diff --git a/libraries/DEVFULL/.arduino-ci.yml b/libraries/DEVFULL/.arduino-ci.yml
index fa920b20..77a333f9 100644
--- a/libraries/DEVFULL/.arduino-ci.yml
+++ b/libraries/DEVFULL/.arduino-ci.yml
@@ -1,11 +1,28 @@
+platforms:
+  rpipico:
+    board: rp2040:rp2040:rpipico
+    package: rp2040:rp2040
+    gcc:
+      features:
+      defines:
+        - ARDUINO_ARCH_RP2040
+      warnings:
+      flags:
+
+packages:
+  rp2040:rp2040:
+    url: https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json
+
 compile:
   # Choosing to run compilation tests on 2 different Arduino platforms
   platforms:
     - uno
-    - due
-    - zero
-    - leonardo
+    # - due
+    # - zero
+    # - leonardo
     - m4
     - esp32
     - esp8266
-    - mega2560
\ No newline at end of file
+    # - mega2560
+    - rpipico
+
diff --git a/libraries/DEVFULL/CHANGELOG.md b/libraries/DEVFULL/CHANGELOG.md
new file mode 100644
index 00000000..86a30d8a
--- /dev/null
+++ b/libraries/DEVFULL/CHANGELOG.md
@@ -0,0 +1,18 @@
+# Change Log DEVFULL
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/)
+and this project adheres to [Semantic Versioning](http://semver.org/).
+
+
+## [0.1.2] - 2022-10-31
+- add changelog.md
+- add rp2040 to build-CI
+
+## [0.1.1] - 2022-07-01
+- add limits.h INT_MAX to support 32 bit int.
+
+## [0.1.0] - 2022-03-11
+- initial version
+
diff --git a/libraries/DEVFULL/DEVFULL.h b/libraries/DEVFULL/DEVFULL.h
index 48c1014b..f7feffea 100644
--- a/libraries/DEVFULL/DEVFULL.h
+++ b/libraries/DEVFULL/DEVFULL.h
@@ -2,21 +2,18 @@
 //
 //    FILE: DEVFULL.h
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.1.1
+// VERSION: 0.1.2
 // PURPOSE: Arduino library for a /dev/full stream - useful for testing / debugging.
 //     URL: https://github.com/RobTillaart/DEVFULL
 //
-// HISTORY:
-//  0.1.0   2022-03-11  initial version.
-//  0.1.1   2022-07-01  add limits.h INT_MAX to support 32 bit int.
-
+// HISTORY: see changelog.md
 
 
 #include "Arduino.h"
 #include "limits.h"
 
 
-#define DEVFULL_LIB_VERSION     (F("0.1.1"))
+#define DEVFULL_LIB_VERSION     (F("0.1.2"))
 
 
 #ifndef ENOSPC
@@ -34,23 +31,23 @@ class DEVFULL : public Stream
 public:
   DEVFULL()
   {
-    setTimeout(0);     // no timeout.
+    setTimeout(0);     //  no timeout.
   };
 
   int  available() { return INT_MAX; };
   int  peek()      { return 0; };
   int  read()      { return 0; };
-  void flush()     { return; };   // placeholder to keep build CI happy
+  void flush()     { return; };   //  placeholder to keep build CI happy
 
   size_t write(const uint8_t data)
   {
-    dummy = data;                 // keep compiler happy
+    dummy = data;                 //  keep compiler happy
     return -28;
   };
 
   size_t write( const uint8_t *buffer, size_t size)
   {
-    dummy = buffer[size-1];       // keep compiler happy
+    dummy = buffer[size-1];       //  keep compiler happy
     return -28;
   };
 
diff --git a/libraries/DEVFULL/README.md b/libraries/DEVFULL/README.md
index 1a9372cc..9d3a053a 100644
--- a/libraries/DEVFULL/README.md
+++ b/libraries/DEVFULL/README.md
@@ -23,12 +23,6 @@ This causes a return value of n x -28 ==> mostly a number in the 65xxx range
 See - https://en.wikipedia.org/wiki//dev/full
 
 
-## Versions
-
-- 0.1.0 is a minimal implementation.
-- 0.1.1 implements INT_MAX
-
-
 ## Interface
 
 - **DEVFULL()** constructor, sets the timeout to zero.
@@ -62,4 +56,3 @@ See examples.
 - improve code
   - test different platforms.
 
-
diff --git a/libraries/DEVFULL/examples/DEVFULL_performance/DEVFULL_performance.ino b/libraries/DEVFULL/examples/DEVFULL_performance/DEVFULL_performance.ino
index 7f8ca0a7..9e9e4a54 100644
--- a/libraries/DEVFULL/examples/DEVFULL_performance/DEVFULL_performance.ino
+++ b/libraries/DEVFULL/examples/DEVFULL_performance/DEVFULL_performance.ino
@@ -3,7 +3,7 @@
 //  AUTHOR: Rob Tillaart
 // PURPOSE: demo
 //
-// this shows that a print can be split up in many  write calls
+// this shows that a print can be split up in many write calls
 // that all return -28. Print will add these together.
 // (is a limit of the Arduino environment)
 
diff --git a/libraries/DEVFULL/examples/DEVFULL_performance/performance_0.1.2.txt b/libraries/DEVFULL/examples/DEVFULL_performance/performance_0.1.2.txt
new file mode 100644
index 00000000..5727b20a
--- /dev/null
+++ b/libraries/DEVFULL/examples/DEVFULL_performance/performance_0.1.2.txt
@@ -0,0 +1,15 @@
+// test run on IDE 1.8.19 UNO
+// test run while working on improvements for 0.1.2)
+
+DEVFULL_performance.ino
+DEVFULL_LIB_VERSION: 0.1.2
+PRINTLN: 	20	2
+WRITE: 		4	1
+long: 		356	1
+float0: 	64	1
+float1: 	596	7
+float2: 	1096	12
+float3: 	1612	17
+float4: 	2116	22
+
+
diff --git a/libraries/DEVFULL/library.json b/libraries/DEVFULL/library.json
index ecce91ee..510c5c72 100644
--- a/libraries/DEVFULL/library.json
+++ b/libraries/DEVFULL/library.json
@@ -15,7 +15,7 @@
     "type": "git",
     "url": "https://github.com/RobTillaart/DEVFULL.git"
   },
-  "version": "0.1.1",
+  "version": "0.1.2",
   "license": "MIT",
   "frameworks": "arduino",
   "platforms": "*",
diff --git a/libraries/DEVFULL/library.properties b/libraries/DEVFULL/library.properties
index 852c6d2c..d0ef5ac3 100644
--- a/libraries/DEVFULL/library.properties
+++ b/libraries/DEVFULL/library.properties
@@ -1,5 +1,5 @@
 name=DEVFULL
-version=0.1.1
+version=0.1.2
 author=Rob Tillaart <rob.tillaart@gmail.com>
 maintainer=Rob Tillaart <rob.tillaart@gmail.com>
 sentence=Arduino library for a /dev/full stream