diff --git a/common/tranzputer.c b/common/tranzputer.c
index 1e24875..13aca96 100644
--- a/common/tranzputer.c
+++ b/common/tranzputer.c
@@ -1602,7 +1602,7 @@ uint32_t setZ80CPUFrequency(float frequency, uint8_t action)
     // Locals.
     //
     uint32_t actualFreq = 0;
-
+printf("Change freq:%d, %f\n", action, frequency);
     // Setup the alternative clock frequency on the CTL_CLK pin.
     //
     if(action < 3)
@@ -3455,6 +3455,8 @@ printf("CPUCONFIG=%02x\n", cpuConfig);
                         // Make sure the video mode in the FPGA is correct (defaults to MZ700).
                         writeZ80IO(IO_TZ_VMCTRL, VMMODE_MZ2000, TRANZPUTER);
                     }
+        printf("Changing freq to 20MHz\n");
+        setZ80CPUFrequency(20000000, 0);
                     break;
 
                 case HW_MZ80A:
diff --git a/libraries/lib/libimath2-k64f.a b/libraries/lib/libimath2-k64f.a
index 01ed16c..0458503 100644
Binary files a/libraries/lib/libimath2-k64f.a and b/libraries/lib/libimath2-k64f.a differ
diff --git a/libraries/lib/libimath2-zpu.a b/libraries/lib/libimath2-zpu.a
index efee363..f447498 100644
Binary files a/libraries/lib/libimath2-zpu.a and b/libraries/lib/libimath2-zpu.a differ
diff --git a/libraries/lib/libumansi-k64f.a b/libraries/lib/libumansi-k64f.a
index 78e0e15..cbb44ff 100644
Binary files a/libraries/lib/libumansi-k64f.a and b/libraries/lib/libumansi-k64f.a differ
diff --git a/libraries/lib/libumansi-zpu.a b/libraries/lib/libumansi-zpu.a
index e6f5c40..3c76125 100644
Binary files a/libraries/lib/libumansi-zpu.a and b/libraries/lib/libumansi-zpu.a differ
diff --git a/libraries/lib/libummath-k64f.a b/libraries/lib/libummath-k64f.a
index 771c2c2..8b6dca6 100644
Binary files a/libraries/lib/libummath-k64f.a and b/libraries/lib/libummath-k64f.a differ
diff --git a/libraries/lib/libummath-zpu.a b/libraries/lib/libummath-zpu.a
index e8a1a77..081d5ae 100644
Binary files a/libraries/lib/libummath-zpu.a and b/libraries/lib/libummath-zpu.a differ
diff --git a/libraries/lib/libummathf-k64f.a b/libraries/lib/libummathf-k64f.a
index d28e874..4f6e166 100644
Binary files a/libraries/lib/libummathf-k64f.a and b/libraries/lib/libummathf-k64f.a differ
diff --git a/libraries/lib/libummathf-zpu.a b/libraries/lib/libummathf-zpu.a
index 7c3b9c3..9a3fd9f 100644
Binary files a/libraries/lib/libummathf-zpu.a and b/libraries/lib/libummathf-zpu.a differ
diff --git a/libraries/lib/libummisc-k64f.a b/libraries/lib/libummisc-k64f.a
index c1242f3..c525fbb 100644
Binary files a/libraries/lib/libummisc-k64f.a and b/libraries/lib/libummisc-k64f.a differ
diff --git a/libraries/lib/libummisc-zpu.a b/libraries/lib/libummisc-zpu.a
index 111e770..5a4a9c5 100644
Binary files a/libraries/lib/libummisc-zpu.a and b/libraries/lib/libummisc-zpu.a differ
diff --git a/libraries/lib/libumstdio-k64f.a b/libraries/lib/libumstdio-k64f.a
index fc72d3f..2384bee 100644
Binary files a/libraries/lib/libumstdio-k64f.a and b/libraries/lib/libumstdio-k64f.a differ
diff --git a/libraries/lib/libumstdio-zpu.a b/libraries/lib/libumstdio-zpu.a
index dc4d732..6aca5dd 100644
Binary files a/libraries/lib/libumstdio-zpu.a and b/libraries/lib/libumstdio-zpu.a differ
diff --git a/startup/zputa_with_tiny_iocp_in_bram.ld b/startup/zputa_with_tiny_iocp_in_bram.ld
index 8e8e02e..5fc9f5f 100644
--- a/startup/zputa_with_tiny_iocp_in_bram.ld
+++ b/startup/zputa_with_tiny_iocp_in_bram.ld
@@ -35,96 +35,124 @@ MEMORY
 {
   BOOT (rx) : ORIGIN = 0x00001000,   LENGTH = 0x000200  /* Boot section which shouldnt exist in an app, so a link trap as warning */
   CODE (rx) : ORIGIN = 0x00001200,   LENGTH = 0x0000AE00   /* Up to the end of the RAM first less stack space */
+  HEAP (rx)  : ORIGIN = 0x0000AFF4, LENGTH = 0x4000  /* Allocated heap space for the OS. */
+  STACK (rx) : ORIGIN = 0x0000EFF8, LENGTH = 0x1000  /* Allocated stack space for the OS. */
 }
 
 /* Section Definitions */
 
 SECTIONS
 {
-  /* first section is .fixed_vectors which is used for startup code */
-  . = 0x00001000;
-  _ramstart = . ;
-  __boot_start__ = . ;
-  .fixed_vectors :
-  {
-	KEEP(*(.fixed_vectors)) /* Seed section - allows -gc-sections */
-  }>BOOT
-  __boot_end__ = . ;
+    /* first section is .fixed_vectors which is used for startup code */
+    . = 0x00001000;
+    _ramstart = . ;
+    __boot_start__ = . ;
+    .fixed_vectors :
+    {
+        KEEP(*(.fixed_vectors)) /* Seed section - allows -gc-sections */
+    }>BOOT
+    __boot_end__ = . ;
 
-  /* Remaining code sections */
-  . = ALIGN(4);
-  __text_start__ = . ;
-  .text :
-  {
-    *(.text)                   /* remaining code */
-    *(.text.*)                   /* remaining code */
-	. = ALIGN(4);
-	__ctors_start__ = . ;
-	KEEP(*(.ctors))
-	KEEP(*(.ctors.*))
-	__ctors_end__ = . ;
+    /* Remaining code sections */
     . = ALIGN(4);
-	__dtors_start__ = . ;
-	KEEP(*(.dtors))
-	KEEP(*(.dtors.*))
-	__dtors_end__ = . ;
-  } >CODE
-  __text_end__ = . ;
-
-  /* .rodata section which is used for read-only data (constants) */
-  . = ALIGN(4);
-  __rodata_start__ = . ;
-  .rodata :
-  {
-    *(.rodata)
-    *(.rodata.*)
-  } >CODE
-  . = ALIGN(4);
-  __rodata_end__ = . ;
-  _ramend = . ;
-
-  /* .data section which is used for initialized data. */
-  . = ALIGN(4);
-  _datastart = . ;
-  .data :
-  {
-    _data = . ;
-    __data_start__ = . ;
-    *(.data)
-    *(.data.*)
-    SORT(CONSTRUCTORS)
+    __text_start__ = . ;
+    .text :
+    {
+        *(.text)                     /* remaining code */
+        *(.text.*)                   /* remaining code */
+        . = ALIGN(4);
+        __ctors_start__ = . ;
+        KEEP(*(.ctors))
+        KEEP(*(.ctors.*))
+        __ctors_end__ = . ;
+        . = ALIGN(4);
+        __dtors_start__ = . ;
+        KEEP(*(.dtors))
+        KEEP(*(.dtors.*))
+        __dtors_end__ = . ;
+    } >CODE
+    __text_end__ = . ;
+  
+    /* .rodata section which is used for read-only data (constants) */
     . = ALIGN(4);
-    __data_end__ = . ;
-  } >CODE
+    __rodata_start__ = . ;
+    .rodata :
+    {
+        *(.rodata)
+        *(.rodata.*)
+    } >CODE
+    . = ALIGN(4);
+    __rodata_end__ = . ;
+    _ramend = . ;
+  
+    /* .data section which is used for initialized data. */
+    . = ALIGN(4);
+    _datastart = . ;
+    .data :
+    {
+        _data = . ;
+        __data_start__ = . ;
+        *(.data)
+        *(.data.*)
+        SORT(CONSTRUCTORS)
+        . = ALIGN(4);
+        __data_end__ = . ;
+    } >CODE
+  
+    /* .bss section which is used for uninitialized data */
+    . = ALIGN(4);
+    .bss :
+    {
+        __bss_start = . ;
+        __bss_start__ = . ;
+        *(.bss)
+        *(.bss.*)
+        *(COMMON)
+        __bss_end__ = . ;
+        _end = . ;
+    } >CODE
+    _dataend = . ;
 
-  /* .bss section which is used for uninitialized data */
-  . = ALIGN(4);
-  .bss :
-  {
-    __bss_start = . ;
-    __bss_start__ = . ;
-    *(.bss)
-    *(.bss.*)
-    *(COMMON)
-	__bss_end__ = . ;
-	_end = . ;
-  } >CODE
-  _dataend = . ;
+    /* Variable expanded by build.sh */
+    .heap 0x0000AFF4:
+    {
+        /* . = 0x0000AFF4; */
+        . = ALIGN(4);
+        __heap_section_start__ = .;
+        __HeapBase = .;
+        PROVIDE(end = .);
+        . += 0x4000;
+        __end__ = .;
+        __HeapLimit = .;
+        __heap_section_end__ = .;
+    } > HEAP
+    
+    /* Variable expanded by build.sh */
+    .stack 0x0000EFF8 :
+    {
+        /* . = 0x0000EFF8; */
+        . = ALIGN(4);
+        __stack_section_start__ = .;
+        . += 0x1000;
+        __stack_section_end__ = .;
+    } > STACK    
+  
+    /*
+    __HeapBase = 0x0000AFF4;
+    __HeapLimit = 0x0000EFF4;
+    */
+  
+    /* Top of stack pointer, used for sbrk validation. */  
+    _stack = 0x0000FFF8;
 
-  __HeapBase = .;
-  __HeapLimit = 0x0000DFF8 - 0x400;
-
-  /* Top of stack pointer, used for sbrk validation. */  
-  _stack = 0x0000DFF8;
-
-	/* Debug information */
-  .debug_loc 0 : { *(.debug_loc) }
-  .debug_abbrev 0 : { *(.debug_abbrev) }
-  .debug_str 0 : { *(.debug_str) }
-  .debug_info 0 : { *(.debug_info) }
-  .debug_line 0 : { *(.debug_line) }
-  .debug_frame 0 : { *(.debug_frame) }
-  .debug_pubnames 0 : { *(.debug_pubnames) }
-  .debug_aranges 0 : { *(.debug_aranges) }
-  .comment : { *(.comment) }
+      /* Debug information */
+    .debug_loc 0 : { *(.debug_loc) }
+    .debug_abbrev 0 : { *(.debug_abbrev) }
+    .debug_str 0 : { *(.debug_str) }
+    .debug_info 0 : { *(.debug_info) }
+    .debug_line 0 : { *(.debug_line) }
+    .debug_frame 0 : { *(.debug_frame) }
+    .debug_pubnames 0 : { *(.debug_pubnames) }
+    .debug_aranges 0 : { *(.debug_aranges) }
+    .comment : { *(.comment) }
 }