diff --git a/CHANGELOG.md b/CHANGELOG.md
index ad3ac43..08b78f4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,13 +5,23 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
 
+## [0.5.4] - 2023-09-04
+- merge #39 add **read64(), write64()**  (kudos to pvogt09)
+- merge #40 add **MB85RC64V** info (kudos to pvogt09)
+- rewrite **getManufacturerID, getProductID, getSize()**
+  to handle non existent metadata (See #38)
+- update keywords.txt
+- update unit test
+- improved readability parameter names
+- update readme.md
+
+
 ## [0.5.3] - 2023-04-28
 - major redo FRAM9 and FRAM11, see #35
 - update FRAM32 to match FRAM
 - update readme.md.
 - minor edits
 
-
 ## [0.5.2] - 2023-04-22
 - add **FRAM_ML** class - see FRAM_MULTILANGUAGE.md
 - add examples.
diff --git a/FRAM.cpp b/FRAM.cpp
index 1d102fb..9a15555 100644
--- a/FRAM.cpp
+++ b/FRAM.cpp
@@ -1,7 +1,7 @@
 //
 //    FILE: FRAM.cpp
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.5.3
+// VERSION: 0.5.4
 //    DATE: 2018-01-24
 // PURPOSE: Arduino library for I2C FRAM
 //     URL: https://github.com/RobTillaart/FRAM_I2C
@@ -89,130 +89,130 @@ bool FRAM::isConnected()
 }
 
 
-void FRAM::write8(uint16_t memaddr, uint8_t value)
+void FRAM::write8(uint16_t memAddr, uint8_t value)
 {
   uint8_t val = value;
-  _writeBlock(memaddr, (uint8_t *)&val, sizeof(uint8_t));
+  _writeBlock(memAddr, (uint8_t *)&val, sizeof(uint8_t));
 }
 
 
-void FRAM::write16(uint16_t memaddr, uint16_t value)
+void FRAM::write16(uint16_t memAddr, uint16_t value)
 {
   uint16_t val = value;
-  _writeBlock(memaddr, (uint8_t *)&val, sizeof(uint16_t));
+  _writeBlock(memAddr, (uint8_t *)&val, sizeof(uint16_t));
 }
 
 
-void FRAM::write32(uint16_t memaddr, uint32_t value)
+void FRAM::write32(uint16_t memAddr, uint32_t value)
 {
   uint32_t val = value;
-  _writeBlock(memaddr, (uint8_t *)&val, sizeof(uint32_t));
+  _writeBlock(memAddr, (uint8_t *)&val, sizeof(uint32_t));
 }
 
 
-void FRAM::write64(uint16_t memaddr, uint64_t value)
+void FRAM::write64(uint16_t memAddr, uint64_t value)
 {
   uint64_t val = value;
-  _writeBlock(memaddr, (uint8_t *)&val, sizeof(uint64_t));
+  _writeBlock(memAddr, (uint8_t *)&val, sizeof(uint64_t));
 }
 
 
-void FRAM::writeFloat(uint16_t memaddr, float value)
+void FRAM::writeFloat(uint16_t memAddr, float value)
 {
   float val = value;
-  _writeBlock(memaddr, (uint8_t *)&val, sizeof(float));
+  _writeBlock(memAddr, (uint8_t *)&val, sizeof(float));
 }
 
 
-void FRAM::writeDouble(uint16_t memaddr, double value)
+void FRAM::writeDouble(uint16_t memAddr, double value)
 {
   double val = value;
-  _writeBlock(memaddr, (uint8_t *)&val, sizeof(double));
+  _writeBlock(memAddr, (uint8_t *)&val, sizeof(double));
 }
 
 
-void FRAM::write(uint16_t memaddr, uint8_t * obj, uint16_t size)
+void FRAM::write(uint16_t memAddr, uint8_t * obj, uint16_t size)
 {
   const int blocksize = 24;
   uint8_t * p = obj;
   while (size >= blocksize)
   {
-    _writeBlock(memaddr, p, blocksize);
-    memaddr += blocksize;
+    _writeBlock(memAddr, p, blocksize);
+    memAddr += blocksize;
     p += blocksize;
     size -= blocksize;
   }
   //  remaining
   if (size > 0)
   {
-    _writeBlock(memaddr, p, size);
+    _writeBlock(memAddr, p, size);
   }
 }
 
 
-uint8_t FRAM::read8(uint16_t memaddr)
+uint8_t FRAM::read8(uint16_t memAddr)
 {
   uint8_t val;
-  _readBlock(memaddr, (uint8_t *)&val, sizeof(uint8_t));
+  _readBlock(memAddr, (uint8_t *)&val, sizeof(uint8_t));
   return val;
 }
 
 
-uint16_t FRAM::read16(uint16_t memaddr)
+uint16_t FRAM::read16(uint16_t memAddr)
 {
   uint16_t val;
-  _readBlock(memaddr, (uint8_t *)&val, sizeof(uint16_t));
+  _readBlock(memAddr, (uint8_t *)&val, sizeof(uint16_t));
   return val;
 }
 
 
-uint32_t FRAM::read32(uint16_t memaddr)
+uint32_t FRAM::read32(uint16_t memAddr)
 {
   uint32_t val;
-  _readBlock(memaddr, (uint8_t *)&val, sizeof(uint32_t));
+  _readBlock(memAddr, (uint8_t *)&val, sizeof(uint32_t));
   return val;
 }
 
 
-uint64_t FRAM::read64(uint16_t memaddr)
+uint64_t FRAM::read64(uint16_t memAddr)
 {
   uint64_t val;
-  _readBlock(memaddr, (uint8_t *)&val, sizeof(uint64_t));
+  _readBlock(memAddr, (uint8_t *)&val, sizeof(uint64_t));
   return val;
 }
 
 
-float FRAM::readFloat(uint16_t memaddr)
+float FRAM::readFloat(uint16_t memAddr)
 {
   float val;
-  _readBlock(memaddr, (uint8_t *)&val, sizeof(float));
+  _readBlock(memAddr, (uint8_t *)&val, sizeof(float));
   return val;
 }
 
 
-double FRAM::readDouble(uint16_t memaddr)
+double FRAM::readDouble(uint16_t memAddr)
 {
   double val;
-  _readBlock(memaddr, (uint8_t *)&val, sizeof(double));
+  _readBlock(memAddr, (uint8_t *)&val, sizeof(double));
   return val;
 }
 
 
-void FRAM::read(uint16_t memaddr, uint8_t * obj, uint16_t size)
+void FRAM::read(uint16_t memAddr, uint8_t * obj, uint16_t size)
 {
   const uint8_t blocksize = 24;
   uint8_t * p = obj;
   while (size >= blocksize)
   {
-    _readBlock(memaddr, p, blocksize);
-    memaddr += blocksize;
+    _readBlock(memAddr, p, blocksize);
+    memAddr += blocksize;
     p += blocksize;
     size -= blocksize;
   }
   // remainder
   if (size > 0)
   {
-    _readBlock(memaddr, p, size);
+    _readBlock(memAddr, p, size);
   }
 }
 
@@ -220,15 +220,15 @@ void FRAM::read(uint16_t memaddr, uint8_t * obj, uint16_t size)
 ////////////////////////////////////////////////////////////////////////
 
 
-int32_t FRAM::readUntil(uint16_t memaddr, char * buf, uint16_t buflen, char separator)
+int32_t FRAM::readUntil(uint16_t memAddr, char * buffer, uint16_t bufferLength, char separator)
 {
   //  read and fill the buffer at once.
-  read(memaddr, (uint8_t *)buf, buflen);
-  for (uint16_t length = 0; length < buflen; length++)
+  read(memAddr, (uint8_t *)buffer, bufferLength);
+  for (uint16_t length = 0; length < bufferLength; length++)
   {
-    if (buf[length] == separator)
+    if (buffer[length] == separator)
     {
-      buf[length] = 0;    //  replace separator => \0 EndChar
+      buffer[length] = 0;    //  replace separator => \0 EndChar
       return length;
     }
   }
@@ -237,15 +237,15 @@ int32_t FRAM::readUntil(uint16_t memaddr, char * buf, uint16_t buflen, char sepa
 }
 
 
-int32_t FRAM::readLine(uint16_t memaddr, char * buf, uint16_t buflen)
+int32_t FRAM::readLine(uint16_t memAddr, char * buffer, uint16_t bufferLength)
 {
   //  read and fill the buffer at once.
-  read(memaddr, (uint8_t *)buf, buflen);
-  for (uint16_t length = 0; length < buflen-1; length++)
+  read(memAddr, (uint8_t *)buffer, bufferLength);
+  for (uint16_t length = 0; length < bufferLength-1; length++)
   {
-    if (buf[length] == '\n')
+    if (buffer[length] == '\n')
     {
-      buf[length + 1] = 0;    //  add \0 EndChar after '\n'
+      buffer[length + 1] = 0;    //  add \0 EndChar after '\n'
       return length + 1;
     }
   }
@@ -274,22 +274,32 @@ bool FRAM::getWriteProtect()
 
 uint16_t FRAM::getManufacturerID()
 {
-  return _getMetaData(0);
+  uint32_t value = _getMetaData();
+  return (value >> 12) & 0x0FFF;
 }
 
 
 uint16_t FRAM::getProductID()
 {
-  return _getMetaData(1);
+  uint32_t value = _getMetaData();
+  return value & 0x0FFF;
 }
 
 
-// NOTE: returns the size in kiloBYTE
+//  DENSITY
+//           Fujitsu data sheet
+//  3 =>     MB85RC64 = 64 Kbit.
+//  5 =>     MB85RC256
+//  6 =>     MB85RC512
+//  7 =>     MB85RC1M
+//  NOTE: returns the size in kiloBYTE (0 is read error)
 uint16_t FRAM::getSize()
 {
-  uint16_t density = _getMetaData(2);
-  uint16_t size = 0;
-  if (density > 0) size = (1UL << density);
+  uint32_t value = _getMetaData();
+  if (value == 0xFFFFFFFF) return 0;
+
+  uint16_t density = (value >> 8) & 0x0F;
+  uint16_t size = (1UL << density);
   _sizeBytes = size * 1024UL;
   return size;
 }
@@ -351,20 +361,18 @@ bool FRAM::wakeup(uint32_t trec)
 // FRAM PROTECTED
 //
 
-//  metadata is packed as  [....MMMM][MMMMDDDD][PPPPPPPP]
+//  metadata is packed as  [MMMMMMMM][MMMMDDDD][PPPPPPPP]
 //  M = manufacturerID
 //  D = density => memory size = 2^D KB
 //  P = product ID (together with D)
 //  P part might be proprietary
-uint16_t FRAM::_getMetaData(uint8_t field)
+uint32_t FRAM::_getMetaData()
 {
-  if (field > 2) return 0;
-
   _wire->beginTransmission(FRAM_SLAVE_ID_);
   _wire->write(_address << 1);
   _wire->endTransmission(false);
   int x = _wire->requestFrom(FRAM_SLAVE_ID_, (uint8_t)3);
-  if (x != 3) return -1;
+  if (x != 3) return 0xFFFFFFFF;
 
   uint32_t value = 0;
   value = _wire->read();
@@ -373,26 +381,15 @@ uint16_t FRAM::_getMetaData(uint8_t field)
   value = value << 8;
   value |= _wire->read();
 
-  //  MANUFACTURER
-  if (field == 0) return (value >> 12) & 0xFF;
-  //  PRODUCT ID
-  if (field == 1) return value & 0x0FFF;
-  //  DENSITY
-  //           Fujitsu data sheet
-  //  3 =>     MB85RC64 = 64 Kbit.
-  //  5 =>     MB85RC256
-  //  6 =>     MB85RC512
-  //  7 =>     MB85RC1M
-  if (field == 2) return (value >> 8) & 0x0F;
-  return 0;
+  return value;
 }
 
 
-void FRAM::_writeBlock(uint16_t memaddr, uint8_t * obj, uint8_t size)
+void FRAM::_writeBlock(uint16_t memAddr, uint8_t * obj, uint8_t size)
 {
   _wire->beginTransmission(_address);
-  _wire->write((uint8_t) (memaddr >> 8));
-  _wire->write((uint8_t) (memaddr & 0xFF));
+  _wire->write((uint8_t) (memAddr >> 8));
+  _wire->write((uint8_t) (memAddr & 0xFF));
   uint8_t * p = obj;
   for (uint8_t i = size; i > 0; i--)
   {
@@ -402,11 +399,11 @@ void FRAM::_writeBlock(uint16_t memaddr, uint8_t * obj, uint8_t size)
 }
 
 
-void FRAM::_readBlock(uint16_t memaddr, uint8_t * obj, uint8_t size)
+void FRAM::_readBlock(uint16_t memAddr, uint8_t * obj, uint8_t size)
 {
   _wire->beginTransmission(_address);
-  _wire->write((uint8_t) (memaddr >> 8));
-  _wire->write((uint8_t) (memaddr & 0xFF));
+  _wire->write((uint8_t) (memAddr >> 8));
+  _wire->write((uint8_t) (memAddr & 0xFF));
   _wire->endTransmission();
   _wire->requestFrom(_address, size);
   uint8_t * p = obj;
@@ -427,143 +424,143 @@ FRAM32::FRAM32(TwoWire *wire) : FRAM(wire)
 }
 
 
-void FRAM32::write8(uint32_t memaddr, uint8_t value)
+void FRAM32::write8(uint32_t memAddr, uint8_t value)
 {
   uint8_t val = value;
-  _writeBlock(memaddr, (uint8_t *)&val, sizeof(uint8_t));
+  _writeBlock(memAddr, (uint8_t *)&val, sizeof(uint8_t));
 }
 
 
-void FRAM32::write16(uint32_t memaddr, uint16_t value)
+void FRAM32::write16(uint32_t memAddr, uint16_t value)
 {
   uint16_t val = value;
-  _writeBlock(memaddr, (uint8_t *)&val, sizeof(uint16_t));
+  _writeBlock(memAddr, (uint8_t *)&val, sizeof(uint16_t));
 }
 
 
-void FRAM32::write32(uint32_t memaddr, uint32_t value)
+void FRAM32::write32(uint32_t memAddr, uint32_t value)
 {
   uint32_t val = value;
-  _writeBlock(memaddr, (uint8_t *)&val, sizeof(uint32_t));
+  _writeBlock(memAddr, (uint8_t *)&val, sizeof(uint32_t));
 }
 
 
-void FRAM32::write64(uint32_t memaddr, uint64_t value)
+void FRAM32::write64(uint32_t memAddr, uint64_t value)
 {
   uint64_t val = value;
-  _writeBlock(memaddr, (uint8_t *)&val, sizeof(uint64_t));
+  _writeBlock(memAddr, (uint8_t *)&val, sizeof(uint64_t));
 }
 
 
-void FRAM32::writeFloat(uint32_t memaddr, float value)
+void FRAM32::writeFloat(uint32_t memAddr, float value)
 {
   float val = value;
-  _writeBlock(memaddr, (uint8_t *)&val, sizeof(float));
+  _writeBlock(memAddr, (uint8_t *)&val, sizeof(float));
 }
 
 
-void FRAM32::writeDouble(uint32_t memaddr, double value)
+void FRAM32::writeDouble(uint32_t memAddr, double value)
 {
   double val = value;
-  _writeBlock(memaddr, (uint8_t *)&val, sizeof(double));
+  _writeBlock(memAddr, (uint8_t *)&val, sizeof(double));
 }
 
 
-void FRAM32::write(uint32_t memaddr, uint8_t * obj, uint16_t size)
+void FRAM32::write(uint32_t memAddr, uint8_t * obj, uint16_t size)
 {
   const int blocksize = 24;
   uint8_t * p = obj;
   while (size >= blocksize)
   {
-    _writeBlock(memaddr, p, blocksize);
-    memaddr += blocksize;
+    _writeBlock(memAddr, p, blocksize);
+    memAddr += blocksize;
     p += blocksize;
     size -= blocksize;
   }
   // remaining
   if (size > 0)
   {
-    _writeBlock(memaddr, p, size);
+    _writeBlock(memAddr, p, size);
   }
 }
 
 
-uint8_t FRAM32::read8(uint32_t memaddr)
+uint8_t FRAM32::read8(uint32_t memAddr)
 {
   uint8_t val;
-  _readBlock(memaddr, (uint8_t *)&val, sizeof(uint8_t));
+  _readBlock(memAddr, (uint8_t *)&val, sizeof(uint8_t));
   return val;
 }
 
 
-uint16_t FRAM32::read16(uint32_t memaddr)
+uint16_t FRAM32::read16(uint32_t memAddr)
 {
   uint16_t val;
-  _readBlock(memaddr, (uint8_t *)&val, sizeof(uint16_t));
+  _readBlock(memAddr, (uint8_t *)&val, sizeof(uint16_t));
   return val;
 }
 
 
-uint32_t FRAM32::read32(uint32_t memaddr)
+uint32_t FRAM32::read32(uint32_t memAddr)
 {
   uint32_t val;
-  _readBlock(memaddr, (uint8_t *)&val, sizeof(uint32_t));
+  _readBlock(memAddr, (uint8_t *)&val, sizeof(uint32_t));
   return val;
 }
 
 
-uint64_t FRAM32::read64(uint32_t memaddr)
+uint64_t FRAM32::read64(uint32_t memAddr)
 {
   uint64_t val;
-  _readBlock(memaddr, (uint8_t *)&val, sizeof(uint64_t));
+  _readBlock(memAddr, (uint8_t *)&val, sizeof(uint64_t));
   return val;
 }
 
 
-float FRAM32::readFloat(uint32_t memaddr)
+float FRAM32::readFloat(uint32_t memAddr)
 {
   float val;
-  _readBlock(memaddr, (uint8_t *)&val, sizeof(float));
+  _readBlock(memAddr, (uint8_t *)&val, sizeof(float));
   return val;
 }
 
 
-double FRAM32::readDouble(uint32_t memaddr)
+double FRAM32::readDouble(uint32_t memAddr)
 {
   double val;
-  _readBlock(memaddr, (uint8_t *)&val, sizeof(double));
+  _readBlock(memAddr, (uint8_t *)&val, sizeof(double));
   return val;
 }
 
 
-void FRAM32::read(uint32_t memaddr, uint8_t * obj, uint16_t size)
+void FRAM32::read(uint32_t memAddr, uint8_t * obj, uint16_t size)
 {
   const uint8_t blocksize = 24;
   uint8_t * p = obj;
   while (size >= blocksize)
   {
-    _readBlock(memaddr, p, blocksize);
-    memaddr += blocksize;
+    _readBlock(memAddr, p, blocksize);
+    memAddr += blocksize;
     p += blocksize;
     size -= blocksize;
   }
   // remainder
   if (size > 0)
   {
-    _readBlock(memaddr, p, size);
+    _readBlock(memAddr, p, size);
   }
 }
 
 
-int32_t FRAM32::readUntil(uint32_t memaddr, char * buf, uint16_t buflen, char separator)
+int32_t FRAM32::readUntil(uint32_t memAddr, char * buffer, uint16_t bufferLength, char separator)
 {
   //  read and fill the buffer at once.
-  read(memaddr, (uint8_t *)buf, buflen);
-  for (uint16_t length = 0; length < buflen; length++)
+  read(memAddr, (uint8_t *)buffer, bufferLength);
+  for (uint16_t length = 0; length < bufferLength; length++)
   {
-    if (buf[length] == separator)
+    if (buffer[length] == separator)
     {
-      buf[length] = 0;    //  replace separator => \0 EndChar
+      buffer[length] = 0;    //  replace separator => \0 EndChar
       return length;
     }
   }
@@ -572,15 +569,15 @@ int32_t FRAM32::readUntil(uint32_t memaddr, char * buf, uint16_t buflen, char se
 }
 
 
-int32_t FRAM32::readLine(uint32_t memaddr, char * buf, uint16_t buflen)
+int32_t FRAM32::readLine(uint32_t memAddr, char * buffer, uint16_t bufferLength)
 {
   //  read and fill the buffer at once.
-  read(memaddr, (uint8_t *)buf, buflen);
-  for (uint16_t length = 0; length < buflen-1; length++)
+  read(memAddr, (uint8_t *)buffer, bufferLength);
+  for (uint16_t length = 0; length < bufferLength-1; length++)
   {
-    if (buf[length] == '\n')
+    if (buffer[length] == '\n')
     {
-      buf[length + 1] = 0;    //  add \0 EndChar after '\n'
+      buffer[length + 1] = 0;    //  add \0 EndChar after '\n'
       return length + 1;
     }
   }
@@ -589,29 +586,29 @@ int32_t FRAM32::readLine(uint32_t memaddr, char * buf, uint16_t buflen)
 }
 
 
-template <class T> uint32_t FRAM32::writeObject(uint32_t memaddr, T &obj)
+template <class T> uint32_t FRAM32::writeObject(uint32_t memAddr, T &obj)
 {
-  write(memaddr, (uint8_t *) &obj, sizeof(obj));
-  return memaddr + sizeof(obj);
+  write(memAddr, (uint8_t *) &obj, sizeof(obj));
+  return memAddr + sizeof(obj);
 };
 
 
-template <class T> uint32_t FRAM32::readObject(uint32_t memaddr, T &obj)
+template <class T> uint32_t FRAM32::readObject(uint32_t memAddr, T &obj)
 {
-  read(memaddr, (uint8_t *) &obj, sizeof(obj));
-  return memaddr + sizeof(obj);
+  read(memAddr, (uint8_t *) &obj, sizeof(obj));
+  return memAddr + sizeof(obj);
 }
 
 
 uint32_t FRAM32::clear(uint8_t value)
 {
-  uint8_t buf[16];
-  for (uint8_t i = 0; i < 16; i++) buf[i] = value;
+  uint8_t buffer[16];
+  for (uint8_t i = 0; i < 16; i++) buffer[i] = value;
   uint32_t start = 0;
   uint32_t end = _sizeBytes;
   for (uint32_t addr = start; addr < end; addr += 16)
   {
-    _writeBlock(addr, buf, 16);
+    _writeBlock(addr, buffer, 16);
   }
   return end - start;
 }
@@ -623,14 +620,14 @@ uint32_t FRAM32::clear(uint8_t value)
 //
 //  FRAM32  PROTECTED
 //
-void FRAM32::_writeBlock(uint32_t memaddr, uint8_t * obj, uint8_t size)
+void FRAM32::_writeBlock(uint32_t memAddr, uint8_t * obj, uint8_t size)
 {
   uint8_t _addr = _address;
-  if (memaddr & 0x00010000) _addr += 0x01;
+  if (memAddr & 0x00010000) _addr += 0x01;
 
   _wire->beginTransmission(_addr);
-  _wire->write((uint8_t) (memaddr >> 8));
-  _wire->write((uint8_t) (memaddr & 0xFF));
+  _wire->write((uint8_t) (memAddr >> 8));
+  _wire->write((uint8_t) (memAddr & 0xFF));
   uint8_t * p = obj;
   for (uint8_t i = size; i > 0; i--)
   {
@@ -640,14 +637,14 @@ void FRAM32::_writeBlock(uint32_t memaddr, uint8_t * obj, uint8_t size)
 }
 
 
-void FRAM32::_readBlock(uint32_t memaddr, uint8_t * obj, uint8_t size)
+void FRAM32::_readBlock(uint32_t memAddr, uint8_t * obj, uint8_t size)
 {
   uint8_t _addr = _address;
-  if (memaddr & 0x00010000) _addr += 0x01;
+  if (memAddr & 0x00010000) _addr += 0x01;
 
   _wire->beginTransmission(_address);
-  _wire->write((uint8_t) (memaddr >> 8));
-  _wire->write((uint8_t) (memaddr & 0xFF));
+  _wire->write((uint8_t) (memAddr >> 8));
+  _wire->write((uint8_t) (memAddr & 0xFF));
   _wire->endTransmission();
   _wire->requestFrom(_addr, size);
   uint8_t * p = obj;
@@ -699,12 +696,12 @@ uint16_t FRAM11::getSize()
 //
 //  FRAM11  PROTECTED
 //
-void FRAM11::_writeBlock(uint16_t memaddr, uint8_t * obj, uint8_t size)
+void FRAM11::_writeBlock(uint16_t memAddr, uint8_t * obj, uint8_t size)
 {
   // Device uses Address Pages
-  uint8_t  DeviceAddrWithPageBits = _address | ((memaddr & 0x0700) >> 8);
+  uint8_t  DeviceAddrWithPageBits = _address | ((memAddr & 0x0700) >> 8);
   _wire->beginTransmission(DeviceAddrWithPageBits);
-  _wire->write((uint8_t) (memaddr & 0xFF));
+  _wire->write((uint8_t) (memAddr & 0xFF));
 
   uint8_t * p = obj;
   for (uint8_t i = size; i > 0; i--)
@@ -715,12 +712,12 @@ void FRAM11::_writeBlock(uint16_t memaddr, uint8_t * obj, uint8_t size)
 }
 
 
-void FRAM11::_readBlock(uint16_t memaddr, uint8_t * obj, uint8_t size)
+void FRAM11::_readBlock(uint16_t memAddr, uint8_t * obj, uint8_t size)
 {
   // Device uses Address Pages
-  uint8_t DeviceAddrWithPageBits = _address | ((memaddr & 0x0700) >> 8);
+  uint8_t DeviceAddrWithPageBits = _address | ((memAddr & 0x0700) >> 8);
   _wire->beginTransmission(DeviceAddrWithPageBits);
-  _wire->write((uint8_t) (memaddr & 0xFF));
+  _wire->write((uint8_t) (memAddr & 0xFF));
   _wire->endTransmission();
   _wire->requestFrom(DeviceAddrWithPageBits, size);
 
@@ -774,12 +771,12 @@ uint16_t FRAM9::getSize()
 //
 //  FRAM9  PROTECTED
 //
-void FRAM9::_writeBlock(uint16_t memaddr, uint8_t * obj, uint8_t size)
+void FRAM9::_writeBlock(uint16_t memAddr, uint8_t * obj, uint8_t size)
 {
   // Device uses Address Pages
-  uint8_t DeviceAddrWithPageBits = _address | ((memaddr & 0x0100) >> 8);
+  uint8_t DeviceAddrWithPageBits = _address | ((memAddr & 0x0100) >> 8);
   _wire->beginTransmission(DeviceAddrWithPageBits);
-  _wire->write((uint8_t) (memaddr & 0xFF));
+  _wire->write((uint8_t) (memAddr & 0xFF));
 
   uint8_t * p = obj;
   for (uint8_t i = size; i > 0; i--)
@@ -790,12 +787,12 @@ void FRAM9::_writeBlock(uint16_t memaddr, uint8_t * obj, uint8_t size)
 }
 
 
-void FRAM9::_readBlock(uint16_t memaddr, uint8_t * obj, uint8_t size)
+void FRAM9::_readBlock(uint16_t memAddr, uint8_t * obj, uint8_t size)
 {
   // Device uses Address Pages
-  uint8_t DeviceAddrWithPageBits = _address | ((memaddr & 0x0100) >> 8);
+  uint8_t DeviceAddrWithPageBits = _address | ((memAddr & 0x0100) >> 8);
   _wire->beginTransmission(DeviceAddrWithPageBits);
-  _wire->write((uint8_t) (memaddr & 0xFF));
+  _wire->write((uint8_t) (memAddr & 0xFF));
   _wire->endTransmission();
   _wire->requestFrom(DeviceAddrWithPageBits, size);
 
diff --git a/FRAM.h b/FRAM.h
index 141d909..9612e8f 100644
--- a/FRAM.h
+++ b/FRAM.h
@@ -2,7 +2,7 @@
 //
 //    FILE: FRAM.h
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.5.3
+// VERSION: 0.5.4
 //    DATE: 2018-01-24
 // PURPOSE: Arduino library for I2C FRAM
 //     URL: https://github.com/RobTillaart/FRAM_I2C
@@ -12,7 +12,7 @@
 #include "Wire.h"
 
 
-#define FRAM_LIB_VERSION              (F("0.5.3"))
+#define FRAM_LIB_VERSION              (F("0.5.4"))
 
 
 #define FRAM_OK                         0
@@ -46,56 +46,67 @@ class FRAM
                  const int8_t writeProtectPin = -1);
   bool     isConnected();
 
-  void     write8(uint16_t memaddr, uint8_t value);
-  void     write16(uint16_t memaddr, uint16_t value);
-  void     write32(uint16_t memaddr, uint32_t value);
-  void     write64(uint16_t memaddr, uint64_t value);
-  void     writeFloat(uint16_t memaddr, float value);
-  void     writeDouble(uint16_t memaddr, double value);
-  void     write(uint16_t memaddr, uint8_t * obj, uint16_t size);
-
-  uint8_t  read8(uint16_t memaddr);
-  uint16_t read16(uint16_t memaddr);
-  uint32_t read32(uint16_t memaddr);
-  uint64_t read64(uint16_t memaddr);
-  float    readFloat(uint16_t memaddr);
-  double   readDouble(uint16_t memaddr);
-  void     read(uint16_t memaddr, uint8_t * obj, uint16_t size);
+
+  //  WRITE DATA TYPES
+  void     write8(uint16_t memAddr, uint8_t value);
+  void     write16(uint16_t memAddr, uint16_t value);
+  void     write32(uint16_t memAddr, uint32_t value);
+  void     write64(uint16_t memAddr, uint64_t value);
+  void     writeFloat(uint16_t memAddr, float value);
+  void     writeDouble(uint16_t memAddr, double value);
+  void     write(uint16_t memAddr, uint8_t * obj, uint16_t size);
+
+  //  fills FRAM with value, default 0.
+  uint32_t clear(uint8_t value = 0);
+
+
+  //  READ DATA TYPES
+  uint8_t  read8(uint16_t memAddr);
+  uint16_t read16(uint16_t memAddr);
+  uint32_t read32(uint16_t memAddr);
+  uint64_t read64(uint16_t memAddr);
+  float    readFloat(uint16_t memAddr);
+  double   readDouble(uint16_t memAddr);
+  void     read(uint16_t memAddr, uint8_t * obj, uint16_t size);
+
 
   //  Experimental 0.5.1
   //  readUntil returns length 0.. n of the buffer.
   //  readUntil does NOT include the separator character.
   //  readUntil returns -1 if data does not fit into buffer,
   //  =>  separator not encountered.
-  int32_t readUntil(uint16_t memaddr, char * buf, uint16_t buflen, char separator);
+  int32_t readUntil(uint16_t memAddr, char * buffer, uint16_t bufferLength, char separator);
   //  readLine returns length 0.. n of the buffer.
   //  readLine does include '\n' as end character.
   //  readLine returns -1 if data does not fit into buffer.
   //  buffer needs one place for end char '\0'.
-  int32_t readLine(uint16_t memaddr, char * buf, uint16_t buflen);
+  int32_t readLine(uint16_t memAddr, char * buffer, uint16_t bufferLength);
 
 
-  template <class T> uint16_t writeObject(uint16_t memaddr, T &obj)
+  template <class T> uint16_t writeObject(uint16_t memAddr, T &obj)
   {
-    write(memaddr, (uint8_t *) &obj, sizeof(obj));
-    return memaddr + sizeof(obj);
+    write(memAddr, (uint8_t *) &obj, sizeof(obj));
+    return memAddr + sizeof(obj);
   };
-  template <class T> uint16_t readObject(uint16_t memaddr, T &obj)
+  template <class T> uint16_t readObject(uint16_t memAddr, T &obj)
   {
-    read(memaddr, (uint8_t *) &obj, sizeof(obj));
-    return memaddr + sizeof(obj);
+    read(memAddr, (uint8_t *) &obj, sizeof(obj));
+    return memAddr + sizeof(obj);
   }
 
+
+  //  WRITEPROTECT
   //  works only if pin is defined in begin().
   bool     setWriteProtect(bool b);
   bool     getWriteProtect();
 
-  //  meta info
+
+  //  MEAT INFO
+  //  may not work for devices with no deviceID register.
   //  Fujitsu = 0x000A, Ramtron = 0x004
   uint16_t getManufacturerID();
-  //  Proprietary
+  //  Proprietary product ID
   uint16_t getProductID();
-
   //  virtual so derived classes FRAM9/11 use their implementation.
   //  Returns size in KILO-BYTE (or 0)
   //  Verify for all manufacturers.
@@ -105,10 +116,9 @@ class FRAM
   //  override when getSize() fails == 0 (see readme.md)
   void     setSizeBytes(uint32_t value);
 
-  //  fills FRAM with value, default 0.
-  uint32_t clear(uint8_t value = 0);
 
-  //  0.3.6
+
+  //  SLEEP - 0.3.6
   void sleep();
   //  trec <= 400us  P12
   bool wakeup(uint32_t trec = 400);
@@ -121,10 +131,10 @@ class FRAM
   int8_t   _writeProtectPin = -1;
   TwoWire* _wire;
 
-  uint16_t      _getMetaData(uint8_t id);
+  uint32_t      _getMetaData();
   //  virtual so derived classes FRAM9/11 use their implementation.
-  virtual void  _writeBlock(uint16_t memaddr, uint8_t * obj, uint8_t size);
-  virtual void  _readBlock(uint16_t memaddr, uint8_t * obj, uint8_t size);
+  virtual void  _writeBlock(uint16_t memAddr, uint8_t * obj, uint8_t size);
+  virtual void  _readBlock(uint16_t memAddr, uint8_t * obj, uint8_t size);
 };
 
 
@@ -138,37 +148,40 @@ class FRAM32 : public FRAM
 public:
   FRAM32(TwoWire *wire = &Wire);
 
-  void     write8(uint32_t memaddr, uint8_t value);
-  void     write16(uint32_t memaddr, uint16_t value);
-  void     write32(uint32_t memaddr, uint32_t value);
-  void     write64(uint32_t memaddr, uint64_t value);
-  void     writeFloat(uint32_t memaddr, float value);
-  void     writeDouble(uint32_t memaddr, double value);
-  void     write(uint32_t memaddr, uint8_t * obj, uint16_t size);
-
-  uint8_t  read8(uint32_t memaddr);
-  uint16_t read16(uint32_t memaddr);
-  uint32_t read32(uint32_t memaddr);
-  uint64_t read64(uint32_t memaddr);
-  float    readFloat(uint32_t memaddr);
-  double   readDouble(uint32_t memaddr);
-  void     read(uint32_t memaddr, uint8_t * obj, uint16_t size);
+  void     write8(uint32_t memAddr, uint8_t value);
+  void     write16(uint32_t memAddr, uint16_t value);
+  void     write32(uint32_t memAddr, uint32_t value);
+  void     write64(uint32_t memAddr, uint64_t value);
+  void     writeFloat(uint32_t memAddr, float value);
+  void     writeDouble(uint32_t memAddr, double value);
+  void     write(uint32_t memAddr, uint8_t * obj, uint16_t size);
+
+
+  uint8_t  read8(uint32_t memAddr);
+  uint16_t read16(uint32_t memAddr);
+  uint32_t read32(uint32_t memAddr);
+  uint64_t read64(uint32_t memAddr);
+  float    readFloat(uint32_t memAddr);
+  double   readDouble(uint32_t memAddr);
+  void     read(uint32_t memAddr, uint8_t * obj, uint16_t size);
+
 
   //  readUntil returns length 0.. n of the buffer.
   //  readUntil returns -1 if data does not fit into buffer,
   //  =>  separator not encountered.
-  int32_t readUntil(uint32_t memaddr, char * buf, uint16_t buflen, char separator);
+  int32_t readUntil(uint32_t memAddr, char * buffer, uint16_t bufferLength, char separator);
   //  buffer needs one place for end char '\0'.
-  int32_t readLine(uint32_t memaddr, char * buf, uint16_t buflen);
+  int32_t readLine(uint32_t memAddr, char * buffer, uint16_t bufferLength);
 
-  template <class T> uint32_t writeObject(uint32_t memaddr, T &obj);
-  template <class T> uint32_t readObject(uint32_t memaddr, T &obj);
+  template <class T> uint32_t writeObject(uint32_t memAddr, T &obj);
+  template <class T> uint32_t readObject(uint32_t memAddr, T &obj);
 
   uint32_t clear(uint8_t value = 0);  // fills FRAM with value
 
+
 protected:
-  void     _writeBlock(uint32_t memaddr, uint8_t * obj, uint8_t size);
-  void     _readBlock(uint32_t memaddr, uint8_t * obj, uint8_t size);
+  void     _writeBlock(uint32_t memAddr, uint8_t * obj, uint8_t size);
+  void     _readBlock(uint32_t memAddr, uint8_t * obj, uint8_t size);
 };
 
 
@@ -193,9 +206,10 @@ class FRAM11 : public FRAM
 
   uint16_t getSize();
 
+
 protected:
-  void     _writeBlock(uint16_t memaddr, uint8_t * obj, uint8_t size);
-  void     _readBlock(uint16_t memaddr, uint8_t * obj, uint8_t size);
+  void     _writeBlock(uint16_t memAddr, uint8_t * obj, uint8_t size);
+  void     _readBlock(uint16_t memAddr, uint8_t * obj, uint8_t size);
 };
 
 
@@ -220,9 +234,10 @@ class FRAM9 : public FRAM
 
   uint16_t getSize();
 
+
 protected:
-  void     _writeBlock(uint16_t memaddr, uint8_t * obj, uint8_t size);
-  void     _readBlock(uint16_t memaddr, uint8_t * obj, uint8_t size);
+  void     _writeBlock(uint16_t memAddr, uint8_t * obj, uint8_t size);
+  void     _readBlock(uint16_t memAddr, uint8_t * obj, uint8_t size);
 };
 
 
diff --git a/README.md b/README.md
index 5c34fee..7cdcf54 100644
--- a/README.md
+++ b/README.md
@@ -2,8 +2,11 @@
 [![Arduino CI](https://github.com/RobTillaart/FRAM_I2C/workflows/Arduino%20CI/badge.svg)](https://github.com/marketplace/actions/arduino_ci)
 [![Arduino-lint](https://github.com/RobTillaart/FRAM_I2C/actions/workflows/arduino-lint.yml/badge.svg)](https://github.com/RobTillaart/FRAM_I2C/actions/workflows/arduino-lint.yml)
 [![JSON check](https://github.com/RobTillaart/FRAM_I2C/actions/workflows/jsoncheck.yml/badge.svg)](https://github.com/RobTillaart/FRAM_I2C/actions/workflows/jsoncheck.yml)
+[![GitHub issues](https://img.shields.io/github/issues/RobTillaart/FRAM_I2C.svg)](https://github.com/RobTillaart/FRAM_I2C/issues)
+
 [![License: MIT](https://img.shields.io/badge/license-MIT-green.svg)](https://github.com/RobTillaart/FRAM_I2C/blob/master/LICENSE)
 [![GitHub release](https://img.shields.io/github/release/RobTillaart/FRAM_I2C.svg?maxAge=3600)](https://github.com/RobTillaart/FRAM_I2C/releases)
+[![PlatformIO Registry](https://badges.registry.platformio.org/packages/robtillaart/library/FRAM_I2C.svg)](https://registry.platformio.org/libraries/robtillaart/FRAM_I2C)
 
 
 # FRAM_I2C
@@ -37,7 +40,7 @@ Types of FRAM that should work with this library:
 |  MB85RC04    |    512   |    Y     |  no deviceID register  |  FRAM9   |  #35  |
 |  MB85RC16    |    2 KB  |    Y     |  no deviceID register  |  FRAM11  |  #28  |
 |  MB85RC64T   |    8 KB  |    Y     |                        |  FRAM    |       |
-|  MB85RC64V   |    8 KB  |    Y     |  no deviceID register  |  FRAM    |       |
+|  MB85RC64V   |    8 KB  |    Y     |  no deviceID register  |  FRAM    |  #38  |
 |  MB85RC128A  |   16 KB  |    N     |  no deviceID register  |  FRAM    |       |
 |  MB85RC256V  |   32 KB  |    Y     |                        |  FRAM    |       |
 |  MB85RC512T  |   64 KB  |    Y     |                        |  FRAM    |       |
@@ -92,25 +95,25 @@ Note the **MB85RC1MT** only uses even addresses.
 ### Write & read
 
 Support for basic types and two calls for generic objects, use casting if needed.  
-In the **FRAM32** class these functions have an **uin32_t memaddr**.
-
-- **void write8(uint16_t memaddr, uint8_t value)** uint8_t
-- **void write16(uint16_t memaddr, uint16_t value)** uint16_t
-- **void write32(uint16_t memaddr, uint32_t value)** uint32_t
-- **void write64(uint16_t memaddr, uint64_t value)** uint64_t
-- **void writeFloat(uint16_t memaddr, float value)** float
-- **void writeDouble(uint16_t memaddr, double value)** double
+In the **FRAM32** class these functions have an **uin32_t memAddr**.
+
+- **void write8(uint16_t memAddr, uint8_t value)** uint8_t
+- **void write16(uint16_t memAddr, uint16_t value)** uint16_t
+- **void write32(uint16_t memAddr, uint32_t value)** uint32_t
+- **void write64(uint16_t memAddr, uint64_t value)** uint64_t
+- **void writeFloat(uint16_t memAddr, float value)** float
+- **void writeDouble(uint16_t memAddr, double value)** double
   - For boards that have an 8 byte double.
-- **void write(uint16_t memaddr, uint8_t \* obj, uint16_t size)** other types / sizes.
-  - typical used for structs.
-- **uint8_t read8(uint16_t memaddr)**
-- **uint16_t read16(uint16_t memaddr)**
-- **uint32_t read32(uint16_t memaddr)**
-- **uint64_t read64(uint16_t memaddr)**
-- **float readFloat(uint16_t memaddr)**
-- **double readDouble(uint16_t memaddr)**
+- **void write(uint16_t memAddr, uint8_t \* obj, uint16_t size)** other types / sizes.
+  - typical used for structs or text.
+- **uint8_t read8(uint16_t memAddr)**
+- **uint16_t read16(uint16_t memAddr)**
+- **uint32_t read32(uint16_t memAddr)**
+- **uint64_t read64(uint16_t memAddr)**
+- **float readFloat(uint16_t memAddr)**
+- **double readDouble(uint16_t memAddr)**
   - For board that have 8 byte double.
-- **void read(uint16_t memaddr, uint8_t uint8_t \* obj, uint16_t size)**
+- **void read(uint16_t memAddr, uint8_t uint8_t \* obj, uint16_t size)**
   - One needs to allocate memory as the function won't.
 - **uint32_t clear(uint8_t value = 0)** clears the whole FRAM by writing value to all addresses
   - default value is all zero's.
@@ -119,26 +122,26 @@ In the **FRAM32** class these functions have an **uin32_t memaddr**.
 
 
 (Template functions, see issue #13)
-- **uint16_t writeObject(uint16_t memaddr, T &obj)** writes an object to memaddr (and following bytes).
-  - Returns memaddr + sizeof(obj) to get the next address to write to.
-- **uint16_t readObject(uint16_t memaddr, T &obj)** reads an object from memaddr and next bytes.
-  - Returns memaddr + sizeof(obj) to get the next address to read from.
+- **uint16_t writeObject(uint16_t memAddr, T &obj)** writes an object to memAddr (and following bytes).
+  - Returns memAddr + sizeof(obj) to get the next address to write to.
+- **uint16_t readObject(uint16_t memAddr, T &obj)** reads an object from memAddr and next bytes.
+  - Returns memAddr + sizeof(obj) to get the next address to read from.
 
 
 (Experimental 0.5.1, see issue #30)
-- **int32_t readUntil(uint16_t memaddr, char \*buf, uint16_t buflen, char separator)**
-Reads FRAM from an address into **buf** until separator is encountered.
+- **int32_t readUntil(uint16_t memAddr, char \* buffer, uint16_t bufferLength, char separator)**
+Reads FRAM from an address into **buffer** until separator is encountered.
 The separator is replaced by an '\0' - end of char array.
 **ReadUntil()** returns the length of the buffer.
-To get the address of the next "field" one must add ```memaddr += (length + 1)```.  
-If the separator is not found after **buflen** characters the function returns -1.
+To get the address of the next "field" one must add ```memAddr += (length + 1)```.  
+If the separator is not found after **bufferLength** characters the function returns -1.
 However the buffer does contain the data read, which might be useful. 
 Handle with care as buffer has probably no '\0' end char.
-- **int32_t readLine(uint16_t memaddr, char \* buf, uint16_t buflen)**
+- **int32_t readLine(uint16_t memAddr, char \* buffer, uint16_t bufferLength)**
 Similar to **readUntil()**, reads a line from FRAM including the '\n'.
 This '\n' is mandatory as end separator!.  
 Note: The buffer needs one extra char for the delimiting '\0' end char.
-To get the address of the next "field" one must add ```memaddr += length```.
+To get the address of the next "field" one must add ```memAddr += length```.
 This is an minor but important difference with **readUntil()**.
 Note: the returning buffer contains the '\n' so one need to take care when
 printing the buffer.
@@ -148,10 +151,10 @@ printing the buffer.
 
 **readUntil()** can be used to read lines and/or fields from an FRAM filled with text.
 For example logging written with the FRAM_logging.ino example.
-Note: if memaddr + buflen >= size of FRAM, memory wrapping may occur.
+Note: if memAddr + bufferLength >= size of FRAM, memory wrapping may occur.
 The library does not check, so the user should.
 
-Note: internally **readUntil()** reads buflen bytes to fill the buffer.
+Note: internally **readUntil()** reads bufferLength bytes to fill the buffer.
 Then it searches for the separator. 
 This is chosen to optimize performance for relative small buffers that are used most.
 For large buffers this fetching of the whole buffer will take much time.
@@ -181,7 +184,9 @@ These may not work for devices that have no **deviceID** register.
 So use with care.
 
 - **uint16_t getManufacturerID()** see table below.
+Returns 0x0FFF means **getMetaData()** had a read error.
 - **uint16_t getProductID()** idem. Proprietary.
+Returns 0x0FFF means **getMetaData()** had a read error.
 - **uint16_t getSize()** returns the size in kiloBYTE.
 If the FRAM has no device ID register, the size cannot be read.
   - FRAM9 will return 0 as it is less than 1 KB. use GetSizeBytes() instead.
@@ -198,12 +203,13 @@ if the FRAM is used only partial.
 
 ### Manufacturers ID
 
-|  Name                 |  ID     |
-|:----------------------|:-------:|
-|  Fujitsu              |  0x00A  |
-|  Ramtron              |  0x004  |
+|  Name                    |  ID     |  Notes  |
+|:-------------------------|:-------:|:--------|
+|  Fujitsu                 |  0x00A  |
+|  Ramtron                 |  0x004  |
+|  getMetaData read error  |  0xFFF  |  See #38  
 
-Additions are welcome.
+Additions for manufacturers ID's are welcome.
 
 
 ### Sleep
@@ -313,13 +319,7 @@ Use **getSizeBytes()** to get 512.
     - a wrapper class?
 - fill power usage table (documentation)
   - is in data sheet.
-- refactor for readability
-  - improve / add comments where needed.
-  - memaddr ==> memoryAddress or memAddr (camelCase)
-  - buf ==> buffer, 
-  - buflen ==> bufferLength / bufferSize
-  - obj ==> object 
-  - use SDA/SCL as name
+- improve comments where needed.
 
 
 #### Wont
@@ -332,6 +332,15 @@ Use **getSizeBytes()** to get 512.
   - Print interface? expensive in performance per char..
   - see example **FRAM_hexdump.ino**
 - remember last written address? why?
-- do we need a **write(memaddr, char \* buf)** for completeness?
+- do we need a **write(memAddr, char \* buffer)** for completeness?
   - it is just a wrapper
 
+
+## Support
+
+If you appreciate my libraries, you can support the development and maintenance.
+Improve the quality of the libraries by providing issues and Pull Requests, or
+donate through PayPal or GitHub sponsors.
+
+Thank you,
+
diff --git a/keywords.txt b/keywords.txt
index f0e2ba3..1743d3b 100644
--- a/keywords.txt
+++ b/keywords.txt
@@ -16,6 +16,7 @@ isConnected	KEYWORD2
 write8	KEYWORD2
 write16	KEYWORD2
 write32	KEYWORD2
+write64	KEYWORD2
 writeFloat	KEYWORD2
 writeDouble	KEYWORD2
 write	KEYWORD2
@@ -23,6 +24,7 @@ write	KEYWORD2
 read8	KEYWORD2
 read16	KEYWORD2
 read32	KEYWORD2
+read64	KEYWORD2
 readFloat	KEYWORD2
 readDouble	KEYWORD2
 read	KEYWORD2
@@ -93,6 +95,7 @@ FRAM_ERROR_CONNECT	LITERAL1
 FRAM_MB85RC04	LITERAL1
 FRAM_MB85RC16	LITERAL1
 FRAM_MB85RC64T	LITERAL1
+FRAM_MB85RC64V	LITERAL1
 FRAM_MB85RC128A	LITERAL1
 FRAM_MB85RC256V	LITERAL1
 FRAM_MB85RC512T	LITERAL1
diff --git a/library.json b/library.json
index ced6ec4..e01c18a 100644
--- a/library.json
+++ b/library.json
@@ -15,9 +15,9 @@
     "type": "git",
     "url": "https://github.com/RobTillaart/FRAM_I2C.git"
   },
-  "version": "0.5.3",
+  "version": "0.5.4",
   "license": "MIT",
-  "frameworks": "arduino",
+  "frameworks": "*",
   "platforms": "*",
   "headers": "FRAM.h"
 }
diff --git a/library.properties b/library.properties
index d123b35..90e9aaf 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=FRAM_I2C
-version=0.5.3
+version=0.5.4
 author=Rob Tillaart <rob.tillaart@gmail.com>
 maintainer=Rob Tillaart <rob.tillaart@gmail.com>
 sentence=Arduino library for I2C FRAM for persistent storage.
diff --git a/test/unit_test_001.cpp b/test/unit_test_001.cpp
index f3b6f64..94397dd 100644
--- a/test/unit_test_001.cpp
+++ b/test/unit_test_001.cpp
@@ -49,6 +49,7 @@ unittest(test_constants)
   assertEqual(512,    FRAM_MB85RC04  );
   assertEqual(2048,   FRAM_MB85RC16  );
   assertEqual(8192,   FRAM_MB85RC64T );
+  assertEqual(8192,   FRAM_MB85RC64V );
   assertEqual(16384,  FRAM_MB85RC128A);
   assertEqual(32768,  FRAM_MB85RC256V);
   assertEqual(65536,  FRAM_MB85RC512T);
@@ -84,8 +85,8 @@ unittest(test_constructor)
   assertFalse(fram57.getWriteProtect());
 
   fprintf(stderr, "\n all fail as nothing connected\n");
-  assertEqual(65535, fram50.getManufacturerID());
-  assertEqual(65535, fram50.getProductID());
+  assertEqual(0xFFF, fram50.getManufacturerID());
+  assertEqual(0xFFF, fram50.getProductID());
   assertEqual(0, fram50.getSize());
 }
 
@@ -100,6 +101,11 @@ unittest(test_getSizeBytes)
   fram.setSizeBytes(FRAM_MB85RC256V);
   assertEqual(32768, fram.getSizeBytes());
 
+  FRAM32 f32;
+  assertEqual(0, f32.getSizeBytes());
+  f32.setSizeBytes(FRAM_MB85RC1MT);
+  assertEqual(131072, f32.getSizeBytes());
+
   FRAM11 f11;
   assertEqual(2, f11.getSize());
   assertEqual(2048, f11.getSizeBytes());