff --git a/target/lx9_dave/ice6502/Makefile b/target/lx9_dave/ice6502/Makefile
index 1d8e276..f621795 100644
--- a/target/lx9_dave/ice6502/Makefile
+++ b/target/lx9_dave/ice6502/Makefile
@@ -11,7 +11,11 @@ PROJECT    = MOS6502CpuMonALS
 TARGET     = ice6502
 
 # Frequuency that the AVR runs at
-F_CPU      = 16000000
+F_CPU      = 24000000
+
+# Default Baud Rate of serial interface
+# Note: F_CPU / 16 / BAUD need to be close to an integer
+BAUD       = 115200
 
 # Common include files
 include $(COMMON)/Makefile_$(TARGET).inc
diff --git a/target/lx9_dave/ice65c02/Makefile b/target/lx9_dave/ice65c02/Makefile
index ae87d2f..1a695b9 100644
--- a/target/lx9_dave/ice65c02/Makefile
+++ b/target/lx9_dave/ice65c02/Makefile
@@ -11,7 +11,11 @@ PROJECT    = MOS6502CpuMonALS
 TARGET     = ice65c02
 
 # Frequuency that the AVR runs at
-F_CPU      = 16000000
+F_CPU      = 24000000
+
+# Default Baud Rate of serial interface
+# Note: F_CPU / 16 / BAUD need to be close to an integer
+BAUD       = 115200
 
 # Common include files
 include $(COMMON)/Makefile_$(TARGET).inc
diff --git a/target/lx9_dave/ice6809/Makefile b/target/lx9_dave/ice6809/Makefile
index 1e517bd..6eca805 100644
--- a/target/lx9_dave/ice6809/Makefile
+++ b/target/lx9_dave/ice6809/Makefile
@@ -11,7 +11,11 @@ PROJECT    = MC6809CpuMonALS
 TARGET     = ice6809
 
 # Frequuency that the AVR runs at
-F_CPU      = 16000000
+F_CPU      = 24000000
+
+# Default Baud Rate of serial interface
+# Note: F_CPU / 16 / BAUD need to be close to an integer
+BAUD       = 115200
 
 # Common include files
 include $(COMMON)/Makefile_$(TARGET).inc
diff --git a/target/lx9_dave/icez80/Makefile b/target/lx9_dave/icez80/Makefile
index 5492ac6..b1124b9 100644
--- a/target/lx9_dave/icez80/Makefile
+++ b/target/lx9_dave/icez80/Makefile
@@ -11,7 +11,11 @@ PROJECT    = Z80CpuMonALS
 TARGET     = icez80
 
 # Frequuency that the AVR runs at
-F_CPU      = 16000000
+F_CPU      = 24000000
+
+# Default Baud Rate of serial interface
+# Note: F_CPU / 16 / BAUD need to be close to an integer
+BAUD       = 115200
 
 # Common include files
 include $(COMMON)/Makefile_$(TARGET).inc