diff --git a/lib/read.cs.js b/lib/read.cs.js
index fa843d2..cf1b2cd 100644
--- a/lib/read.cs.js
+++ b/lib/read.cs.js
@@ -3,34 +3,42 @@
 var
   FSO_ForReading = 1, FSO_ForWriting = 2,
 
-  fso, tty, shell,
+  fso, tty,
   args =// Array.prototype.slice.call(WScript.Arguments),
     (function() {
       var args = [], i, iLen;
-      for (i = 0, iLen = WScript.Arguments.length; i < iLen; i++) {
-        args.push(WScript.Arguments(i));
-      }
+      for (i = 0, iLen = WScript.Arguments.length; i < iLen; i++)
+        { args.push(WScript.Arguments(i)); }
       return args;
     })(),
   arg, options = {};
 
 while (typeof(arg = args.shift()) === 'string') {
-  if (arg === '--noechoback') {
+  arg = arg.toLowerCase();
+  if (arg === '--display') {
+    options.display = args.shift();
+  } else if (arg === '--noechoback') {
     options.noEchoBack = true;
+  } else if (arg === '--mask') {
+    options.mask = args.shift();
   } else if (arg === '--keyin') {
     options.keyIn = true;
-  } else if (arg === '--display') {
-    options.display = args.shift();
   } else if (arg === '--encoded') {
     options.encoded = true;
   }
 }
 
-if (typeof options.display === 'string' && options.display !== '') {
-  writeTTY(options.encoded ? decodeDOS(options.display) : options.display);
+if (options.encoded) {
+  if (typeof options.display === 'string')
+    { options.display = decodeDOS(options.display); }
+  if (typeof options.mask === 'string')
+    { options.mask = decodeDOS(options.mask); }
 }
 
-WScript.StdOut.Write("'" + (options.noEchoBack ? readS() : readTTY()) + "'");
+if (typeof options.display === 'string' && options.display !== '')
+  { writeTTY(options.display); }
+
+WScript.StdOut.Write("'" + readTTY() + "'");
 
 WScript.Quit();
 
@@ -46,6 +54,27 @@ function writeTTY(text) {
 }
 
 function readTTY() {
+
+  // function psExists() {
+  //   var envPs = getShell().Environment('System')('PSModulePath');
+  //   return typeof envPs === 'string' && envPs !== '';
+  // }
+
+  if (!options.noEchoBack && !options.keyIn) {
+    return readByCS();
+  // } else if (psExists()) {
+  //   return readByPS();
+  } else if (options.noEchoBack && !options.keyIn && options.mask === '*') {
+    return readByPW();
+  } else {
+    WScript.StdErr.WriteLine('Microsoft Windows PowerShell is required.\n' +
+      'https://technet.microsoft.com/ja-jp/library/hh847837.aspx');
+    WScript.Quit(1);
+  }
+}
+
+function readByCS() {
+  WScript.StdErr.Write('<<readByCS>>'); //_DBG_
   var text;
   try {
     text = getFso().OpenTextFile('CONIN$', FSO_ForReading).ReadLine();
@@ -57,32 +86,8 @@ function readTTY() {
   return text;
 }
 
-function readS() {
-  var pw;
-  // Microsoft Windows PowerShell https://technet.microsoft.com/ja-jp/library/hh847837.aspx
-  shellExec('powershell /?', function(exitCode, stdout, stderr, error) {
-    if (error || exitCode !== 0) {
-      pw = scriptPW();
-    } else {
-      shellExec('powershell -Command "$text = Read-Host -AsSecureString;' +
-          '$BSTR = [System.Runtime.InteropServices.Marshal]::SecureStringToBSTR($text);' +
-          '[System.Runtime.InteropServices.Marshal]::PtrToStringAuto($BSTR)"',
-        function(exitCode, stdout, stderr, error) {
-          if (error || exitCode !== 0) {
-            WScript.StdErr.WriteLine('Windows PowerShell Error: ' + exitCode +
-              (error && error.description ? '\n' + error.description : '') +
-              (stderr ? '\n' + stderr : '') +
-              (stdout ? '\n' + stdout : ''));
-            WScript.Quit(1);
-          }
-          pw = stdout.replace(/[\r\n]+$/, '');
-        });
-    }
-  });
-  return pw;
-}
-
-function scriptPW() {
+function readByPW() {
+  WScript.StdErr.Write('<<readByPW>>'); //_DBG_
   var pw;
   // exit-code is not returned even if an error is thrown.
   try {
@@ -107,43 +112,9 @@ function getFso() {
   return fso;
 }
 
-function getShell() {
-  if (!shell) { shell = WScript.CreateObject('WScript.Shell'); }
-  return shell;
-}
-
-function shellExec(cmd, callback) { // callback(exitCode, stdout, stderr, error)
-  var wsExec, stdout = '', stderr = '', noOutput;
-
-  try {
-    wsExec = getShell().Exec(cmd);
-  } catch (e) {
-    callback(e.number, stdout, stderr, e);
-    return wsExec;
-  }
-
-  while (true) {
-    noOutput = true;
-    if (!wsExec.StdOut.AtEndOfStream) {
-      stdout += wsExec.StdOut.ReadAll();
-      noOutput = false;
-    }
-    if (!wsExec.StdErr.AtEndOfStream) {
-      stderr += wsExec.StdErr.ReadAll();
-      noOutput = false;
-    }
-    if (noOutput) {
-      if (wsExec.Status === 1 /*WshFinished*/) { break; }
-      WScript.Sleep(100);
-    }
-  }
-
-  callback(wsExec.ExitCode, stdout, stderr);
-  return wsExec;
-}
-
 function decodeDOS(arg) {
-  return (arg + '').replace(/#(\d+);/g, function(str, charCode) {
+  return arg.replace(/#(\d+);/g, function(str, charCode) {
     return String.fromCharCode(+charCode);
   });
 }
+
diff --git a/lib/read.ps1 b/lib/read.ps1
new file mode 100644
index 0000000..c281dd2
--- /dev/null
+++ b/lib/read.ps1
@@ -0,0 +1,93 @@
+
+Param(
+  [string] $display,
+  [switch] $noEchoBack,
+  [string] $mask = '*',
+  [switch] $keyIn,
+  [switch] $encoded
+)
+
+$ErrorActionPreference = 'Stop' # for cmdlet
+trap {
+  # `throw $_` and `Write-Error $_` return exit-code 0
+  $Host.UI.WriteErrorLine($_)
+  exit 1
+}
+
+function decodeDOS($arg) {
+  [Regex]::Replace($arg, '#(\d+);', { [char][int] $args[0].Groups[1].Value })
+}
+
+if ($encoded) {
+  if ($display -ne '') { $display = decodeDOS $display }
+  if ($mask -ne '') { $mask = decodeDOS $mask }
+}
+
+Write-Warning "[PS] display:     <$display>" #_DBG
+Write-Warning "[PS] noEchoBack:  $noEchoBack" #_DBG
+Write-Warning "[PS] mask:        <$mask>" #_DBG
+Write-Warning "[PS] keyIn:       $keyIn" #_DBG
+
+# Instant method that opens TTY without CreateFile via P/Invoke in .NET Framework
+# **NOTE** Don't include special characters in $command when $getRes is True.
+function execWithTTY ($command, $getRes = $False) {
+  Write-Warning "[PS] command: <$command> getRes: $getRes" #_DBG
+  if ($getRes) {
+    $res = (cmd.exe /C "<CON powershell.exe -Command $command")
+    if ($LastExitCode -ne 0) { exit 1 }
+  } else {
+    $command | cmd.exe /C ">CON powershell.exe -Command -"
+    if ($LastExitCode -ne 0) { exit 1 }
+    $res = ''
+  }
+  return $res
+}
+
+function writeTTY ($text) {
+  execWithTTY ('Write-Host ''' + ($text -replace '''', '''''') + ''' -NoNewline')
+}
+
+[string] $inputTTY = ''
+
+if ($noEchoBack -and (-not $keyIn) -and ($mask -eq '*')) {
+  $inputTTY = execWithTTY ('$inputTTY = Read-Host -AsSecureString;' +
+    '$bstr = [System.Runtime.InteropServices.Marshal]::SecureStringToBSTR($inputTTY);' +
+    '[System.Runtime.InteropServices.Marshal]::PtrToStringAuto($bstr)') $True
+  return $inputTTY
+}
+
+$isEditable = (-not $noEchoBack) -and (-not $keyIn)
+if ($keyIn) { $reqSize = 1 }
+else { $reqSize = 1024 } # dummy
+
+while ($True) {
+  if ($isEditable) {
+    $chunk = execWithTTY 'Read-Host' $True
+    $chunk += "`n"
+  } else { # raw
+    $chunk = execWithTTY '[System.Console]::ReadKey($True).KeyChar' $True
+  }
+
+  if ($chunk -eq '') { break }
+  $chunk = $chunk -replace '[\x00-\x08\x0b\x0c\x0e-\x1f\x7f]', ''
+  if ($chunk -eq '') { continue }
+
+  if (-not $isEditable) {
+    $displayInput = $chunk -replace '[\r\n]', ''
+    if ($displayInput -ne '') {
+      if ($noEchoBack) {
+        if ($mask -eq '') { $displayInput = '' }
+        else { $displayInput = $displayInput -replace '.', $mask }
+      }
+      if ($displayInput -ne '') { writeTTY $displayInput }
+    }
+  }
+
+  $inputTTY += $chunk
+  if (($inputTTY -match '[\r\n]$') -or ($keyIn -and ($inputTTY.Length -ge $reqSize)))
+    { break }
+}
+
+if (-not $isEditable) { writeTTY "`n" } # new-line
+
+return '''' + $inputTTY + '''' #DBG
diff --git a/lib/readline-sync.js b/lib/readline-sync.js
index b37e9c4..1526020 100644
--- a/lib/readline-sync.js
+++ b/lib/readline-sync.js
@@ -27,10 +27,10 @@ var
   useExt = false,
 
   fdR = 'none', fdW, ttyR, isRawMode = false,
-  extHostPath,   extScriptPath, tempdir, salt = 0;
+  extHostPath, extScriptPath, tempdir, salt = 0;
 
 function readlineSync(options) { // display, mask are string
-  var input = '', isEditable, displayInput;
+  var input = '', displayTmp;
 
   function tryExt() {
     var res = readlineExt(options);
@@ -38,14 +38,6 @@ function readlineSync(options) { // display, mask are string
     return res.input;
   }
 
-  // Node v0.10- returns an error if same mode is set.
-  function setRawMode(mode) {
-    if (mode === isRawMode) { return true; }
-    if (ttyR.setRawMode(mode) !== 0) { return false; }
-    isRawMode = mode;
-    return true;
-  }
-
   (function() {
     var fsB, constants;
 
@@ -114,10 +106,22 @@ function readlineSync(options) { // display, mask are string
   if (options.display !== '' && typeof print === 'function')
     { print(options.display, encoding); }
 
-  isEditable = !options.noEchoBack && !options.keyIn;
-
   (function() { // try read
-    var buffer, reqSize, readSize, chunk;
+    var buffer, reqSize, readSize, chunk, isInputLine = false,
+      isEditable = !options.noEchoBack && !options.keyIn;
+
+    function writeTTY(text) {
+      fs.writeSync(fdW, text);
+      isInputLine = true;
+    }
+
+    // Node v0.10- returns an error if same mode is set.
+    function setRawMode(mode) {
+      if (mode === isRawMode) { return true; }
+      if (ttyR.setRawMode(mode) !== 0) { return false; }
+      isRawMode = mode;
+      return true;
+    }
 
     if (useExt || !ttyR ||
         typeof fdW !== 'number' && (options.display !== '' || !isEditable)) {
@@ -126,7 +130,7 @@ function readlineSync(options) { // display, mask are string
     }
 
     if (options.display !== '') {
-      fs.writeSync(fdW, options.display);
+      writeTTY(options.display);
       options.display = '';
     }
 
@@ -154,12 +158,12 @@ function readlineSync(options) { // display, mask are string
       if ((chunk = chunk.replace(/[\x00-\x08\x0b\x0c\x0e-\x1f\x7f]/g, '')) === '')
         { continue; }
 
-      if (!isEditable && (displayInput = chunk.replace(/[\r\n]/g, '')) !== '') {
+      if (!isEditable && (displayTmp = chunk.replace(/[\r\n]/g, '')) !== '') {
         if (options.noEchoBack) {
-          displayInput = options.mask === '' ? '' :
-            (new Array(displayInput.length + 1)).join(options.mask);
+          displayTmp = options.mask === '' ? '' :
+            (new Array(displayTmp.length + 1)).join(options.mask);
         }
-        if (displayInput !== '') { fs.writeSync(fdW, displayInput); }
+        if (displayTmp !== '') { writeTTY(displayTmp); }
       }
 
       input += chunk;
@@ -167,14 +171,14 @@ function readlineSync(options) { // display, mask are string
         options.keyIn && input.length >= reqSize) { break; }
     }
 
-    if (!isEditable) { fs.writeSync(fdW, '\n'); }
+    if (!isEditable && !(options.keyIn && !isInputLine)) { writeTTY('\n'); }
     setRawMode(false);
   })();
 
   if (typeof print === 'function') {
-    displayInput = input.replace(/[\r\n]/g, '');
+    displayTmp = input.replace(/[\r\n]/g, '');
     print((options.noEchoBack ?
-        (new Array(displayInput.length + 1)).join(options.mask) : displayInput) +
+        (new Array(displayTmp.length + 1)).join(options.mask) : displayTmp) +
       '\n', encoding);
   }