diff --git a/src/Code_LEDLock.cpp b/src/Code_LEDLock.cpp
index a8217ce..c5c502d 100644
--- a/src/Code_LEDLock.cpp
+++ b/src/Code_LEDLock.cpp
@@ -59,7 +59,7 @@ This debug code prints "keyboard_leds=0" when scrollLock is pressed:
 */
     if (keyboard_leds & USB_LED_bit)            //if USB_LED_bit is set
     {
-        refLED.off();                      //LED on/off seem inverted, but it works for active high
+        refLED.off();                      //LED on-off seem inverted, but it works for active high
     }
     else
     {
diff --git a/src/RowPort_PCA9655E.cpp b/src/RowPort_PCA9655E.cpp
index cddd20e..78b843d 100644
--- a/src/RowPort_PCA9655E.cpp
+++ b/src/RowPort_PCA9655E.cpp
@@ -4,8 +4,7 @@
 configures column port's configuration and output.
 */
 RowPort_PCA9655E::RowPort_PCA9655E(IOExpanderPort& port)
-    : port(port), configurationByteCommand(port.num + 6), outputByteCommand(port.num + 2)
-{}
+    : port(port), configurationByteCommand(port.num + 6), outputByteCommand(port.num + 2) {}
 
 void RowPort_PCA9655E::begin()
 {
diff --git a/src/Row_IOE.cpp b/src/Row_IOE.cpp
deleted file mode 100644
index ec89989..0000000
--- a/src/Row_IOE.cpp
+++ /dev/null
@@ -1,59 +0,0 @@
-#include "Row_IOE.h"
-
-void Row_IOE::process()
-{
-    //these variables are all bitwise, one bit per key
-    uint8_t rowState;                       //1 means pressed, 0 means released
-    //read_pins_mask_t rowEnd;                    //1 bit marks positioned after last key of row
-    uint8_t debouncedChanged;               //1 means debounced changed
-    ColPort* ptrColPort; //new
-    uint8_t KEY_COUNT; //new
-
-    ptrColPort = scanner.scan();
-    rowState = getRowState(ptrColPort, KEY_COUNT); //new
-    debouncedChanged = debouncer.debounce(rowState, debounced);
-    pressRelease(KEY_COUNT, debouncedChanged);
-}
-
-/*
-Copies column pins to rowState.  Unused column pins are not copied.
-Sets rowEnd and returns rowState.
-rowEnd is a bitwise row mask, one col per bit, where active col bit is 1.
-At end of function, 1 bit marks place immediatly after last key of row.
-rowEnd is a larger type than portMask so that it can not overflow.
-*/
-uint8_t Row_IOE::getRowState(ColPort* ptrColPort, uint8_t& KEY_COUNT)
-{
-    uint8_t rowState = 0;           //bitwise, one key per bit, 1 means key is pressed
-    uint8_t portMask;               //bitwise, 1 bit is a colPortState position
-    uint8_t rowEnd;                    //1 bit marks positioned after last key of row todo rename
-
-    KEY_COUNT = 0;
-
-    //bitwise colPins, 1 means pin is connected to column
-    uint8_t colPins = ptrColPort->getColPins();
-
-    //bitwise colPortState, pin values where set in ColPort::read(), get them now
-    uint8_t colPortState = ptrColPort->getPortState();
-
-    /*if (activeHigh) //'activeHigh' was not declared in this scope
-    {
-        colPortState = ~colPortState; //todo configure IOE polarity to take care of this
-    }*/
-
-    for ( portMask = 1; portMask > 0; portMask <<= 1 ) //shift portMask until overflow
-    {                                       //for each pin of col port
-        if (portMask & colPins)             //if pin is connected to column
-        {
-            if (portMask & ~colPortState)   //if pin detected a key press
-            {
-                rowState |= rowEnd;         //set rowState bit for that key
-            }
-
-            rowEnd <<= 1;                   //shift rowEnd to next key
-            KEY_COUNT++;
-        }
-    }
-
-    return rowState;
-}
diff --git a/src/Row_IOE.h b/src/Row_IOE.h
deleted file mode 100644
index 440a804..0000000
--- a/src/Row_IOE.h
+++ /dev/null
@@ -1,47 +0,0 @@
-#ifndef ROWIOE_H
-#define ROWIOE_H
-
-#include <RowBase.h>
-#include <RowScanner_PinsBitwise.h>
-#include <Debouncer_4Samples.h>
-#include <ColPort.h>
-
-/* Row_DH_IOE is a row connected to an Input/Output Expander.
-
-Instantiation
--------------
-Definition of DELAY_MICROSECONDS is explained in RowBase.cpp.
-Definition of activeHigh is explained in RowScanner_Interface.h
-Example instantiation of a row:
-
-    const unsigned int RowBase::DELAY_MICROSECONDS = 1000;
-    const bool RowScanner_PinsArray::activeHigh = 0;
-
-    const uint8_t IOExpanderPort::ADDR = 0x18;
-
-    IOExpanderPort port1(1, 0);
-    RowPort_PCA9655E rowPort1(port1);
-
-    IOExpanderPort port0(0, 0);
-    ColPort_PCA9655E colPort0(port0, 1<<0 | 1<<1 | 1<<2 | 1<<3 | 1<<4 | 1<<5 );
-
-    Key* const ptrsKeys_0[] = { &k_00, &k_01, &k_02, &k_03, &k_04, &k_05 };
-    Row_IOE row_0(rowPort1, 1<<0, colPort0, ptrsKeys_0);
-
-Number of pins in colPort0 should equal number of keys in ptrsKeys_0[] array.
-    if a pin is missing, a key will be unresposive
-    if a Key pointer is missing, the keyboard will fail in an unprdictable way
-*/
-class Row_IOE : public RowBase
-{
-    private:
-        RowScanner_PinsBitwise scanner;
-        Debouncer_4Samples debouncer;
-    public:
-        Row_IOE( RowPort& refRowPort, const uint8_t strobePin,
-             ColPort& refColPort, Key *const ptrsKeys[], const uint8_t KEY_COUNT) //todo if KEY_COUNT is passed in, store it in private
-            : RowBase(ptrsKeys), scanner(refRowPort, strobePin, refColPort) { }
-        void process();
-        uint8_t getRowState(ColPort* ptrColPort, uint8_t& KEY_COUNT);
-};
-#endif